JP2008239137A - Supporting structure for stabilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit the entry of sand grains and muddy water between the outer peripheral face of a stabilizer and the inner peripheral face of a stabilizer bush by simple and highly durable structure. <P>SOLUTION: The stabilizer bush 18 is fitted to the outer peripheral face of a torsion part 15 of the stabilizer, nipped between a mounting part 19a of a vehicle body 19 and a mounting bracket 21 and fixed. Since a chamfered part 18f expanded outwardly in the radial direction is formed at the opening end of the inner peripheral face 18d of the stabilizer bush 18, when the stabilizer bush 18 is compressed inwardly in the radial direction, an inward load in the axial line L direction is generated at the opening end, to prevent the opening end from being rolled up and opened. Thus, this can inhibit the entry of sand grains and muddy water between the inner peripheral face 18d of the stabilizer bush 18 and the torsion part 15 of the stabilizer, and can prevent the generation of noise and the wear of the torsion part 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, an inner peripheral surface of a cylindrical stabilizer bush is fitted to an outer peripheral surface of a torsion portion of a stabilizer that connects the left and right suspension devices, and the outer peripheral surface of the stabilizer bush is fixed to the mounting portion of the vehicle body and the vehicle body. The present invention relates to a support structure for a stabilizer that is fixed by being pinched with a fixing member.

Fit the shaft hole of the rubber stabilizer bush to the outer periphery of the torsion part of the stabilizer that connects the left and right suspension devices. Patent Document 1 below discloses that a rib (lip) is formed on the sliding surface between the stabilizer bush and the stabilizer to prevent sand particles and muddy water from entering.
Japanese Utility Model Publication No. 4-11710

  By the way, the above-mentioned conventional one is provided with a thin lip at the opening end of the shaft hole of the stabilizer bush. Therefore, if the lip of the stabilizer bush slides with the outer peripheral surface of the torsion portion of the stabilizer over a long period of time, There was a possibility that it would be impossible to prevent sand particles and muddy water from entering due to wear and fracture.

  The present invention has been made in view of the above circumstances, and prevents sand particles and muddy water from entering between the outer peripheral surface of the stabilizer and the inner peripheral surface of the stabilizer bush with a simple and highly durable structure. Objective.

  In order to achieve the above object, according to the invention described in claim 1, the inner peripheral surface of the cylindrical stabilizer bush is fitted to the outer peripheral surface of the torsion portion of the stabilizer connecting the left and right suspension devices, In the stabilizer support structure in which the outer peripheral surface of the stabilizer bush is fixed by being clamped between a mounting portion of the vehicle body and a fixing member fixed to the vehicle body, at least one opening end of the inner peripheral surface of the stabilizer bush has a diameter. A support structure for a stabilizer is proposed in which a chamfered portion that expands outward in the direction is formed.

  According to the invention described in claim 2, in addition to the structure of claim 1, the acute angle formed by the axis of the stabilizer bush 18 and the chamfered portion is 45 ° to 75 °. A stabilizer support structure is proposed.

  According to the invention described in claim 3, in addition to the structure of claim 1, the stabilizer bush includes a slit cut along the axis from the outer peripheral surface to the inner peripheral surface, and the width of the slit is the outer peripheral surface. A stabilizer support structure is proposed which decreases in a wedge shape from the side to the inner peripheral surface side.

  According to the invention described in claim 4, in addition to the configuration of claim 3, the slit is formed by mold forming on the outer peripheral surface side and formed by cutting with a cutter or laser on the inner peripheral surface side. A stabilizer support structure characterized by the above is proposed.

  According to the fifth aspect of the present invention, the inner peripheral surface of the cylindrical stabilizer bush is fitted to the outer peripheral surface of the torsion portion of the stabilizer connecting the left and right suspension devices, and the outer peripheral surface of the stabilizer bush is attached to the vehicle body. The stabilizer bushing includes a slit cut along an axis from the outer peripheral surface to the inner peripheral surface, and the stabilizer bushing includes a slit cut along an axis from the outer peripheral surface to the inner peripheral surface. A stabilizer support structure is proposed, in which a chamfered portion that expands radially outward is formed at least at a position sandwiching the slit at an opening end of at least one inner peripheral surface of the bush.

  In the invention described in claim 5, the chamfered portion may be provided on the entire circumference of the opening end of the inner peripheral surface of the stabilizer bush, or may be provided only at a position sandwiching the slit.

  The first and second outer peripheral surfaces 18a and 18b of the embodiment correspond to the outer peripheral surface of the present invention, and the mounting bracket 21 of the embodiment corresponds to the fixing member of the present invention.

  According to the configuration of the first aspect, the stabilizer bush is fitted to the outer peripheral surface of the torsion portion of the stabilizer and is fixed by being sandwiched between the mounting portion of the vehicle body and the fixing member. Since the chamfered portion that expands radially outward is formed at the opening end of the inner peripheral surface of the stabilizer bush, the stabilizer bush is compressed between the mounting portion of the vehicle body and the fixing member and compressed radially inward. When this is done, a load inward in the axial direction can be generated at the open end of the inner peripheral surface, and the open end can be prevented from opening up. Thereby, it is possible to prevent sand particles and muddy water from entering between the inner peripheral surface of the stabilizer bush and the torsion portion of the stabilizer, and it is possible to prevent generation of noise and wear of the stabilizer. In addition, the stabilizer bush does not have a thin lip, so durability is improved.

  According to the second aspect of the present invention, since the acute angle formed between the axis of the stabilizer bush and the chamfered portion is set to 45 ° to 75 °, the inner peripheral surface is pressed when foreign matter is pressed against the chamfered portion of the stabilizer bush. It is possible to make it difficult for the opening end of the opening to be opened, and to prevent the foreign matter sandwiched between the chamfered portions from being bitten and discharged easily.

  According to the third aspect of the present invention, since the width of the slit obtained by cutting the stabilizer bush along the axis is reduced in a wedge shape from the outer peripheral surface side to the inner peripheral surface side, the stabilizer bush is attached to the mounting portion of the vehicle body and the fixing member. When closing the slit by pinching and fixing between them, a strong contact surface pressure is generated at the tip of the slit communicating with the inner peripheral surface to prevent the generation of a gap and prevent foreign matter from entering through the slit. Can be blocked.

  According to the fourth aspect of the present invention, the outer peripheral surface side of the slit of the stabilizer bush is formed by molding and the inner peripheral surface side is formed by cutting with a cutter or a laser, so that the slit communicates with the inner peripheral surface. It is possible to completely close the slits by preventing the occurrence of burrs.

  According to the fifth aspect of the present invention, the stabilizer bush is fitted to the outer peripheral surface of the torsion portion of the stabilizer and is fixed by being clamped between the mounting portion of the vehicle body and the fixing member. The stabilizer bush is provided with a slit cut along its axis, and at the opening end of the inner peripheral surface of the stabilizer bush, a chamfered portion that expands radially outward is formed at least at a position sandwiching the slit. When the bush is clamped between the mounting part of the vehicle body and the fixing member and compressed inward in the radial direction, an axially inward load is generated at a position sandwiching the slit at the opening end of the inner peripheral surface. It is possible to prevent the opening end from opening up. Thereby, it is possible to prevent sand particles and muddy water from entering between the inner peripheral surface of the stabilizer bush and the torsion portion of the stabilizer, and it is possible to prevent generation of noise and wear of the stabilizer. In addition, the stabilizer bush does not have a thin lip, so durability is improved.

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

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a perspective view showing a state where a stabilizer is attached to a vehicle. FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 3 is a sectional view taken along the line 3-3 in FIG. 2, and FIG. 4 is an explanatory diagram of the action of the chamfered portion of the stabilizer bush.

  As shown in FIG. 1, strut-type suspension devices S, S for suspending left and right wheels W, W include left and right knuckles 11, 11 supported on a vehicle body via suspension arms 10, 10 so as to be movable up and down. Dampers 12 and 12 coupled to the upper portions of the knuckles 11 and 11 and extending upward, suspension springs 13 and 13 disposed coaxially on the outer periphery of the dampers 12 and 12, and upper portions of the left and right knuckles 11 and 11 And a stabilizer 14 for connecting the two.

  The stabilizer 14 smoothes the torsion part 15 linearly extending in the vehicle width direction, the left and right arm parts 16 and 16 extending linearly from both ends of the torsion part 15 to the rear of the vehicle body, and the torsion part 15 and the arm parts 16 and 16. And left and right curved portions 17 connected to each other. The distal ends of the left and right arm portions 16, 16 are connected to the dampers 12, 12 via links 22, 22, respectively. Stabilizer bushes 18, 18 made of cylindrical rubber are fitted to both ends of the torsion portion 15 adjacent to the left and right curved portions 17, 17, and these stabilizer bushes 18, 18 are U-shaped attachments of the vehicle body 19. It is sandwiched and supported between a portion 19a (see FIG. 2) and a plate-like mounting bracket 21 fixed to the vehicle body 19 with bolts 20 and 20 so as to cover the mounting portion 19a.

  As is clear from FIGS. 2 and 3, each stabilizer bush 18 includes a flat first outer peripheral surface 18a, a U-shaped second outer peripheral surface 18b, a pair of side surfaces 18c and 18c, and both side surfaces 18c and 18c. And an inner peripheral surface 18d having a circular cross section that is fitted to the torsion portion 15 of the stabilizer 14. The stabilizer bush 18 is formed with a slit 18e having a split groove shape that is disposed in a plane including the axis L and reaches the inner peripheral surface 18d from the second outer peripheral surface 18b. Further, chamfered portions 18f and 18f that expand outward in the radial direction are formed at both ends in the axis L direction of the inner peripheral surface 18d.

  The stabilizer bush 18 having the shape as described above can be fitted to the outer peripheral surface of the torsion portion 15 of the stabilizer 14 by elastically deforming and widening the slit 18e. Then, the U-shaped second outer peripheral surface 18b of the stabilizer bush 18 is fitted into the U-shaped mounting portion 19a of the vehicle body 19, and the flat first outer peripheral surface 18a is held in contact with the flat mounting bracket 21. The At this time, the stabilizer bush 18 is sandwiched between the vehicle body 19 and the mounting bracket 21 and compressed radially inward with a predetermined tightening allowance, and its inner peripheral surface 18d is pressed against the outer peripheral surface of the torsion portion 15 of the stabilizer 14, And it press-contacts so that the slit 18e may close.

  When the left and right wheels W, W move up and down in the same phase, the stabilizer 14 configured in this way is because the left and right arm parts 16, 16 move up and down in the same phase and the torsion part 15 is not twisted. When the left and right wheels W, W move up and down in opposite phases, but no roll moment is generated, the left and right arm parts 16, 16 move up and down in opposite phases and the torsion part 15 is twisted, so that the rolling of the vehicle body The roll moment which suppresses can be generated and the steering stability of a vehicle can be improved.

  By the way, when a radial external force acts on the stabilizer 14, a gap is generated between the outer peripheral surface of the torsion part 15 and the inner peripheral surface 18 d of the stabilizer bush 18, and sand particles and muddy water enter from there to generate noise and wear. May occur. In the present embodiment, sand particles and muddy water can be prevented from entering by the action of the chamfered portions 18f and 18f formed at both ends of the inner peripheral surface 18d of the stabilizer bush 18 in the axis L direction.

  That is, when the stabilizer bush 18 is sandwiched between the vehicle body 19 and the mounting bracket 21 and compressed radially inward with a predetermined tightening allowance, the stabilizer bush 18 is elastically deformed so as to be pushed outward in the axis L direction, An end portion of the inner peripheral surface 18d in the direction of the axis L is turned up and a gap is generated between the inner peripheral surface 18d and the outer peripheral surface of the torsion portion 15, and sand particles and muddy water may enter from the gap.

  However, by providing the chamfered portions 18f and 18f at the end of the inner circumferential surface 18d of the stabilizer bush 18 in the direction of the axis L, when a compressive load A in the direction perpendicular to the axis L in FIG. An inward load B can be generated, and the surface pressure at which the a portion at the open end of the inner peripheral surface 18d contacts the torsion portion 15 can be increased. As a result, even if a radial load is applied to the torsion portion 15, a gap is prevented from being generated between the outer peripheral surface of the torsion portion 15 and the inner peripheral surface 18 d of the stabilizer bush 18, and sand particles and muddy water are prevented from entering. be able to. In addition, since the stabilizer bush 18 does not have a thin lip, durability is improved.

  The function of the chamfered portions 18f and 18f to prevent sand particles and muddy water from entering varies depending on the magnitude of the acute angle θ formed by the axis L of the stabilizer bush 18 and the chamfered portions 18f and 18f. When the sand particles S are pressed against the chamfered portion 18f in the direction of the axis L by the load F, the load F is decomposed into a component F1 in a direction orthogonal to the chamfered portion 18f and a component F2 in a direction orthogonal to the axis L, The reaction force F2 ′ of the component F2 in the direction orthogonal to the axis L attempts to open the chamfer 18f.

  FIGS. 4A and 4B show cases where the acute angle θ is 65 ° and 35 °, respectively. In the case of FIG. 4A where the acute angle θ is large, the reaction force F2 ′ that pushes and opens the chamfered portion 18f is small, but in the case of FIG. 4B where the acute angle θ is small, the chamfered portion 18f is pushed open. The reaction force F2 'to be increased is increased. Therefore, when the acute angle θ is increased, the foreign matter is less likely to bite into the chamfered portion 18f, and the foreign matter once bited in is easily discharged without staying there. For the above reasons, the lower limit of the acute angle θ is preferably 45 °.

  On the other hand, as described above, when the acute angle θ approaches a right angle, the chamfered portion 18f is pushed out to the outside in the axis L direction by a load for compressing the stabilizer bush 18 radially inward, so that the acute angle θ opens. The upper limit of θ is preferably 75 °. Accordingly, if the acute angle θ is set in the range of 45 ° to 75 °, the opening end of the inner peripheral surface 18d of the stabilizer bush 18 is difficult to open, and the foreign matter bites into the chamfered portion 18f and the bite foreign matter is difficult to be discharged. Can be prevented.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the second embodiment, both ends of the inner circumferential surface 18d of the stabilizer bush 18 of the first embodiment in the direction of the axis L, that is, the small diameter portions 18g and 18g having a reduced inner diameter at the portions connected to the chamfered portions 18f and 18f. Is formed. By forming the small diameter portions 18g and 18g, the surface pressure at which the inner peripheral surface 18d of the stabilizer bush 18 abuts against the outer peripheral surface of the torsion portion 15 is increased, and sand particles and muddy water can be more reliably prevented from entering. .

  Next, a third embodiment of the present invention will be described with reference to FIGS.

  The slit 18e of the stabilizer bush 18 of the first and second embodiments is formed by cutting with a cutter or a laser after forming the stabilizer bush 18, but the stabilizer bush 18 of the third embodiment is formed by the slit. 18e is formed by a combination of mold forming and cutting.

  As shown in FIG. 6, the stabilizer bush 18 has a first bulging portion 18a 'projecting radially outward from the first outer peripheral surface 18a on the slit 18e side, and radially outward from the second outer peripheral surface 18b on the slit 18e side. The second bulging portion 18b 'protrudes. Therefore, when the stabilizer bush 18 is sandwiched between the mounting portion 19a of the vehicle body 19 and the mounting bracket 21, the first and second bulging portions 18a 'and 18b' are compressed so that the slit 18e comes into close contact. Closed to prevent sand particles and muddy water from entering.

  As shown in FIG. 7A, the mold 31 for molding the stabilizer bush 18 is composed of a first mold 32, a second mold 33, and a core 34. The second mold 33 is formed with a wedge-shaped protrusion 33a for forming the slit 18e. The front end of the wedge-shaped projection 33a does not reach the outer peripheral surface of the core 34, and therefore, the front end of the slit 18e of the stabilizer bush 18 does not communicate with the inner peripheral surface 18d when it is formed by the mold 31. After completion of molding by the mold 31, as shown in FIG. 7B, the tip of the slit 18e is completely cut to the inner peripheral surface 18d by a cutter 35 (or laser).

  If it is attempted to form the slit 18e reaching the inner peripheral surface 18d only by molding, it is unavoidable that a burr is generated between the projection 33a of the second mold 33 and the core 34. There is a possibility that the slit 18e is not completely closed and a gap is formed, but by cutting the tip of the slit 18e using the cutter 35, the adhesion of the portion can be improved and foreign matter can be prevented from entering. it can.

  Next, a fourth embodiment of the present invention will be described with reference to FIG.

  In the first to third embodiments described above, the chamfered portions 18f and 18f that expand outward in the radial direction are formed over 360 ° at both ends of the inner peripheral surface 18d of the stabilizer bush 18 in the axis L direction. However, the chamfered portions 18f and 18f of the fourth embodiment are formed only on both side portions sandwiching the slit 18e. The shape of the chamfered portion 18f viewed in the direction of the axis L is tapered in an isosceles triangle shape from the inner peripheral surface 18d of the stabilizer bush 18 toward the radially outer side, and the apex thereof is located on the slit 18e. Therefore, the depth of the chamfered portion 18f is deepest at the position where the slit 18e intersects the inner peripheral surface 18d of the stabilizer bush 18 and gradually becomes shallower radially outward therefrom, and at the same time, gradually toward both sides in the circumferential direction. It is shallow.

  The action of the chamfered portion 18f of the fourth embodiment is the same as that of the annular chamfered portion 18f of the first embodiment, but is expanded by a radial load accompanying torsional deformation of the stabilizer 14. A surface extending over 360 ° of the first to third embodiments while reducing the size of the chamfered portion 18f by providing the chamfered portions 18f on both side portions of the slit 18e that is open and easily invaded by sand grains and muddy water. It is possible to achieve the same function and effect as the take-up portion 18f.

  Next, a fifth embodiment of the present invention will be described with reference to FIG.

  The chamfered portion 18f of the fourth embodiment is formed in an isosceles triangle shape, but the chamfered portion 18f of the fifth embodiment is formed in a crescent shape, and the other configurations are the same. . The function of preventing the intrusion of sand particles and muddy water through the slit 18e is the same in the fourth embodiment and the fifth embodiment, but the fifth embodiment improves the workability during manufacturing. Has the effect of

  That is, as described above, after the stabilizer bush 18 is molded, the slit 18e is processed by the cutter 35 (or laser). At this time, as shown in FIG. 10A, in the case where the isosceles triangular chamfer 18f of the fourth embodiment is provided, the position of the slit 18e is slightly shifted in the circumferential direction. There is a possibility that the function of the chamfered portion 18f may be impaired due to a deviation from the apex of the chamfered portion 18f having an isosceles triangle shape. On the other hand, as shown in FIG. 10B, the crescent chamfered portion 18f according to the fifth embodiment is hardly affected even if the position of the slit 18e is slightly shifted in the circumferential direction. The function of the chamfered portion 18f can be exhibited stably.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the stabilizer 14 according to the embodiment integrally includes the torsion part 15, the arm parts 16, 16 and the bending parts 17, 17, but the arm part 16, which is configured as a separate member at both ends of the linear torsion part 15, 16 may be fixed with a bolt or the like.

  In the embodiment, the strut suspension S is exemplified, but the stabilizer 14 of the present invention can be applied to any type of suspension device.

  Further, in the embodiment, the stabilizer bush 18 is sandwiched and supported between the U-shaped mounting portion 19 a formed on the vehicle body 19 and the flat mounting bracket 21, but the U-shaped mounting is mounted on the flat surface of the vehicle body 19. You may support the stabilizer bush 18 using a bracket.

  In the embodiment, the arm portions 16 and 16 of the stabilizer 14 are connected to the dampers 12 and 12. However, the arm portions 16 and 16 of the stabilizer 14 may be connected to the knuckle 11 and 11 or the suspension arms 10 and 10. .

  In the first to third embodiments, the stabilizer bush 18 includes the linear chamfered portion 18f. However, the chamfered portion 18f does not necessarily have to be linear. In the example of FIG. 11 (A) showing the sixth embodiment of the present invention, the chamfer 18f is curved, and in the example of FIG. 11 (B) showing the seventh embodiment of the present invention, the chamfering is performed. The part 18f is a stepped straight line. In these embodiments as well, if the acute angle formed by the chamfered portion 18f with respect to the axis L in the mounted state of the stabilizer bush 18 is in the range of 45 ° to 75 °, the same as in the first to third embodiments. The effect of this can be achieved.

The perspective view which shows the attachment state to the vehicle of the stabilizer which concerns on the 1st Embodiment of this invention. 2-2 line enlarged sectional view of FIG. 3-3 sectional view of FIG. Action explanatory diagram of chamfered portion of stabilizer bush The longitudinal cross-sectional view of the stabilizer bush which concerns on the 2nd Embodiment of this invention Side view of the stabilizer bush according to the third embodiment of the present invention. Explanatory drawing of manufacturing process of stabilizer bush The figure which shows the stabilizer bush which concerns on the 4th Embodiment of this invention. The figure which shows the stabilizer bush which concerns on the 5th Embodiment of this invention. Action explanatory drawing when processing the slit of the 4th and 5th embodiment of the present invention Vertical sectional view of a stabilizer bush according to sixth and seventh embodiments of the present invention

Explanation of symbols

14 Stabilizer 15 Torsion section 18 Stabilizer bush 18a First outer peripheral surface (outer peripheral surface)
18b Second outer peripheral surface (outer peripheral surface)
18d Inner peripheral surface 18e Slit 18f Chamfer 19 Car body 19a Mounting part 21 Mounting bracket (fixing member)
35 Cutter L Axis S Suspension device

Claims (5)

An inner peripheral surface (18d) of a cylindrical stabilizer bush (18) is fitted to an outer peripheral surface of a torsion portion (15) of a stabilizer (14) connecting the left and right suspension devices (S), and the stabilizer bush (18) In the stabilizer support structure, the outer peripheral surfaces (18a, 18b) of the vehicle body (19) are clamped and fixed between the mounting portion (19a) of the vehicle body (19) and the fixing member (21) fixed to the vehicle body (19).
A stabilizer support structure, wherein a chamfered portion (18f) that expands radially outward is formed on at least one opening end of an inner peripheral surface (18d) of the stabilizer bush (18).   The stabilizer support structure according to claim 1, wherein an acute angle formed by an axis (L) of the stabilizer bush (18) and the chamfered portion (18f) is 45 ° to 75 °.   The stabilizer bush (18) includes a slit (18e) cut along the axis (L) from the outer peripheral surface (18b) to the inner peripheral surface (18d), and the width of the slit (18e) is on the outer peripheral surface (18b) side. The stabilizer support structure according to claim 1, wherein the support structure decreases in a wedge shape toward the inner peripheral surface (18d).   The slit (18e) is formed by die molding on the outer peripheral surface (18b) side, and the inner peripheral surface (18d) side is formed by cutting with a cutter (35) or a laser. Stabilizer support structure. An inner peripheral surface (18d) of a cylindrical stabilizer bush (18) is fitted to an outer peripheral surface of a torsion portion (15) of a stabilizer (14) connecting the left and right suspension devices (S), and the stabilizer bush (18) In the stabilizer support structure, the outer peripheral surfaces (18a, 18b) of the vehicle body (19) are clamped and fixed between the mounting portion (19a) of the vehicle body (19) and the fixing member (21) fixed to the vehicle body (19).
The stabilizer bush (18) includes a slit (18e) cut along the axis (L) from the outer peripheral surface (18b) to the inner peripheral surface (18d),
A chamfered portion (18f) that expands outward in the radial direction is formed at a position sandwiching at least the slit (18e) in at least one opening end of the inner peripheral surface (18d) of the stabilizer bush (18). Stabilizer support structure characterized by

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