JP4377434B2 - Stabilizer bush - Google Patents

Description

  The present invention relates to a stabilizer bush used for supporting a part in the longitudinal direction of a stabilizer bar spanned between left and right suspensions of a vehicle by a suspension member.

  Conventionally, in order to reduce rolling of the vehicle body, a stabilizer bar is hung between the left and right suspensions. The stabilizer bar is supported by the suspension member on the body side, and at this time, the stabilizer bar is coupled to the suspension member in a vibration-proof manner via a stabilizer bush made of a rubber-like elastic body.

  For example, in Japanese Patent Application Laid-Open No. 10-24861, as shown in FIG. 14, both the left and right ends of the stabilizer bar 100 are coupled to the lower ends of the left and right suspensions 102 and 102, respectively, and the two left and right positions on the inside Discloses a structure for supporting the stabilizer bar 100 on the suspension members 104 and 104. The suspension member 104 is supported by holding the stabilizer bush 104 together with the stabilizer bar 100 between the bracket 108 and the suspension member 104 using the bracket 108 in a state where the stabilizer bush 106 is externally fitted to the stabilizer bar 100. It is to fix.

Conventionally, in such a stabilizer bush, the diameter of the inner peripheral surface to be brought into close contact with the outer peripheral surface of the stabilizer bar is formed constant over the entire length of the stabilizer bar (for example, Japanese Patent Application Laid-Open No. 11-82625, Japanese Patent Application Laid-Open No. 2002). -274145).
Japanese Laid-Open Patent Publication No. 10-24861 Japanese Unexamined Patent Publication No. 11-82625 Japanese Unexamined Patent Publication No. 2002-274145

  According to the above-described conventional structure, since the diameter of the inner peripheral surface is constant over the entire length of the stabilizer bush, when vibration is input to the stabilizer bush, the inner peripheral surface portion on one end side in the axial direction, The gap between the stabilizer bar and the outer peripheral surface is easy to open, and sand and pebbles may enter through the gap, which may reduce the durability of the stabilizer bar and stabilizer bush.

  An object of the present invention is to provide a stabilizer bushing that can prevent foreign matter such as sand and pebbles from entering between the stabilizer bar and improve the durability of the stabilizer bar, as well as improving its own durability. It is in.

The stabilizer bush according to the present invention is a stabilizer bush made of a cylindrical rubber-like elastic body, and is fitted on the stabilizer bar so that the inner peripheral surface is in close contact with the outer peripheral surface of the stabilizer bar,
An annular groove is formed on one end surface in the axial direction, and a rubber-like elastic body portion radially inward from the annular groove is formed in a dust cover having a tapered cylindrical shape with a smaller diameter toward the axial direction outward side. Of the inner peripheral surface, the inner peripheral surface portion on the dust cover side is located on the radially inner side with respect to the remaining inner peripheral surface portion.

  According to this configuration, the dust cover can prevent foreign matters such as sand and pebbles from entering between the stabilizer bar and one end of the stabilizer bush. Since the tapered cylindrical dust cover is externally fitted to the stabilizer bar while elastically deforming toward the annular groove side on the radially outer side, for example, a simple annular projection protrudes from the inner peripheral portion on one end side of the stabilizer bush. Compared to the installed structure, it is possible to suppress an increase in the pressure contact force of the dust cover against the stabilizer bar, avoiding a decrease in workability of the assembly to the stabilizer bar, and adding stress to the dust cover. It can be avoided. In addition, since an annular groove is provided on the radially outer side of the dust cover, the side surface of the annular groove on the radially outer side acts as a stopper when excessive vibration is input to the stabilizer bush. Further, excessive deformation of the dust cover in the radially outward direction can be restricted.

  In the said invention, it is preferable that the inner peripheral surface part by the side of the said dust cover is formed in the convex curved surface shape toward the radial direction outer side. Further, the tip surface of the dust cover has a planar shape perpendicular to the axial direction, and the inner peripheral surface portion on the dust cover side is a convex curve toward the radially inward side at the tip portion of the dust cover. A first portion having a planar shape, and a second portion connecting the first portion and the tip surface, and a radius of curvature of the first portion is set to be larger than a radius of curvature of the second portion. Is preferred. By setting the shape of the dust cover in this way, it is possible to avoid a problem that foreign matter is caught in the tip of the dust cover when vibrations are input and the state where the dust cover is assembled.

  In the present invention, the annular groove has a radially outer side surface formed in parallel with the axial direction and a radially inner side surface with respect to the axial direction in a cross section along the axial direction. It is preferable that the bottom surface connecting the side surface on the radially outer side and the side surface on the radially inner side is formed in an arc shape. Thereby, the stress concentration on the bottom surface of the annular groove can be relaxed and the durability of the dust cover can be improved.

  In the present invention, the annular groove is provided on both end faces in the axial direction, a rubber-like elastic body portion radially inward from each annular groove is formed on the dust cover, and among the inner peripheral surfaces, The inner peripheral surface portion on the one dust cover side and the inner peripheral surface portion on the other dust cover side are positioned on the radially inner side with respect to the inner peripheral surface portion positioned between the two inner peripheral surface portions. May be. Thus, the dust cover can also be provided at both ends in the axial direction of the stabilizer bush.

  In the present invention, the stabilizer bush is formed of an outer layer rubber and an inner layer made of rubber having a higher slidability than the outer layer rubber in order to prevent noise generation due to slip between the inner peripheral surface and the stabilizer bar. It may consist of a cylindrical rubber-like elastic body having a two-layer structure with rubber. In this case, it is preferable that the radially outer side surface of the annular groove is formed of the inner layer rubber. For example, one end portion of the inner layer rubber may bulge outward in the radial direction from the other portion of the inner layer rubber, and the annular groove may be provided at one end portion of the bulged inner layer rubber. By forming the dust cover and the outer side surface of the annular groove surrounding the dust cover with high-sliding rubber in this way, noise is prevented and wear is reduced due to friction between the dust cover and the stabilizer bar. It is also excellent in noise prevention effect due to contact between the dust cover and the outer side of the annular groove when excessive vibration is input to the bush.

  Further, in the case of such a two-layer structure, a cutting groove extending from the holding hole for holding the stabilizer bar to the outer peripheral surface is provided, and an outer layer rubber portion facing the cutting groove across the holding hole is formed with the inner layer rubber. It may be formed in a concave shape on the boundary side.

  In the present invention, the stabilizer bush is sandwiched and fixed between the bracket and the suspension member in a state of being externally fitted to the stabilizer bar, and on both sides in a cross section in a direction perpendicular to the axial direction, An overhanging portion that protrudes into a triangular convex shape that is sandwiched between the bracket and the suspension member may be provided.

  Further, in the present invention, a convex portion that protrudes into a through hole formed in the bracket is protruded on the pressed surface side pressed by the bracket, and is sandwiched and fixed together with the stabilizer bar by the bracket and the suspension member. In this state, the convex portion does not overlap with the axis of the stabilizer bar when viewed from the clamping direction of the bracket and the suspension member, and at least a part of the convex portion is from the outer peripheral surface of the stabilizer bar. The convex portions may be arranged so as to protrude to the radially outer side of the.

  By providing such a convex portion, the stabilizer bush can be accurately positioned with respect to the suspension member and the bracket. That is, conventionally, this type of stabilizer bush has been formed so that the surface pressed against the bracket is flat across the entire surface. When the bracket and the suspension member are sandwiched and fixed, the stabilizer bush is covered with the bracket, and the stabilizer bush cannot be observed from the outside of the bracket. For this reason, it has not been possible to confirm whether the stabilizer bush is accurately attached to the target position with respect to the suspension member. As a result, the stabilizer bush may be attached to the suspension member out of the target position. For example, the pressed surface pressed against the suspension member corresponds to the uneven pressing surface on the suspension member side. When it was formed in an uneven shape, there was a problem that the press contact force between a part of the pressed surface and the pressed surface became too large, and the durability of the stabilizer bushing was likely to be lowered. According to the present invention, this problem can be solved by providing the convex portion.

  Moreover, the following effect is show | played by arrange | positioning this convex part as mentioned above. That is, a part of the force acting on the stabilizer bush from the stabilizer bar escapes from the through hole, for example, in a structure where the convex portion overlaps with the axis of the stabilizer bar when viewed from the clamping direction by the bracket and the suspension member, The force which escapes from the said through hole becomes large, and there exists a 1st malfunction which cannot fully exhibit the spring characteristic of a stabilizer bush. Further, in this structure, there is a second problem that the force acting on the base of the convex portion from the stabilizer bar and the bracket becomes large, and the base portion is easily cracked. On the other hand, according to the present invention, the convex portion does not overlap with the axis of the stabilizer bar, and at least a part of the convex portion protrudes from the outer peripheral surface of the stabilizer bar to the radially outer side of the stabilizer bar. Therefore, the force escaping from the through hole is small, and the first problem can be avoided. And the force which acts on the base part of a convex part from a stabilizer bar and a bracket becomes small, and said 2nd malfunction can be avoided.

  Further, in the present invention, if a thin groove having a circular arc cross section is formed over the entire circumference of the base portion of the convex portion, it is difficult for stress to concentrate on the base portion of the convex portion. As a result, it is possible to avoid a problem that the base portion is likely to crack.

  In the present invention, the convex portion may be arranged so as to be biased to one side in the axial direction with respect to the axial direction center of the stabilizer bush.

  According to the present invention, it is difficult for foreign matter such as sand and pebbles to enter between the stabilizer bar and the durability of the stabilizer bar and the stabilizer bush can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
1 to 6 and 10 show a stabilizer bush 10 which is made of a cylindrical rubber-like elastic body and is fitted on the stabilizer bar 1 so that the inner peripheral surface 12 is in close contact with the outer peripheral surface 1A of the stabilizer bar 1. . The stabilizer bush 10 is made of a rubber-like elastic body having a two-layer structure of a highly slidable inner layer rubber 14 and an outer layer rubber 16, and has a holding hole 18 having a circular cross section through which the stabilizer bar 1 passes.

  As shown in FIG. 6, an annular groove 22 is formed on one end face 20 in the axial direction J of the stabilizer bush 10, and a rubber-like elastic body portion on the radially inner side K <b> 1 from the annular groove 22 is A tapered cylindrical dust cover 24 having a smaller diameter is formed on the outer side J1 side in the core direction. Of the inner peripheral surface 12, the inner peripheral surface portion 12A on the dust cover 24 side is positioned on the radially inner side K1 side with respect to the remaining inner peripheral surface portion 12B, and both the inner peripheral surface portions 12A and 12B are located. Are connected smoothly without any steps. Note that the diameter of the remaining inner peripheral surface portion 12B is set so as to be fitted on the outer peripheral surface 1A of the stabilizer bar 1 with a predetermined tightening allowance.

  The annular groove 22 is provided on one end face 20 of the stabilizer bush 10 facing the wheel side when the vehicle is mounted, and is formed to be depressed in the axial direction J from the one end face 20. The annular groove 22 is provided on the one end face 20 of the inner layer rubber 14 around the holding hole 18 over the entire circumference (see FIG. 3). Further, in order to form the annular groove 22 on the one end face 20 of the inner layer rubber 14, one end portion 14A of the inner layer rubber 14 is swelled radially outward K2 through a step with respect to the other portion 14B of the inner layer rubber 14. The annular groove 22 is provided in one end portion 14A of the bulged inner rubber layer. Thus, the side surface 22A on the radially outer side K2 side of the annular groove 22 is formed by the inner rubber 14 having high slidability.

  As shown in FIG. 7, in the cross section along the axial direction J, the annular groove 22 has a radially outer K2 side surface 22A formed in parallel to the axial direction, and the radial inner K1 side. The side surface 22B is inclined with respect to the axial direction J, that is, has an inclined surface shape inclined inward in the radial direction K1 toward the axial direction outward J1. A bottom surface 22C that connects the radially outer side surface 22A and the radially inner side surface 22B is formed in an arc shape having a predetermined radius of curvature R1.

  The dust cover 24 is formed in a tapered shape so that the thickness becomes thinner toward the tip side. And as shown in FIG. 6, 12 A of inner peripheral surface parts by the side of the said dust cover 24 are formed in the curved surface shape convex toward the radial direction outward K2 side. That is, in the cross section along the axial direction J, the inner peripheral surface portion 12A on the dust cover 24 side is formed in an arc shape having a center on the radially inner side K1 side and having a predetermined radius of curvature R2 (see FIG. 7).

  Further, the dust cover 24 has a tip surface 24A on the minimum diameter side located at the same position in the axial direction J as the one end surface 20 in the axial direction J and a plane perpendicular to the axial direction J. It has a shape. Then, as shown in FIG. 7, the inner peripheral surface portion 12A on the dust cover 24 side has a first curved portion 26 that has a convex curved surface shape toward the radially inward K1 side at the tip end portion 24B of the dust cover 24. And a second portion 28 connecting the first portion 26 and the distal end surface 24A, and the radius of curvature R3 of the first portion 26 is set larger than the radius of curvature R4 of the second portion 28. Specifically, the first portion 26 has an arc shape having a center on the radially outer side K2 side in the cross section along the axial direction J, the radius of curvature R3 is smaller than the radius of curvature R2, and The inner peripheral surface portion 12A having the radius of curvature R2 is smoothly connected. In addition, the second portion 28 on the outer side of the first portion 26 is a corner portion connecting the first portion 26 and the tip end surface 24A at a substantially right angle in this embodiment, and therefore the radius of curvature R4 is substantially equal. 0.

  The depth D of the annular groove 22 defines the protrusion length of the dust cover 24 in the axial direction J, and has a certain size so that the dust cover 24 does not fall undesirably inward in the axial direction J. It is necessary to ensure. On the other hand, the opening height H in the radial direction of the annular groove 22 defines the protruding length of the dust cover 24 in the radial direction, and ensures the curvature radius R1 in order to avoid stress concentration. It is set so that the function of the dust cover 24 can be exhibited while ensuring the minimum wall thickness required for molding on the inner and outer peripheral sides of the groove 22. The depth D and the opening height H are normally set such that the opening height H is larger than the depth D.

  The start point of the dust cover 24 on the inner peripheral surface 12 (that is, the boundary between the inner peripheral surface portion 12A on the dust cover side and the remaining inner peripheral surface portion 12B) 12E is an axis with respect to the bottom surface 22C of the annular groove 22 It is preferable that the position in the core direction J is as close as possible in order to suppress an increase in the pressure contact force of the dust cover 24 against the stabilizer bar 1 during assembly. In this embodiment, as shown in FIG. 6, the starting point 12E is set within the axial direction range of the bulged one end portion 14A of the inner layer rubber 14. Since the inner layer rubber 14 is softer than the outer layer rubber 16, the pressure contact force can be reduced by providing the inner layer rubber 14 within the above range.

  Further, in the cross section along the axial direction J, the dust cover 24 has a cross-sectional area of a portion protruding radially inward K1 side from the extension line L (see FIG. 7) of the remaining inner peripheral surface portion 12B. It is set smaller than the cross-sectional area of the annular groove 22, whereby the pressure contact force during assembly can be reduced.

  As shown in FIGS. 2 and 3, the stabilizer bush 10 is provided with a cutting groove 30 extending from the holding hole 18 for holding the stabilizer bar 1 to the outer peripheral surface over the entire length in the axial direction J. The cutting groove 30 is opened, and the stabilizer bush 10 is externally fitted to the stabilizer bar 1. As shown in FIGS. 8 and 9, the stabilizer bush 10 is clamped together with the stabilizer bar 1 via a mounting bolt 4 between one plate-like stabilizer bracket 2 and the suspension member 3 in a state of being externally fitted to the stabilizer bar 1. Fixed.

  As shown in FIGS. 2 and 3, the inner rubber layer 14 has a quadrangular cross-sectional shape in a direction orthogonal to the axial direction J. Reference numeral O <b> 1 is an axis of the stabilizer bush 10. An outer layer rubber portion 16 </ b> A that faces the cutting groove 30 across the holding hole 18 is formed in a concave shape on the boundary side with the inner layer rubber 14. Thus, by providing the constricted outer layer rubber portion 16A and thinning the outer layer rubber 16 made of hard rubber, the portion 16A can be made to act as a hinge portion when the cutting groove 30 is opened to facilitate opening.

  As shown in FIG. 4, the suspension member 3 is formed with a first corrugated portion 3 </ b> A, and a second corrugated portion 32 fitted into the first corrugated portion 3 </ b> A is formed on the upper surface 34 of the stabilizer bush 10. That is, the upper surface 34 is formed in a wave shape in a cross section along the axial direction J of the stabilizer bush 10, and is configured to fit into a wave-shaped pressing surface 3 </ b> B formed in the suspension member 3. The second corrugated portion 32 includes a pair of raised portions 32A and 32A each having a trapezoidal cross section located on both ends in the axial direction J, and a recessed portion 32B located between the pair of raised portions 32A and 32A. .

  On the bottom surface 36 (corresponding to the pressed surface) of the stabilizer bush 10 that is pressed by the stabilizer bracket 2, a quadrangular columnar convex portion 38 that protrudes into the rectangular through hole 5 formed in the stabilizer bracket 2 is projected.

  As shown in FIGS. 8 and 9, when the stabilizer bracket 1 and the suspension member 3 are clamped and fixed together with the stabilizer bar 1, the convex portion 38 is seen from the direction Z in which the stabilizer bracket 2 and the suspension member 3 are clamped. The convex portion 38 is arranged so that it does not overlap with the axial center O2 of the first convex portion 38 and the portion 38B of the convex portion 38 protrudes from the outer peripheral surface 1A of the stabilizer bar 1 to the radially outward K2 side of the stabilizer bar 1. Has been. That is, the convex portion 38 does not overlap the axial core O1 of the stabilizer bush 10 (specifically, the axial core O1 of the holding hole 18 of the stabilizer bush 10) in the bottom view or the plan view of the stabilizer bush 10 and the convex portion 38. The convex portion 38 is arranged so that a part 38B of the holding hole 18 protrudes from the inner peripheral surface 12B of the holding hole 18 to the radially outer side K2 of the holding hole 18. Thus, the shaft core O2 of the stabilizer bar 1 and the shaft core O3 of the convex portion 38 are separated from each other in the direction T perpendicular to the shaft core O2 of the stabilizer bar 1.

  The protrusions 38 are a pair of first side surfaces 40, 40 along the axis O2 of the stabilizer bar 1 and a pair of second sides along the direction T perpendicular to the axis O2 of the stabilizer bar 1 when viewed from the clamping direction Z. Side surfaces 41 and 41 are provided. The width of the convex portion 38, which is the length between the pair of first side surfaces 40, is set to a length shorter than the radius of the stabilizer bar 1. Further, a thin groove 42 having a circular arc shape is formed on the base portion 38A of the convex portion 38 over the entire circumference.

  As shown in FIGS. 4 and 5, the convex portion 38 also has an axial direction J with respect to the axial center of the stabilizer bush 10 (that is, a line that bisects the total length of the stabilizer bush 10 in the axial direction J). It is biased and arranged on one side. Thereby, it can prevent that the stabilizer bush 10 attached to two places of right and left of a vehicle is reversely assembled.

  As shown in FIG. 9, the suspension member 3 is provided with a concave groove portion 6 that is depressed upward and extends in the vehicle width direction, and the stabilizer bar 1 is arranged in the concave groove portion 6. Therefore, the stabilizer bush 10 is also assembled in a state where most of the stabilizer bush 10 enters the recessed groove portion 6. The stabilizer bush 10 is provided with projecting portions 48 and 48 projecting in a triangular convex shape on both side portions 44 and 46 in a cross section in a direction perpendicular to the axial direction. Specifically, the overhanging portion 48 is formed to protrude outward in the lateral direction at the side of the stabilizer bush 10 on the bottom surface 36 side as viewed in the axial direction of the stabilizer bush 10. The overhang portion 48 is configured to be sandwiched between the stabilizer bracket 2 and the suspension member 3, and is provided so as to fill a gap at a joint portion between the stabilizer bracket 2 and the suspension member 3.

  In the present embodiment configured as described above, the dust cover 24 can prevent foreign matters such as sand and pebbles from entering between the stabilizer bar 1 and one end of the stabilizer bush 10. In particular, such foreign matters are likely to enter at the end surface on the wheel side. In the present embodiment, the dust cover 24 is provided on the end surface 20 on the wheel side, which is more effective.

  Further, since the dust cover 24 is externally fitted to the stabilizer bar 1 while being elastically deformed toward the annular groove 22, the increase in the pressure contact force of the dust cover 24 with respect to the stabilizer bar 1 can be suppressed, and the assembling workability can be reduced. In addition to being able to avoid this, it is possible to avoid stress concentration on the dust cover 24.

  Further, since the annular groove 22 is provided on the outer periphery of the dust cover 24, when excessive vibration is input to the stabilizer bar 1, the side surface 22A on the radially outer side of the annular groove 22 acts as a stopper. The excessive deformation of the dust cover 24 in the radially outward direction K2 can be restricted. Further, since the dust cover 24 is formed with the annular groove 22 provided, the axial dimension of the stabilizer bush 10 can be shortened as compared with the case where the dust cover 24 is provided on the end face 20 as it is.

  Further, since the inner peripheral surface portion 12A of the dust cover 24 is formed in an outwardly convex curved surface shape, even when vertical vibration is input to the stabilizer bush 10, the tip portion 24B side of the dust cover 24 is as much as possible. Can be applied to the stabilizer bar 1 (see FIG. 12), and the tip of the dust cover can be prevented from warping outward. Moreover, since the curvature radii R3 and R4 of the first portion 26 and the second portion 28 are set as described above at the tip 24B of the dust cover 24, the dust cover 24 is assembled to the stabilizer bar 1 as shown in FIG. In the state, it is possible to avoid a shape (for example, a shape indicated by a two-dot chain line X in FIG. 11) such that foreign matter is caught between the tip end portion 24 </ b> B of the dust cover 24 and the stabilizer bar 1.

  Further, by forming the bottom surface 22C of the annular groove 22 in the arc shape as described above, the stress concentration on the bottom surface 22C of the annular groove 22 can be relaxed and the durability of the dust cover 24 can be improved.

  In addition, since the dust cover 24 and the outer side surface 22A of the annular groove 22 surrounding the dust cover 24 are made of the highly slidable inner rubber layer 14, noise caused by friction between the dust cover 24 and the stabilizer bar 1 is prevented. In addition, wear of the dust cover 24 can be reduced. Further, when excessive vibration is input to the stabilizer bush 10, the noise prevention effect due to the contact between the outer side surface 22 </ b> A of the annular groove 22 acting as a stopper and the dust cover 24 is also excellent.

  In addition, since the convex portion 38 is provided so that the convex portion 38 is inserted into the through hole 5 of the stabilizer bracket 2 when the stabilizer bush 10 is assembled, the stabilizer bush 10 is in contact with the suspension member 3 and the stabilizer bracket 2. Thus, it is possible to avoid a problem that the position is shifted around the axis of the convex portion 38. Further, the stabilizer bush 10 is attached to the suspension member 3 at the target position by observing from the outside of the bottom surface 36 that the convex portion 38 has entered the rectangular through hole 5 (see FIGS. 8 and 9). Can be confirmed. Further, the arrangement of the convex portions 38 described above can reduce the amount of force that acts on the stabilizer bush 10 from the stabilizer bar 1 to escape from the through hole 5, and sufficiently exert the spring characteristics of the stabilizer bush 10. Moreover, the force which acts on the base part 38A of the convex part 38 from the stabilizer bar 1 and the stabilizer bracket 2 becomes small, and it can make a base part 38A difficult to crack. Moreover, by providing the thin groove 42 around the base portion 38A, the stress concentration on the base portion 38A can be further reduced.

  Further, by providing the overhang portions 48 on both sides of the stabilizer bush 10, the amount of vertical deflection of the stabilizer bush 10 is reduced, so that the protruding height of the dust cover 24 can be reduced. The amount of deformation of 24 can be suppressed and the durability can be improved.

[Second Embodiment]
The stabilizer bush 10 of the second embodiment is different from the stabilizer bush 10 of the first embodiment described above in that a second dust cover is provided on the other end surface side in the axial direction J. Other structures are the same as the structure of the stabilizer bush 10 of the first embodiment.

  That is, as shown in FIG. 13, a first annular groove 22 is formed on one end face 20 in the axial direction J of the stabilizer bush 10 (specifically, one end face 20 of the inner rubber layer 14), and a second annular groove 22 is formed on the other end face 50. An annular groove 52 is formed, and the first rubber-like elastic body portion on the radially inner side K1 from the first annular groove 22 is a tapered cylindrical first dust cover having a smaller diameter toward the axially outer side J1. The second rubber-like elastic body portion K1 in the radially inner side K1 from the second annular groove 52 is formed into a tapered cylindrical second dust cover 54 having a smaller diameter toward the outer side J1 in the axial direction. It is configured. Of the inner peripheral surface 12, the inner peripheral surface portion 12A on the first dust cover 24 side and the inner peripheral surface portion 12C on the second dust cover 54 side are the inner peripheral surface portions 12A and 12C. These inner peripheral surface portions 12A, 12C, and 12D are smoothly connected to each other without any step between the inner peripheral surface portions 12D that are positioned therebetween and radially inward.

  The second dust cover 54 is set to be thinner than the first dust cover 24, and the inner rubber layer 14 is formed at the formation portion of the second annular groove 52 provided with the second dust cover 54. Although it does not have a bulging shape like the one end portion 14A, other configurations of the second dust cover 54 and the second annular groove 52 are basically the dust cover 24 and the annular shape of the first embodiment described above. It is the same as the groove 22.

[Another embodiment]
(1) The present invention can also be applied to a stabilizer bush having a split structure.

(2) In addition to the two-layer structure of the inner layer rubber 14 and the outer layer rubber 16, the present invention can be applied to a stabilizer bush made of a single layer rubber.

(3) Examples of the highly slidable inner layer rubber 14 include a rubber containing a higher fatty acid amide.

(4) When viewed from the clamping direction Z, the shaft core O2 of the stabilizer bar 1 and the shaft core O3 of the convex portion 38 are separated from each other in the direction T perpendicular to the axial core O2 of the stabilizer bar 1, and the convex portion 38 The convex part 38 may be arrange | positioned so that the whole may protrude from the outer peripheral surface 1A of the stabilizer bar 1 to the radial direction outward K2 side of the stabilizer bar 1.

  INDUSTRIAL APPLICABILITY The present invention can be used as a stabilizer bush used for supporting a stabilizer bar that is spanned between left and right suspensions of an automobile.

Top view of stabilizer bush A view of the stabilizer bush from one outer side in the axial direction A view of the stabilizer bush from the other outer side in the axial direction Front view of stabilizer bush Bottom view of stabilizer bush VI-VI cross section of Figs. VII enlarged view of FIG. Bottom view showing the state where the stabilizer bush is assembled to the suspension member The figure which shows the state which assembled the stabilizer bush to the suspension member Sectional drawing which shows the state which fitted the stabilizer bush to the stabilizer bar XI section enlarged view of FIG. Sectional view corresponding to FIG. 11 when vibration is input to the stabilizer bush Sectional drawing of the stabilizer bush of 2nd Embodiment The perspective view which shows the support structure of the conventional stabilizer bar

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Stabilizer bar, 1A ... Stabilizer bar outer peripheral surface, 2 ... Stabilizer bracket, 3 ... Suspension member, 5 ... Through hole, 10 ... Stabilizer bush, 12 ... Stabilizer bush inner peripheral surface, 12A, 12C ... Dust cover side Inner peripheral surface portion, 12B ... remaining inner peripheral surface portion, 14 ... inner layer rubber, 14A ... one end of inner layer rubber, 14B ... other portion of inner layer rubber, 16 ... outer layer rubber, 16A ... outer layer rubber facing the cut groove Part 18, holding hole 20, one end surface in the axial direction of the stabilizer bush 22, an annular groove 22 A, a side surface on the radially outer side of the annular groove 22 B, a side surface on the radially inner side of the annular groove , 22C: bottom surface of annular groove, 24: dust cover, 24A: tip surface of dust cover, 24B: tip portion of dust cover, 26: first part, 28: second part, 30 ... Cut groove, 36 ... bottom surface (pressed surface) of stabilizer bush, 38 ... convex portion, 38A ... root portion of convex portion, 38B ... part of convex portion, 42 ... fillet groove, 44, 46 ... both sides of stabilizer bush, 48 ... Overhang, 50 ... The other end face in the axial direction of the stabilizer bush, 52 ... Second annular groove, 54 ... Second dust cover, J ... Axial direction, J1 ... Outward in the axial direction, K1 ... Diameter Inward direction, K2 ... radially outward, R3 ... radius of curvature of the first part, R4 ... radius of curvature of the second part, O2 ... axis of the stabilizer bush, T ... direction perpendicular to the axis of the stabilizer bar, Z ... Clamping direction, C ... Stabilizer bush axial center

Claims (11)

It consists of a cylindrical rubber-like elastic body with a two-layer structure consisting of an outer layer rubber and an inner layer rubber made of rubber that is more slidable than the outer layer rubber, and is externally fitted to the stabilizer bar and is fitted on the outer peripheral surface of the stabilizer bar. Stabilizer bush with a close contact surface,
An annular groove is formed on one end surface in the axial direction, and a rubber-like elastic body portion radially inward from the annular groove is formed on a dust cover having a tapered cylindrical shape with a smaller diameter toward the axial direction outward side. Of the inner peripheral surface, the inner peripheral surface portion on the dust cover side is located on the radially inner side with respect to the remaining inner peripheral surface portion, and the radially outer side surface of the annular groove is A stabilizer bush formed of the inner layer rubber. The inner peripheral surface portion on the dust cover side is formed into a convex curved surface shape toward the radially outer side,
The tip surface of the dust cover has a planar shape perpendicular to the axial direction, and the inner peripheral surface portion on the dust cover side is a curved surface convex toward the radially inner side at the tip portion of the dust cover. And a second portion that connects the first portion and the tip surface, and the curvature radius of the first portion is set larger than the curvature radius of the second portion. The stabilizer bush of Claim 1. The annular groove has a radially outer side surface formed parallel to the axial direction and a radially inner side surface inclined with respect to the axial direction in a cross section along the axial direction. The stabilizer bush according to claim 1, wherein a bottom surface connecting the radially outer side surface and the radially inner side surface is formed in an arc shape. The annular groove is provided on both end faces in the axial direction, and a rubber-like elastic body portion radially inward from each annular groove is formed on the dust cover, and one of the inner peripheral surfaces on the dust cover side The inner peripheral surface portion of the other and the other inner peripheral surface portion on the dust cover side are located on the radially inward side with respect to the inner peripheral surface portion positioned between the two inner peripheral surface portions. The stabilizer bush described. The one end part of the inner layer rubber bulges radially outward from the other part of the inner layer rubber, and the annular groove is provided at one end part of the bulged inner layer rubber. 1. The stabilizer bush according to 1. A cutting groove extending from the holding hole for holding the stabilizer bar to the outer peripheral surface is provided, and an outer layer rubber portion facing the cutting groove across the holding hole is formed in a concave shape on the boundary side with the inner layer rubber. The stabilizer bush of Claim 1. The stabilizer bush according to claim 1, wherein the stabilizer bush is sandwiched and fixed between a bracket and a suspension member in a state of being externally fitted to the stabilizer bar. The stabilizer bush according to claim 9, wherein overhanging portions projecting in a triangular convex shape sandwiched between the bracket and the suspension member are provided on both side portions in a cross section perpendicular to the axial direction. On the pressed surface side that is pressed by the bracket, a convex portion that enters the through hole formed in the bracket is projected,
The convex portion does not overlap with the axis of the stabilizer bar when viewed from the clamping direction of the bracket and the suspension member in a state of being clamped and fixed together with the stabilizer bar by the bracket and the suspension member, and the convex portion The stabilizer bush according to claim 9, wherein the protrusion is disposed so that at least a part of the protrusion protrudes from an outer peripheral surface of the stabilizer bar to a radially outward side of the stabilizer bar. The stabilizer bush according to claim 11, wherein a thin groove having a circular arc cross section is formed over the entire circumference at the base of the convex portion. The stabilizer bush according to claim 11, wherein the convex portion is arranged so as to be biased to one side in the axial direction with respect to the axial center direction of the stabilizer bush.

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