JP2008095861A - Vibration control bush and link member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration control bush capable of sufficiently reducing a twisting directional spring constant and increasing an axial spring constant. <P>SOLUTION: In the vibration control bush 10 comprising an inner cylinder 12, an outer cylinder 14, and a rubber elastic body 16, the inner cylinder 12 includes a first swollen part 18 in an axially perpendicular direction Y at a central portion in an axial direction X, the first swollen part having an outer circumferential surface formed into a convex spherical surface 20, and the outer cylinder 14 includes a second swollen part 22 in the axially perpendicular direction Y at a portion surrounding the convex spherical surface 20, the second swollen part having an inner circumferential surface formed into a concave spherical surface 24 concentric to the convex spherical surface 20. The link member 30 provided with this vibration control bush includes a split type link body 36, and the link body 36 is joined after split type cylindrical retaining parts 38a and 38b are fitted onto the vibration control bush 10 from both axial sides thereof. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an anti-vibration bush used by being incorporated in an automobile suspension device or the like, and a link member including the anti-vibration bush.

  2. Description of the Related Art Conventionally, in an automobile suspension device, a vibration isolating bush is used at a connection portion between a vehicle body and a suspension for the purpose of vibration damping and buffering. The anti-vibration bush is generally provided between a shaft member such as an inner cylinder, an outer cylinder arranged at intervals on the outer side of the shaft member, and the shaft member and the outer cylinder to elastically both. And a rubber-like elastic body to be bonded together. The anti-vibration bush may be incorporated as a link member with respect to the suspension device, and the link member generally includes a link main body including an arm portion and connecting portions provided at both ends thereof. An anti-vibration bush is provided (see Patent Documents 1 to 3 below).

  For example, Patent Document 4 below discloses a multi-link type rear suspension device shown in FIGS. 11 and 12 as a suspension device including a link member. In this suspension apparatus, an axle 62 that rotatably supports a wheel 60, one end portions 64a and 66a are swingably connected to the axle 62, and the other end portions 64b and 66b are pivoted to a suspension member 68 that is a vehicle body side member. A pair of front and rear upper links 64 and 66, which are movably connected, and one end portions 70a and 72a are swingably connected to the axle 62, and the other end portions 70b and 72b are swingably connected to the suspension member 68. A pair of front and rear lower links 70, 72, and a toe control link 74 having one end 74 a pivotably connected to the axle 62 and the other end 74 b pivotably connected to the suspension member 68. Here, the symbol F indicates the front side of the vehicle body, and the symbol H indicates the vehicle body width direction.

  The other ends 64b, 66b, 70b, 72b, 74b of the links 64, 66, 70, 72, 74 and the suspension member 68 are connected to each other through vibration-proof bushings 76, 78, 80, 82, 84, respectively. The shaft centers p1, p2, p3, p4, and p5 of each anti-vibration bushing are arranged so as to be along a direction orthogonal to the longitudinal directions r1, r2, r3, r4, and r5 of each link in plan view. Has been.

By the way, as a vibration-proof bush as described above, a bulge portion that bulges in the axially central portion of the inner cylinder in the axially perpendicular direction in order to reduce the spring constant in the twisting direction while increasing the spring constant in the axially perpendicular direction A so-called bulge-type anti-vibration bush is provided (see Patent Document 5 below).
Japanese Patent Laid-Open No. 11-166484 JP 09-254621 A JP 2000-337416 A JP 2005-112258 A JP 2004-144150 A

  In the multi-link suspension device, as shown in FIG. 12, each link 64, 66, 70, 72, 74 is set in an inclined posture in plan view. More specifically, the front lower link 70 is set to an inclined posture positioned on the vehicle front side F toward the inner side in the vehicle body width direction H in plan view, and the rear lower link 72 is set to the vehicle body width in plan view. The toe control link 74 is set to an inclined posture that is positioned on the front side F of the vehicle body in the vehicle width direction H in a plan view. Yes.

  Therefore, during traveling of the vehicle, forces in various directions are input to the vibration isolating bushes 80, 82, 84 coupled mainly to the lower links 70, 72 and the toe control link 74. For example, when the suspension device is displaced in the vertical direction with respect to the vehicle body, not only a force in the twisting direction N (see FIG. 5) but also a force in the twisting direction Z (see FIG. 1) is applied to the vibration isolating bushes 80, 82, and 84. . Further, when the suspension device is displaced in the left-right direction with respect to the vehicle body, not only the force in the direction perpendicular to the axis Y (see FIG. 1) but also the force in the axis direction X (see FIG. 1) is applied to the vibration isolating bushes 80, 82, 84. Join.

  In response to such an input, in the conventional general anti-vibration bushing, both the inner cylinder and the outer cylinder are straight cylinders having a constant diameter, so that the spring constant in the twisting direction is large. Since the spring constant in the direction becomes large, it is difficult to improve riding comfort. Further, with this conventional vibration-proof bushing, the spring constant in the axial direction is not so large, and therefore, the spring constant in the left-right direction of the suspension device cannot be increased, so it is difficult to improve the steering stability of the vehicle.

  In contrast, the conventional bulge type vibration-proof bushing can reduce the spring constant in the twisting direction. However, even in the conventional bulge type, the outer cylinder is a straight cylinder with a constant inner diameter, so that when it is displaced in the twisting direction, the rubber is elastic between the inner cylinder and the outer cylinder at both ends in the axial direction. The elastic body is compressed, and the spring constant in the twisting direction is not always sufficiently reduced. For this reason, the effect of reducing the spring constant in the vertical direction of the suspension device is also insufficient, and further improvement is required to improve riding comfort. Also, with the conventional bulge type anti-vibration bush, the spring constant in the axial direction cannot be increased, so it is difficult to increase the spring constant in the left-right direction of the suspension device and improve the steering stability of the vehicle. Met.

  The present invention has been made in view of such points, and the vibration isolating bush that can sufficiently reduce the spring constant in the twisting direction and can increase the spring constant in the axial direction, and It aims at providing a link member provided with a vibration proof bush.

  An anti-vibration bush according to the present invention comprises a shaft member, an outer cylinder disposed on the outer side of the shaft member at an interval, and a rubber-like elastic body interposed between the shaft member and the outer cylinder. The shaft member has a first bulging portion that bulges in a direction perpendicular to the axis at a central portion in the axial direction, and an outer peripheral surface of the first bulging portion is formed into a convex spherical surface. The outer cylinder is formed in a second bulging portion in which a portion surrounding the convex spherical surface bulges outward in a direction perpendicular to the axis, and an inner peripheral surface of the second bulging portion is the convex spherical surface. It is formed in a concentric concave spherical surface.

  According to this configuration, the second bulging portion is provided in the outer cylinder, and the inner circumferential surface thereof is a concave spherical surface that is concentric with the convex spherical surface of the first bulging portion of the inner cylinder. At this time, the rubber-like elastic body interposed between the convex spherical surface and the concave spherical surface is substantially only subjected to shear deformation, and the rubber-like elastic body is compressed between the inner cylinder and the outer cylinder. Since it can be avoided as much as possible, the spring constant in the twisting direction can be effectively reduced. In addition, since the rubber-like elastic body is subjected not only to shear deformation but also to compression deformation between the convex spherical surface and the concave spherical surface at the time of displacement in the axial direction, the spring constant in the axial direction can be increased.

  In the anti-vibration bush of the present invention, the rubber-like elastic body is not filled between the shaft member and the outer cylinder on the axially outer side of the virtual spherical surface defined by the concave spherical surface, and the convex spherical surface and the It is preferable to be interposed between the concave spherical surface. Further, both end surfaces in the axial direction of the rubber-like elastic body are formed in a curved surface shape that swells inward in the axial direction, and a virtual spherical surface defined by the concave spherical surface in a cross section along the axial direction of the shaft member is the curved surface. And an intersection (J) between the phantom spherical surface and the axial end surface is located closer to the outer cylinder than an innermost point (K) on the axial end surface. It is preferable. This reliably prevents the compression spring from being applied at the axial end of the rubber-like elastic body when displaced in the twisting direction, and the spring constant in the twisting direction can be further reduced.

  The link member according to the present invention comprises a link main body comprising an arm portion and connecting portions provided at both ends thereof, and the vibration-proof bushing held in a cylindrical holding portion provided in at least one of the connecting portions. A link member comprising: a first tube portion that is fitted on an outer tube portion on one axial side of the top portion with the top portion of the second bulging portion as a boundary; and the top portion A second cylindrical portion that is fitted on the outer cylindrical portion on the other axial side, and the link body includes a first member that includes the first cylindrical portion, and a second member that includes the second cylindrical portion; The first cylinder part and the second cylinder are externally fitted to the anti-vibration bush from the one axial side and the second cylindrical part from the other axial side. Forming the cylindrical holding portion and joining the first member and the second member to form the phosphor It is obtained by forming the body.

  When the outer cylinder has the second bulging portion as described above, the vibration isolating bush cannot be press-fitted if the cylindrical holding portion of the link member is a simple straight cylinder. Therefore, the cylindrical holding part is divided into a first cylindrical part and a second cylindrical part, and is fitted to the vibration isolating bush from both sides in the axial direction, so that the outer cylinder has a bulging part. The bush can be held by the cylindrical holding portion. Further, the held vibration-proof bushing prevents the bulging portion of the outer cylinder from coming off and is difficult to come off from the cylindrical holding portion, so that it is possible to reduce the tightening margin of the outer cylinder with respect to the cylindrical holding portion. .

  In the link member, the arm part includes a first arm part provided integrally with the first cylinder part and a second arm part provided integrally with the second cylinder part, The arm portion may be formed by the first arm portion and the second arm portion by joining one member and the second member. Since the arm part is also divided in this way, it is easy to provide a hollow part in the arm part, the weight can be reduced, and the arm part can be provided by extending the longitudinal part of the arm part. It is also possible to increase the strength.

  According to the present invention, the spring constant in the twisting direction of the vibration isolating bush can be sufficiently reduced, and the spring constant in the axial direction can be increased.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a vibration isolating bush 10 according to the embodiment, and FIGS. 3 to 8 show a link member 30 including the vibration isolating bush 10. FIG. The link member 30 is used in the multilink suspension device shown in FIGS. 11 and 12 described above, and is used as the front and rear lower links 70 and 72 and the toe control link 74. More specifically, the anti-vibration bush 10 connects the other end portion 70 b of the front lower link 70 and the suspension member 68, and the other end portion 72 b of the rear lower link 72 and the suspension member 68. Are installed in the suspension device so as to be used as a vibration isolating bush 82 for coupling the toe control link 74 and the suspension member 68.

  The overall configuration of the suspension device is as described above, and a description thereof will be omitted. The link member 30 can also be used as the front and rear upper links 64 and 66. In this case, the vibration isolating bush 10 connects the other end portion 64b of the front upper link 64 and the suspension member 68. 76, and the other end portion 66b of the rear upper link 66 and the suspension member 68 are incorporated into the suspension device so as to be used as a vibration isolating bush 78.

  As shown in FIG. 1, the anti-vibration bush 10 includes an inner cylinder 12 as a shaft member, an outer cylinder 14 that is coaxially disposed so as to surround the inner cylinder 12, and an inner cylinder 12 and an outer cylinder 14. And a cylindrical rubber elastic body 16 interposed therebetween.

  The inner cylinder 12 is a cylindrical member made of metal such as iron, steel, or aluminum, and includes a bulging portion 18 that bulges around the entire circumference in the central portion in the axial direction X toward the outside in the direction perpendicular to the axis Y. . The outer peripheral surface of the bulging portion 18 forms a convex spherical surface 20. The convex spherical surface 20 is formed in the shape of a sphere that forms the axial central portion of a spherical surface having a center P on the axis A, and is a general cylindrical portion (with a constant outer diameter) at both axial end portions of the inner cylinder 12. The straight cylindrical part) is formed smoothly and continuously from the outer peripheral surface 13.

  The outer cylinder 14 is a cylindrical member made of metal such as iron, steel, or aluminum, and is a cylindrical body having a substantially constant thickness over the entire axial direction X. The outer cylinder 14 is formed in a bulging portion 22 in which a central portion in the axial direction X surrounding the convex spherical surface 20 bulges in a spherical shape over the entire circumference in the direction perpendicular to the axial direction Y.

  The inner peripheral surface of the bulging portion 22 of the outer cylinder 14 forms a concave spherical surface 24 that is concentric with the convex spherical surface 20 (that is, has a common center P). The outer peripheral surface of each of them forms a convex spherical surface 25 concentric with the convex spherical surface 20. More specifically, the inner peripheral surface and the outer peripheral surface of the bulging portion 22 are respectively in the concave spherical surface so as to follow the convex spherical surface 20 of the inner cylinder 12 with a certain interval in the shape after drawing described later. 24 and a convex spherical surface 25. The concave spherical surface 24 and the convex spherical surface 25 form a spherical shape that forms the central portion of the spherical surface, and the inner peripheral surface of the general cylindrical portion (straight cylindrical portion having a constant inner diameter) 15 at both axial ends of the outer cylinder 12. 15a and the outer peripheral surface 15b are respectively formed continuously smoothly.

  Although not shown, in the state before drawing, the inner peripheral surface and outer peripheral surface of the bulging portion 22 of the outer cylinder 14 are not strictly concave spherical surfaces 24 and convex spherical surfaces 25, but the center P is the axis of the outer cylinder 14. The center P is formed at a position shifted in the direction perpendicular to the axis Y from the center A and drawn in the direction of diameter reduction, so that the center P is formed in a spherical shape located on the axis A as shown in FIG.

  The rubber-like elastic body 16 is integrally vulcanized and bonded to the inner peripheral surface of the outer cylinder 14 and the outer peripheral surface of the inner cylinder 12, and the convex spherical surface 20 of the inner cylinder 12 and the concave spherical surface of the outer cylinder 14. As shown in FIG. 1, the shape after drawing is formed in a spherical band shape having a substantially constant thickness.

  Further, as shown in FIG. 2, the rubber-like elastic body 16 is filled between the inner cylinder 12 and the outer cylinder 14 on the axially outer side X1 of the virtual spherical surface 26 defined by the concave spherical surface 24 on the outer cylinder 14 side. It is formed not to be.

  More specifically, the rubber-like elastic body 16 has a pair of left and right axial end surfaces 17 of the rubber-like elastic body 16 exposed between the axial ends of the inner cylinder 12 and the outer cylinder 14 in the axially inward direction. It is formed in a curved surface shape that swells to the side X2, and here, it is curved and formed in an arc shape in a cross section along the axial direction X shown in FIG. In the cross section along the axial direction, the phantom spherical surface 26 defined by the concave spherical surface 22 intersects the curved axial end surface 17 at the intersection J, and this intersection J is the most in the axial end surface 17. An axially inner point (that is, a point corresponding to the deepest part (bottom) of the axial end face 17) K is located on the outer cylinder 14 side. In this example, the innermost point K on the axial end face 17 is on a line 27 that bisects the gap between the inner cylinder 12 and the outer cylinder 14 in the radial direction, and is radially outside the line 27. The intersection J is located on the side.

  2, the outermost diameter (outer diameter at the apex of the bulging portion 18) D1 of the bulging portion 18 on the inner cylinder 12 side is larger than the inner diameter D2 of the general cylindrical portion 15 of the outer cylinder 14. The thickness E of the rubber-like elastic body 16 between the convex spherical surface 20 and the concave spherical surface 24 is set to be larger than the maximum bulging height G of the bulging portion 18 of the inner cylinder 12. Yes. Thereby, while avoiding an excessive spring constant in the axial direction X, preferable spring constants in the direction perpendicular to the axis Y, the twisting direction Z, and the torsional direction N are obtained.

  A rubber film 28 that is continuous from the rubber-like elastic body 16 is formed on the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 14 on the axially outer side X1.

  When manufacturing the anti-vibration bushing 10, the inner cylinder 12 having the bulging portion 18 and the outer cylinder 14 having the bulging portion 22 are arranged in a molding die (not shown), and rubber is placed in the molding die. The rubber-like elastic body 16 is vulcanized and molded by injecting the material, and the rubber-like elastic body 16 is integrally vulcanized and bonded to the outer peripheral surface of the inner cylinder 12 and the inner peripheral surface of the outer cylinder 14. Next, the vibration-insulating bush 10 shown in FIG. 1 is obtained by subjecting this vulcanized molded body to a drawing process in the direction of diameter reduction using a die (not shown).

  As shown in FIGS. 3 and 4, the link member 30 includes a substantially bar-shaped metal link main body 36 including an arm portion 32 and a pair of connecting portions 34, 34 provided at both ends thereof, and the link main body 36. It is comprised with the vibration proof bush 10 assembled | attached to.

  In this example, the connecting portion 34 is provided with a cylindrical holding portion 38 that externally holds the vibration isolating bush 10 on one end side, and a bracket portion 40 for attaching another vibration isolating bush 100 to the other end side. Is provided.

  The cylindrical holding portion 38 externally holds the outer cylinder 14 in a direction (thickness direction T shown in FIG. 4) in which the axis A of the vibration isolating bush 10 is orthogonal to the longitudinal direction R of the link member 30. And is formed in a cylindrical shape.

  The bracket portion 40 is formed in a U-shaped cross section including a pair of mounting plate portions 42, 42, and both mounting plate portions 42 are provided with bolt holes 43, respectively, and are not penetrating through the bolt holes 43. The inner cylinder 102 of the anti-vibration bush 100 is fixed by the illustrated bolt. The bracket portion 40 also holds the vibration isolating bush 100 in a direction whose axis is perpendicular to the longitudinal direction R.

  The arm portion 32 includes a hollow portion 44 extending substantially over the entire length direction R at the center in the width direction S thereof. Further, flanges 46 projecting on both sides in the thickness direction T are provided on both side edges in the width direction S, and the flanges 46 are also provided continuously on the peripheral edge of the connecting portion 34 on the cylindrical holding portion 38 side. It has been.

  The link body 36 is formed by joining a first member 48 and a second member 50 formed by press-molding a metal plate, and both members 48 and 50 are formed in the same shape in this example.

  Specifically, as shown in FIG. 6, the cylindrical holding portion 38 is fitted on the outer cylinder portion 14 a on the one axial side from the top portion 22 a without a gap with the top portion 22 a of the bulging portion 22 of the outer cylinder 14 as a boundary. The first cylinder portion 38a and the second cylinder portion 38b that fits outside the top portion 22a in the axially other side of the outer cylinder portion 14b without a gap. Moreover, the arm part 32 is comprised by the 1st arm part 32a and the 2nd arm part 32b which are divided into 2 in the said thickness direction T, as shown in FIG. 4, FIG. Further, as shown in FIG. 4, the bracket portion 40 is configured by a first bracket portion 40 a having one attachment plate portion 42 and a second bracket portion 40 b having the other attachment plate portion 42. The first tubular portion 38a, the first arm portion 32a, and the first bracket portion 40a are integrally connected to constitute the first member 48, and the second tubular portion 38b, the second arm portion 32b, and the first The second member 50 is configured by integrally connecting the two bracket portions 40b.

  The assembly of the vibration isolating bush 10 to the link body 36 is performed as follows. In other words, the first cylindrical portion 38a is press-fitted into the externally fitted state from one axial side X3 (see FIG. 6, upper side in FIG. 6) with respect to the vibration isolating bush 10, and the other axial side X4 (see FIG. 6). The first member 48 and the second member 50 are overlapped by press-fitting the second cylindrical portion 38b into the external fitting state from the lower side in FIG. Then, the overlapping portions 52 are joined by welding or the like. Thereby, the link main body 36 is formed in a state where the vibration isolating bush 10 is held in the cylindrical holding portion 38 formed by overlapping the first cylindrical portion 38a and the second cylindrical portion 38b. Further, by overlapping the first arm portion 32a and the second arm portion 32b, as shown in FIG. 7, the arm portion 32 including the hollow portion 44 is formed inside the overlapping portion 52.

  As shown in FIG. 8, the link member 30 having the above configuration is such that the both end surfaces of the inner cylinder 12 are sandwiched between the brackets 1 of the suspension member 68 at the connecting portion 34 on the one end side holding the vibration isolating bush 10. The bracket 1 is fixed by fastening with a fastening member such as a bolt 2 and a nut 3. In addition, the connecting portion 34 on the other end side including the bracket portion 40 is connected to the axle 62 (see FIG. 11) via another anti-vibration bush 100.

  In the present embodiment configured as described above, the bulging portion 22 is provided in the outer cylinder 14 of the vibration isolating bush 10, and the inner peripheral surface thereof is a concave shape concentric with the convex spherical surface 20 of the bulging portion 18 of the inner cylinder 12. Since the spherical surface 24 is used, the force received by the rubber-like elastic body 16 interposed between the convex spherical surface 20 and the concave spherical surface 24 during displacement in the twisting direction Z is only shear deformation. The spring constant can be effectively reduced. As a result, the spring constant in the vertical direction of the suspension device can be reduced, so that riding comfort can be improved.

  Further, as shown in FIG. 2, when the displacement in the axial direction X is performed, the rubber-like elastic body 16 receives not only shear deformation but also compression deformation between the convex spherical surface 20 and the concave spherical surface 24. The spring constant at X can be increased. Thereby, the spring constant in the left-right direction of the suspension device is increased, and the steering stability can be improved. Therefore, both ride comfort and handling stability can be achieved.

  In particular, on the axially outer side X1 of the phantom spherical surface 26, the rubber-like elastic body 16 is not filled between the inner cylinder 12 and the outer cylinder 14, and further, the phantom spherical face 26 and the rubber-like surface are not filled. Since the intersection J with the axial end surfaces 17 of the elastic body 16 is positioned closer to the outer cylinder 14 than the innermost point K of the axial end face 17, the rubber-like elastic body is displaced in the twisting direction Z. It is possible to reliably avoid the compression spring from being applied at the 16 axial ends, and to further reduce the spring constant in the twisting direction Z. Therefore, the spring constant in the vertical direction of the suspension device can be further reduced and the suspension can be made flexible, so that the vertical movement is absorbed by the suspension so as not to change the height of the occupant's eyes. A feeling can be obtained.

  Further, since the outer cylinder 14 has a concave spherical surface 24 on the inner peripheral surface, but has a thin cylindrical shape having a constant thickness in the axial direction X, a cylindrical body having a thick portion in a part in the axial direction. Compared to the case, it is easier to perform drawing after the rubber-like elastic body 16 is vulcanized.

  On the other hand, when the bulging portion 22 bulging outward is provided on the outer cylinder 14 in this manner, it is difficult to assemble the link member 30 to the cylindrical holding portion 38. As a split type of the first member 48 and the second member 50, the first cylindrical portion 38a and the second cylindrical portion 38b are press-fitted from both sides in the axial direction with respect to the vibration isolating bushing 10, and the first by welding after press-fitting. Since the link body 36 is formed by joining the member 48 and the second member 50, the vibration isolating bush 10 having the bulging portion 22 can be easily held by the cylindrical holding portion 38.

  Further, the held vibration isolating bushing 10 is prevented from coming off from the cylindrical holding portion 38 because the bulging portion 22 of the outer cylinder 14 is prevented from coming off, and therefore, the tightening margin of the outer cylinder 14 with respect to the cylindrical holding portion 38 is reduced. Thus, press-fit workability can be improved.

  Further, since the arm portion 32 is divided, the hollow portion 44 can be easily provided, and the hollow portion 44 can reduce the weight. Further, by providing the hollow portion 44 along the longitudinal direction R of the arm portion 32, the strength of the arm portion 32 can be increased.

  9 and 10 show a link member 54 according to another embodiment. In this example, cylindrical holding portions 38, 38 are provided on the connecting portions 34, 34 on both sides of the link body 36, and the vibration isolating bushes 10, 10 are assembled to the cylindrical holding portions 38, 38 on both sides. . The configuration of the other link members and the configuration of the vibration isolating bush 10 are the same as those in the above embodiment.

  In the above embodiment, the bulging portion 18 provided in the inner cylinder 12 is integrally formed of a metal material in order to obtain a bulge-type bush. However, a resin-made annular covering is provided on the outer peripheral surface of the inner cylinder. Thus, the bulging portion may be formed.

It is sectional drawing of the anti-vibration bush which concerns on one Embodiment of this invention. It is a principal part expanded sectional view of the vibration proof bush. It is a top view of the link member concerning an embodiment. It is the IV-IV sectional view taken on the line of FIG. It is a principal part enlarged plan view of the link member. It is a principal part expanded sectional view of the link member. It is the VII-VII sectional view taken on the line of FIG. It is principal part sectional drawing which shows the assembly | attachment state of the link member. It is a top view of the link member concerning other embodiments. It is the IX-IX sectional view taken on the line of FIG. It is a perspective view of a suspension device. It is a top view of a suspension apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Anti-vibration bush, 12 ... Inner cylinder (shaft member), 14 ... Outer cylinder, 14a ... Outer cylinder part of one axial direction, 14b ... Outer cylinder part of the other axial direction, 16 ... Rubber-like elastic body, 17 ... axial end face of rubber-like elastic body, 18 ... bulging part of inner cylinder (first bulging part), 20 ... convex spherical surface, 22 ... bulging part of outer cylinder (second bulging part), 22a ... Top of the bulging portion, 24 ... concave spherical surface, 26 ... virtual spherical surface, 30, 54 ... link member, 32 ... arm portion, 32a ... first arm portion, 32b ... second arm portion, 34 ... connecting portion, 36 ... link Main body, 38 ... cylindrical holding part, 38a ... first cylinder part, 38b ... second cylinder part, 48 ... first member, 50 ... second member, J ... intersection of virtual spherical surface and axial end face, K ... axial direction Innermost point on the end surface in the axial direction, X: axial direction, X1: axially outward side, X2: axially inward side, X3: axially one side, X4: axially The other side, Y ... Transverse, Z ... prying direction

Claims (5)

An anti-vibration bushing comprising: a shaft member; an outer cylinder disposed on the outer side of the shaft member with an interval; and a rubber-like elastic body interposed between the shaft member and the outer cylinder,
The shaft member has a first bulging portion that bulges in a direction perpendicular to the axis at a central portion in the axial direction, and an outer peripheral surface of the first bulging portion is formed into a convex spherical surface.
The outer cylinder is formed in a second bulging portion in which a portion surrounding the convex spherical surface bulges outward in a direction perpendicular to the axis, and an inner peripheral surface of the second bulging portion is concentric with the convex spherical surface. Anti-vibration bush characterized by being formed into a concave spherical surface.   The rubber-like elastic body is interposed between the convex spherical surface and the concave spherical surface so as not to be filled between the shaft member and the outer cylinder on the axially outer side of the virtual spherical surface defined by the concave spherical surface. 2. The anti-vibration bush according to claim 1, wherein the anti-vibration bush is provided. Both end surfaces in the axial direction of the rubber-like elastic body are formed into curved surfaces that swell inward in the axial direction,
In a cross section along the axial direction of the shaft member, a virtual spherical surface defined by the concave spherical surface intersects the curved surface-shaped axial end surface, and an intersection (J) between the virtual spherical surface and the axial end surface is: The anti-vibration bush according to claim 1 or 2, wherein the anti-vibration bush is located closer to the outer cylinder than the innermost point (K) in the axial end face. The link main body which consists of an arm part and the connection part provided in the both ends of this arm part, and the cylindrical holding part provided in the at least one connection part, The holding | maintenance in any one of Claims 1-3 A link member comprising an anti-vibration bush,
A first cylindrical portion that fits on an outer cylindrical portion on one axial side of the top from the top of the second bulging portion; and an outer cylindrical portion on the other axial side of the top. And a second cylindrical portion that fits outside,
The link main body includes a first member including the first tube portion and a second member including the second tube portion,
The first tube portion is externally fitted to the anti-vibration bush from one side in the axial direction, the second tube portion is externally fitted from the other side in the axial direction, and the first tube portion and the second tube portion are used. A link member, wherein the link main body is formed by joining the first member and the second member while forming the cylindrical holding portion.   The arm portion includes a first arm portion provided integrally with the first tube portion, and a second arm portion provided integrally with the second tube portion, and the first member and the second member. The link member according to claim 4, wherein the arm portion is formed by the first arm portion and the second arm portion by joining the members.

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