JP4832589B2 - Stabilizer support structure - Google Patents

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.

  The shaft hole of the rubber stabilizer bush is fitted to the outer periphery of the torsion part of the stabilizer that connects the left and right suspension devices, and the stabilizer bush is supported on the vehicle body frame by the mounting bracket. The opening end of the shaft hole of the stabilizer bush 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 clamped and fixed between the mounting portion of the vehicle body and a fixing member fixed to the vehicle body, the stabilizer bush is cut along the axis from the outer peripheral surface to the inner peripheral surface. stabilizer and it includes a slit, wherein the only portion sandwiching the previous SL slits that put on at least one open end of the inner peripheral surface of the stabilizer bush, to form a chamfered portion diverging radially outwardly A support structure is proposed.

According to the invention described in claim 2, in addition to the configuration of claim 1, the width of the chamfered portion in the circumferential direction of the stabilizer bush is smaller than the diameter of the inner peripheral surface of the stabilizer bush. A stabilizer support structure characterized by the above is proposed.

According to the invention described in claim 3, in addition to the configuration of claim 1 or 2, the depth of the chamfered portion is the highest at the position where the slit intersects the inner peripheral surface of the stabilizer bush. A stabilizer support structure is proposed which is deeper and gradually becomes shallower from the radial direction of the stabilizer bush toward the outside, and gradually becomes shallower as the distance from the slit increases in the circumferential direction of the stabilizer bush.

The first embodiment, the second outer circumferential surface 18a, 18b corresponds to the outer peripheral surface of the present invention, 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 that is fitted to the outer peripheral surface of the torsion portion of the stabilizer and is clamped and fixed between the mounting portion of the vehicle body and the fixing member is cut along its axis. comprising a slit, only a portion sandwiching the previous SL slits that put the open end of the inner circumferential surface of the stabilizer bush, so to form a chamfered portion for expanding radially outward, the fixed stabilizer bushing and the vehicle body mounting portion When it is pinched between the members and compressed radially inward, an axially inward load is generated at the position sandwiching the slit at the open end of the inner peripheral surface so that the open end is turned up Opening can be prevented. 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.

The perspective view which shows the attachment state to the vehicle of the stabilizer which concerns on the 1st reference form 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 Longitudinal sectional view of the stabilizer bushing according to a second referential embodiment of the present invention Side view of the stabilizer bushing according to a third referential embodiment of the present invention Explanatory drawing of manufacturing process of stabilizer bush The figure which shows the stabilizer bush which concerns on the 1st Embodiment of this invention. The figure which shows the stabilizer bush which concerns on the 2nd Embodiment of this invention. Action explanatory drawing when processing the slits of the first and second embodiments of the present invention Vertical sectional view of a stabilizer bush according to fourth and fifth reference embodiments of the present invention

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

1 to 4 show a first reference embodiment of the present invention. FIG. 1 is a perspective view showing a state in which a stabilizer is attached to a vehicle. FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. FIG. 4 is a sectional view taken along line 3-3 in FIG. 2, and FIG.

  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. The dampers 12 and 12 coupled to the upper portions of the knuckles 11 and 11 and extending upward, the suspension springs 13 and 13 disposed coaxially on the outer periphery of the dampers 12 and 12, and the 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 reference embodiment of the present invention will be described based on FIG.

In the second reference embodiment, small-diameter portions 18g and 18g with reduced inner diameters are provided at both ends of the inner peripheral surface 18d of the stabilizer bush 18 of the first embodiment in the direction of the axis L, that is, the portions continuous to the chamfered portions 18f and 18f. 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 reference embodiment of the present invention will be described based on FIG. 6 and FIG.

The slit 18e of the stabilizer bush 18 of the first and second reference forms is formed by cutting with a cutter or a laser after forming the stabilizer bush 18, but the stabilizer bush 18 of the third reference form has the slit 18e. It 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 first embodiment of the present invention will be described with reference to FIG.

In the first to third reference embodiments described above, the chamfered portions 18f and 18f expanding outward in the radial direction are formed over 360 ° at both ends in the axis L direction of the inner peripheral surface 18d of the stabilizer bush 18. However, the chamfered portions 18f and 18f of the first 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 a position where the slit 18e intersects the inner peripheral surface 18d of the stabilizer bush 18, and from there, gradually becomes shallower toward the radially outer side of the stabilizer bush 18 , and at the same time, It becomes gradually shallower as it moves away from the slit 18e toward both sides in the circumferential direction, that is , in the circumferential direction of the stabilizer bush 18 .

The action of the chamfered portion 18f of the first embodiment is the same as the action of the annular chamfered portion 18f of the first reference embodiment, expansion in radial load due to twisting deformation of the stabilizer 14 Then, by providing chamfered portions 18f on both side portions of the slit 18e where sand particles and muddy water easily enter, the chamfered portions extending 360 ° of the first to third reference forms while miniaturizing the chamfered portion 18f. The effect similar to 18f can be achieved.

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

Although chamfered portion 18f of the second embodiment is formed in an isosceles triangle shape, a chamfered portion 18f of the second embodiment is formed in a crescent shape, other configurations are the same . 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 from there, gradually becomes shallower toward the radially outer side of the stabilizer bush 18, and the stabilizer bush 18 As the distance from the slit 18e increases in the circumferential direction, the depth gradually decreases. The function of preventing the intrusion of sand particles and muddy water through the slit 18e is the same in both the first embodiment and the second embodiment, but the second 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 chamfered portion 18f of the first 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 second embodiment has almost no effect 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.

Although the embodiment and the reference form of the present invention have been described above, 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 reference 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 fourth reference embodiment of the present invention, the chamfer 18f is curved, and in the example of FIG. 11 (B) showing the fifth reference embodiment of the present invention, the chamfer 18f. Is a stepped straight line. Also in these reference forms, 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 effect as the first to third reference embodiments. The effect can be achieved.

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 (3)

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) that connects 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),
Wherein the inner peripheral surface (18 d) of the portion sandwiching at least one of put that before Symbol slit to the open end (18e) of the stabilizer bush (18) only, forming chamfered portions diverging radially outwardly of (18f) A stabilizer support structure characterized by that. The width of the chamfered portion (18f) in the circumferential direction of the stabilizer bush (18) is smaller than the diameter of the inner peripheral surface (18d) of the stabilizer bush (18). Stabilizer support structure. The depth of the chamfered portion (18f) is deepest at a position where the slit (18e) intersects the inner peripheral surface (18d) of the stabilizer bush (18), and from there, the radial direction of the stabilizer bush (18) 3. The stabilizer support structure according to claim 1, wherein the stabilizer support structure gradually becomes shallower toward the outside and becomes gradually shallower as the distance from the slit (18 e) in the circumferential direction of the stabilizer bush (18) is increased. 4.

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