JP4633575B2 - 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. Such a stabilizer bar is supported by a suspension member on the body side, and at this time, a stabilizer bush made of a rubber-like elastic body is interposed to couple the stabilizer bar to the suspension member in a vibration-proof manner.

  For example, in Japanese Patent Laid-Open No. 10-24861, as shown in FIG. 13, 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 stabilizers are provided at two locations on the left and right sides. A structure for supporting the bar 100 on the suspension members 104 and 104 is disclosed. 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, such stabilizer bushes have been formed such that the diameter of the inner peripheral surface to be brought into close contact with the outer peripheral surface of the stabilizer bar is constant over the entire length of the stabilizer bar (for example, JP-A-11-82625 and JP-A-2002-274145). Such).
Japanese Patent Laid-Open No. 10-24861 JP-A-11-82625 JP 2002-274145 A

  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 formed of a cylindrical rubber-like elastic body, and is externally fitted to the stabilizer bar so that the inner circumferential surface thereof is in close contact with the outer circumferential surface of the stabilizer bar, and the bracket is fitted to the stabilizer bar. A stabilizer bush sandwiched between the suspension member and the suspension member ,
A dust cover that externally fits to the stabilizer bar protrudes from one end surface in the axial direction, and the dust cover is formed in a tapered cylindrical shape having a smaller diameter toward the outer side in the axial direction. The inner peripheral surface portion of the cover is located radially inward from the remaining inner peripheral surface portion , and the inner peripheral surface portion of the dust cover and the remaining inner peripheral surface portion are smooth without a step. Are connected,
The outer peripheral surface of the dust cover is formed in a conical surface shape that is inclined radially inward toward the axial center outward, and the inner peripheral surface portion of the dust cover is a convex curve toward the radially outer side. Formed in a plane,
The tip surface of the dust cover has a planar shape perpendicular to the axial direction, and the inner peripheral surface portion of the dust cover has a curved surface shape that protrudes radially inward at the tip of the dust cover. And a second portion connecting the first portion and the tip surface, the radius of curvature of the first portion is set larger than the radius of curvature of the second portion,
On the pressed surface side pressed by the bracket, a convex portion that enters a through-hole formed in the bracket is protruded, and the bracket and the suspension bar are sandwiched and fixed by the bracket and the suspension member. When viewed from the direction of clamping by the suspension member, the convex portion does not overlap with the axis of the stabilizer bar, and at least a part of the convex portion is radially outward of the stabilizer bar from the outer peripheral surface of the stabilizer bar. The protrusions are arranged so as to protrude .

  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. The tapered cylindrical dust cover formed so as to protrude outward in the axial direction is surrounded by a space on the radially outer side, so the stabilizer is elastically deformed radially outward when assembled. Fits around the bar. For this reason, for example, compared to a structure in which a simple annular protrusion is provided on the inner periphery of one end of the stabilizer bush, the increase in the pressure contact force of the dust cover against the stabilizer bar can be suppressed, and the assembly work to the stabilizer bar can be suppressed. In addition, it is possible to avoid the stress from being concentrated on the dust cover.

In the present invention, the inner peripheral surface portion of the dust cover is formed in a curved surface convex toward the radially outer side, and the tip surface of the dust cover is perpendicular to the axial direction. A first portion having a planar shape, and an inner peripheral surface portion of the dust cover having a convex curved surface shape toward a radially inward side at a tip portion of the dust cover; and And a second portion connecting the tip surface, and the radius of curvature of the first portion is set larger than the radius of curvature of the second portion . 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 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.

  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.

  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 a rubber layer having a two-layer structure of a highly slidable inner layer rubber 14 and an outer layer rubber 16 in order to prevent the generation of noise due to slip between the inner peripheral surface 12 and the stabilizer bar 1. It is made of an elastic body and has a holding hole 18 having a circular cross section through which the stabilizer bar 1 passes in the center. In addition, examples of the highly slidable rubber forming the inner layer rubber 14 include rubbers containing higher fatty acid amides.

  As shown in FIG. 6, a dust cover 24 is provided on one end face 20 in the axial direction J of the stabilizer bush 10 so as to be externally fitted to the stabilizer bar 1 while projecting outward in the axial direction J1. The dust cover 24 is formed in a tapered cylindrical shape having a smaller diameter toward the outer side J1 in the axial direction. Of the inner peripheral surface 12, the inner peripheral surface portion 12A of the dust cover 24 is located on the radially inner side K1 side with respect to the remaining inner peripheral surface portion 12B, and both of these inner peripheral surface portions 12A and 12B. 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 dust cover 24 is provided on one end face 20 of the stabilizer bush 10 facing the wheel side when the vehicle is mounted, and is formed around the holding hole 18 on the one end face 20 of the inner rubber layer 14 (see FIG. 3). ). The inner layer rubber 14 has one end portion 14A bulging outwardly in the radial direction K2 with respect to the other portion 14B, and the dust is formed on the end surface 20 on the bulged one end portion 14A side. A cover 24 is formed.

  The dust cover 24 is formed in a tapered shape so that the thickness becomes thinner toward the tip side. 6 and 7, the outer peripheral surface 24C of the dust cover 24 is inclined with respect to the axial direction J, that is, a conical surface inclined inward in the radial direction K1 toward the axial direction outward J1. Is formed. On the other hand, the inner peripheral surface portion 12A of the dust cover 24 is formed in a convex curved surface shape toward the radially outer side K2. That is, in the cross section along the axial direction J, the inner peripheral surface portion 12A of the dust cover 24 is formed in an arc shape having a center on the radially inner side K1 side and having a predetermined radius of curvature R1.

  The dust cover 24 has a planar shape whose tip surface 24A on the minimum diameter side is perpendicular to the axial direction J. 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 R2 of the first portion 26 is set larger than the radius of curvature R3 of the second portion 28. Specifically, the first portion 26 has an arc shape having a center on the radially outer side K2 in the cross section along the axial direction J, and the curvature radius R2 is smaller than the curvature radius R1, and The inner peripheral surface portion 12A having the radius of curvature R1 is smoothly connected. Further, 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 R3 is substantially equal. 0.

  The starting 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) 12C is the end surface 20 in the axial direction J. It is located at the same position in the axial direction J, thereby suppressing an increase in the pressure contact force of the dust cover 24 against the stabilizer bar 1 during assembly.

  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 and fixed together with the stabilizer bar 1 via a mounting bolt 4 to a single plate-like bracket 2 and the suspension member 3 in a state of being externally fitted to the stabilizer bar 1. Is done.

  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 pressed by the bracket 2, a quadrangular columnar convex portion 38 that protrudes into the rectangular through hole 5 formed in the bracket 2 is projected. Further, a base groove 38A of the convex portion 38 is formed with a thin groove 42 having an arc cross section over the entire circumference.

  As shown in FIG. 8 and FIG. 9, the convex portion 38 of the stabilizer bar 1 is seen in the clamping direction Z between the bracket 2 and the suspension member 3 in a state of being clamped and fixed together with the stabilizer bar 1 by the bracket 2 and the suspension member 3. The convex portion 38 is arranged so as not to overlap with the shaft core O2 and so that at least a part 38B of the convex portion 38 protrudes from the outer peripheral surface 1A of the stabilizer bar 1 to the radial outer side K2 side of the stabilizer bar 1. ing. 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 portion 18B 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.

  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.

  By providing such a protrusion 38, the stabilizer bush 10 protrudes from the suspension member 3 and the bracket 2 by inserting the protrusion 38 into the through hole 5 of the bracket 2 when the stabilizer bush 10 is assembled. It is possible to avoid a problem that the position is shifted around the axis of the 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 projection 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 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. Furthermore, by deviating the convex portion 38 with respect to the axial center C, it is possible to prevent the stabilizer bushes 10 attached to the left and right two locations of the vehicle from being assembled in reverse.

  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 overhanging portion 48 is configured to be sandwiched between the bracket 2 and the suspension member 3, and is provided so as to fill a gap at a joint portion between the 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.

  In addition, since a space is secured on the outer periphery of the dust cover 24, an increase in the pressure contact force of the dust cover 24 against the stabilizer bar 1 can be suppressed, and a reduction in assembly workability can be avoided, and stress can be applied to the dust cover 24. Can be prevented from being concentrated.

  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 R2 and R3 of the first portion 26 and the second portion 28 are set as described above at the front end portion 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 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.

  In the above embodiment, the dust cover 24 is provided only on the end surface 20 on one side in the axial direction J. However, the dust cover 24 may be provided on both end surfaces in the axial direction J. The present invention can also be applied to a stabilizer bush having a split structure. Further, the present invention can be applied to a stabilizer bush made of a single-layer rubber-like elastic body in addition to the two-layer structure of the inner layer rubber 14 and the outer layer rubber 16.

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 FIG. 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 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 ... Bracket, 3 ... Suspension member, 10 ... Stabilizer bush, 12 ... Stabilizer bush inner peripheral surface, 12A ... Dust cover inner peripheral surface portion, 12B ... Remaining 20 ... One end face in the axial direction of the stabilizer bush, 24 ... Dust cover, 24A ... Front end face of the dust cover, 24B ... Front end part of the dust cover, 26 ... First part, 28 ... Second part 44, 46 ... Both sides of the stabilizer bush, 48 ... Overhang, J ... Axial direction, J1 ... Axial direction outward, K1 ... Radial inward, K2 ... Radial outward, R2 ... First part Radius of curvature, R3 ... radius of curvature of the second part,

Claims (2)

It is made of a cylindrical rubber-like elastic body, and is fitted around the stabilizer bar so that the inner circumference is in close contact with the outer circumference of the stabilizer bar. A fixed stabilizer bush,
A dust cover that externally fits to the stabilizer bar protrudes from one end surface in the axial direction, and the dust cover is formed in a tapered cylindrical shape having a smaller diameter toward the outer side in the axial direction. The inner peripheral surface portion of the cover is located on the radially inner side of the remaining inner peripheral surface portion, and the inner peripheral surface portion of the dust cover and the remaining inner peripheral surface portion are smooth without a step. Are connected,
The outer peripheral surface of the dust cover is formed in a conical surface shape inclined inward in the radial direction toward the outer side in the axial direction, and the inner peripheral surface portion of the dust cover is curved convex toward the outer side in the radial direction. Formed in a plane,
The tip surface of the dust cover has a planar shape perpendicular to the axial direction, and the inner peripheral surface portion of the dust cover has a curved surface shape that protrudes radially inward at the tip of the dust cover. A first portion forming the first portion and a second portion connecting the first portion and the tip surface, the radius of curvature of the first portion is set larger than the radius of curvature of the second portion,
On the pressed surface side pressed by the bracket, a convex portion that enters a through-hole formed in the bracket is protruded, and the bracket and the suspension bar are sandwiched and fixed by the bracket and the suspension member. When viewed from the direction of clamping by the suspension member, the convex portion does not overlap with the axis of the stabilizer bar, and at least a part of the convex portion is radially outward of the stabilizer bar from the outer peripheral surface of the stabilizer bar. The convex part is arranged so that it protrudes
This is a stabilizer bush.   2. The stabilizer bush according to claim 1, 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.

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