JP5860273B2 - Stabilizer bush and bearing device - Google Patents

Description

  The present invention relates to a bearing device for mounting a stabilizer on a vehicle body, and more particularly to a structure of a stabilizer bush used in this type of bearing device.

  A stabilizer (anti-roll bar) is known as a device that appropriately controls a roll during turning of a vehicle and stabilizes traveling of the vehicle. As shown in FIG. 5, the stabilizer 6 generally has a U shape in which both end portions 61 a and 61 b are bent in the same direction with respect to the central portion 62. Both end portions 61a and 61b are attached to left and right suspensions 8a and 8b provided on front wheels or rear wheels (not shown) via stabilizer links 7a and 7b, respectively. And is mounted on a vehicle body (not shown).

  In such a configuration, when the vehicle turns and a load is applied only to one suspension 8 a or 8 b, twisting occurs in the stabilizer 6, and the spring reaction force of the stabilizer 6 is transmitted to the other suspension 8 b via the bearing device 5. Or it is transmitted to 8a and a roll is controlled appropriately.

  Here, the bearing device 5 slidably holds the movement of the stabilizer 6 in the rotational direction and the like, and serves as a buffer means for preventing vibrations received from the road surface during traveling of the vehicle from being transmitted to the vehicle body via the stabilizer 6. It fulfills the functions of As shown in the figure, the bearing device 5 includes a stabilizer bush 51 in which a through hole 511 for slidably holding the movement of the stabilizer 6 in the rotational direction and the like, and a bracket for fixing the stabilizer bush 51 to the vehicle body. 52.

  In general, the stabilizer bush 51 is made of a rubber material having an excellent anti-vibration function. However, since the rubber bush itself is not a material having a low coefficient of friction, the stabilizer bush 51 using the rubber material is liable to generate a stick-slip phenomenon with respect to the twist of the stabilizer 6 during the turning of the vehicle. May occur. This abnormal noise makes the driver feel uncomfortable.

  Furthermore, since the rubber material has low rigidity, the stabilizer bush 51 may be greatly bent when a large load is applied from the stabilizer 6, and the function of the stabilizer 6 may be delayed. Is included.

  Further, when there is no roll and no twist is generated in the stabilizer 6, the friction coefficient of the sliding contact surfaces of the stabilizer 6 and the stabilizer bush 51 is lower in order to reduce the load on the suspensions 8a and 8b. Is desirable.

  Therefore, in the technique described in Patent Document 1, the stabilizer bush 51 is made of a single thermoplastic resin material such as engineering plastic or thermoplastic elastomer having a lower friction coefficient than the rubber material, instead of the rubber material, thereby stabilizing the stabilizer 6. In addition, the frictional resistance between the stabilizer bushes 51 is reduced to prevent the generation of abnormal noise, and the load on the suspensions 8a and 8b is reduced. Furthermore, since the rigidity becomes higher, the function of the stabilizer 6 is more easily exhibited.

JP 2000-233626 A

  As described above, thermoplastic resins such as engineering plastics and thermoplastic elastomers, which have higher rigidity than rubber materials, also have an advantageous point for exerting the function as the stabilizer 6. It also has the problem of being easily affected. For this reason, when a thermoplastic resin is used for the stabilizer bush 51 as in the technique described in Patent Document 1 instead of the rubber material, the stabilizer bush 51 is easily affected by the dimensional accuracy. The

  That is, when the outer periphery of the stabilizer bush 51 is made larger than a desired dimension with respect to the inner periphery of the bracket 52, when the stabilizer bush 51 inserted into the through hole 511 is fixed to the vehicle body by the bracket 52, When the tightening allowance is larger than the proper amount, the gap between the inner peripheral surface of the through hole 511 and the outer peripheral surface of the stabilizer 6 is smaller than the proper amount, and the frictional resistance between both surfaces is increased. For this reason, when a load is applied to one of the suspensions 8a and 8b, the spring reaction force due to the twist of the stabilizer 6 is absorbed by the stabilizer bush 51 and is not transmitted to the other suspensions 8b and 8a, and the roll cannot be controlled appropriately.

  On the other hand, if the outer periphery of the stabilizer bush 51 is made smaller than a predetermined dimension with respect to the inner periphery of the bracket 52, when the stabilizer bush 51 inserted into the through hole 511 is fixed to the vehicle body by the bracket 52, When the tightening allowance is smaller than the proper amount, the gap between the inner peripheral surface of the bracket 52 and the outer peripheral surface of the stabilizer bush 51 becomes larger than the proper amount, causing rattling, and vibration received from the road surface while the vehicle is traveling is stabilized. It cannot be effectively prevented from being transmitted to the vehicle body via 6.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a structure of a stabilizer bush that does not require high dimensional accuracy even when, for example, a thermoplastic resin having rigidity higher than that of a rubber material is used. is there.

  In order to solve the above-mentioned problem, the present invention is formed so that the inner diameter of both ends of the through hole of the stabilizer bush is smaller than the inner diameter of the both ends in the axial direction of the through hole (for example, in a barrel shape). did.

For example, a first aspect of the present invention is a stabilizer bush used in a stabilizer bearing device,
A cylindrical bush body in which a through hole for slidably holding the stabilizer is formed, and a slit for inserting the stabilizer into the through hole is formed from one end surface to the other end surface;
A buffer portion integrally formed on the outer peripheral surface of the bush body;
A single flange formed to project from the side surface of the bush body ,
The through hole is
The inner diameters of both end portions are formed to be smaller than the inner diameter in the axially inner direction from the both end portions.

The second aspect of the present invention is a stabilizer bush used for a bearing device of a stabilizer,
A cylindrical bush body in which a through hole for slidably holding the stabilizer is formed, and a slit for inserting the stabilizer into the through hole is formed from one end surface to the other end surface;
A buffer part integrally formed on the outer peripheral surface of the bush body,
The through hole is
It is formed so that the inner diameter of both ends is smaller than the inner diameter in the axially inner direction from the both ends.
The bushing body is cylindrical, that have serrations formed on the outer circumferential surface.

  According to the present invention, when the stabilizer bush in which the stabilizer is inserted into the through hole is fixed to the vehicle body with the bracket, the contact between the stabilizer and the stabilizer bush can be limited to the vicinity of both ends of the through hole. For this reason, even if the outer diameter of the stabilizer bush is made larger than that of the conventional shape with respect to the inner diameter of the bracket, the contact area between the stabilizer and the stabilizer bush is smaller than that of the conventional shape, so the tightening margin is small. Since the shape is less affected by the amount, it is possible to keep the frictional resistance between the outer peripheral surface of the stabilizer and the inner peripheral surface of the stabilizer bush small, and keep the frictional resistance with the stabilizer bush due to the rotation of the stabilizer small. be able to.

  Also, even if the outer diameter of the stabilizer bush is made smaller than that of the conventional shape with respect to the inner diameter of the bracket, the inner diameter of both ends of the through hole of the bush body is set smaller than the outer diameter of the stabilizer. Therefore, when the stabilizer bush inserted into the through hole is fixed to the vehicle body with the bracket, even if the tightening allowance is smaller than the conventional amount, the bracket inner periphery and the stabilizer bush outer periphery Therefore, it is possible to effectively prevent the vibration received from the road surface during traveling of the vehicle from being transmitted to the vehicle body via the stabilizer.

  As described above, according to the present invention, for example, even when a thermoplastic resin having a higher rigidity than that of a rubber material is used, it is possible to provide a structure of a stabilizer bush that does not require high dimensional accuracy compared to a conventional shape. In addition, since the stabilizer bush and stabilizer can be contacted with tightening margins at both ends of the through-hole, foreign matter such as mud and sand enters the gap between the through-hole and the stabilizer and generates noise. Therefore, it is possible to provide a stabilizer bush structure having a sealing function that can effectively prevent this.

FIG. 1 is a component development view of a bearing device according to an embodiment of the present invention. 2A to 2C are a front view, a rear view, and a top view of the stabilizer bush 1, and FIG. 2D is a cross-sectional view taken along line AA in FIG. 2A. FIG. 3 is an exploded view of parts of a modified example of the bearing device according to the embodiment of the present invention. FIG. 4 is a component development view of a modified example of the bearing device according to the embodiment of the present invention. FIG. 5 is a diagram for explaining a schematic configuration of the stabilizer.

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

  FIG. 1 is a component development view of a bearing device according to an embodiment of the present invention.

  The bearing device according to the present embodiment slidably holds the movement of the stabilizer 6 (see FIG. 5) in the rotational direction and the like, and vibrations received from the road surface while the vehicle is traveling are transmitted to the vehicle body via the stabilizer 6. It serves as a buffer means for preventing the above. As shown in the figure, the bearing device includes a bracket 2 and a stabilizer bush 1.

  The bracket 2 is for fixing the stabilizer bush 1 to the vehicle body, and is formed with an accommodating portion 21 for accommodating the stabilizer bush 1 and through holes 221a and 221b for bolting the bracket 2 to the vehicle body. Flanges 22a and 22b.

  On the other hand, the stabilizer bush 1 slidably holds the movement of the stabilizer 6 in the rotational direction and the like, and prevents the vibration of the stabilizer 6 from being transmitted to the vehicle body. 2A to 2C are a front view, a rear view, and a top view of the stabilizer bush 1, and FIG. 2D is a cross-sectional view taken along line AA in FIG. 2A.

  As shown in the drawing, the stabilizer bush 1 includes a cylindrical bush body 11 and a rectangular buffer portion 12 formed integrally with the bush body 11.

  The bush body 11 is formed with a through hole 111 for slidably holding the movement of the stabilizer 6 in the rotational direction. The through-hole 111 is formed in a barrel shape in which the internal space shape swells from the both ends 116a, 116b to the center of the axial interior 117, and therefore, the inner diameter r1 of the both ends 116a, 116b It is smaller than the inner diameter r2 in the region 301 of the axially inner portion 117 sandwiched between 116a and 116b. In FIG. 2D, the inner diameter r2 indicates the maximum value in the region 301 of the axially inner portion 117.

  Further, the inner diameter r1 of the both end portions 116a and 116b is smaller than the outer diameter r5 (see FIG. 5) of the stabilizer 6, and the inner diameter r2 in the region 301 of the axially inner 117 is larger than the outer diameter r5 of the stabilizer 6. For this reason, the stabilizer bush 1 is set with a tightening margin with respect to the bracket 2, but even in the set state, the region 301 of the axially inner portion 117 is not in contact with the stabilizer 6. The stabilizer 6 supports the stabilizer 6 at two points of both end portions 116a and 116b of the through hole 111.

  In the present embodiment, the inner diameter r1 of the both end portions 116a and 116b is made smaller than the outer diameter r5 of the stabilizer 6. However, the inner diameter r1 is set to be larger than the outer diameter r5 of the stabilizer 6, and the bracket 2 However, the inner diameter r1 of the both end portions 116a and 116b may generate a tightening margin with respect to the outer diameter r5 of the stabilizer 6 when set in a state with a tightening allowance.

  A serration 114 is formed on the outer peripheral surface 119 of the bush body 11 in the direction of the axis α of the through hole 111. The outer diameter r3 of the bushing body 11 between the tops of the opposing peak portions of the serration 114 has a tightening margin with respect to the inner diameter r4 (see FIG. 1) of the housing portion 21 of the bracket 2. By providing the serration 114, when the bracket 2 is set with a tightening margin, the influence of the dimensional accuracy of the outer diameter r3 of the bushing body 11 on the inner diameter r1 of the both end portions 116a and 116b of the through hole 111 is reduced. be able to.

  In addition, a single flange 115 projecting from the outer peripheral surface 119 in the outer peripheral direction is formed on the outer peripheral surface 119 on the one end surface 118 a side of the bush main body 11. The flange 115 has a function of positioning the stabilizer bush 1 relative to the bracket 2 by abutting against one end surface 211 of the accommodating portion 21 when the stabilizer bush 1 is accommodated in the accommodating portion 21 of the bracket 2.

  In the bush main body 11, a slit 112 connected from the outer peripheral surface 119 to the inner peripheral surface 302 is formed in the direction of the axis α of the through hole 111 from one end surface 118a to the other end surface 118b. By opening the slit 112 and sandwiching the stabilizer 6 between the stabilizer bushes 1, the stabilizer 6 is inserted into the through hole 111 of the bush body 11. In addition, a groove (cut) 113 for making the slit 112 easy to open is formed on the outer peripheral surface 119 opposite to the slit 112 across the axis α.

  The shock absorber 12 accommodates the stabilizer bush 1 in the housing portion 21 of the bracket 2 from the serration 114 side, and when the bracket 2 is fixed to the vehicle body, the bush 12 is disposed between the vehicle body and the bush body 11. It is formed integrally with the main body 11.

  The upper surface 121 of the buffer portion 12 is a contact surface with the vehicle body, and when the stabilizer bush 1 is accommodated in the accommodating portion 21 of the bracket 2, the upper surface 121 slightly protrudes from the flanges 22 a and 22 b of the bracket 2. Formed.

  Moreover, the buffer part 12 is formed with recesses 122, and the rigidity of the stabilizer bush 1 can be adjusted by changing the number, size, and shape of the recesses 122. Moreover, by providing the recess 122 in the buffer portion 12, it is possible to expect a cost reduction due to a reduction in the amount of material used for the stabilizer bush 1. In the present embodiment, four recesses 122 are provided, but at least one recess 122 is provided depending on the required rigidity of the stabilizer bush 1 and the size, shape, etc. of the recess 122. It only has to be done.

  As the material of the stabilizer bush 1, a thermoplastic resin material such as engineering plastic or thermoplastic elastomer having higher rigidity than a general rubber material excellent in vibration-proof function can be used.

  In particular, a resin material in which a predetermined amount of fatty acid, metal soap, phosphate, and lubricating oil are blended with a polyester elastomer, and a silicone lubricant or a Teflon (registered trademark) lubricant is added to the polyester elastomer. The resin material is suitable as a material for the stabilizer bush 1 because it has higher rigidity than the rubber material, has excellent sliding characteristics (low friction), and can achieve the same vibration-proof function as the rubber material.

  The embodiment of the present invention has been described above.

  In the present embodiment, the through hole 111 provided in the bushing body 11 of the stabilizer bush 1 has an inner diameter r1 of both end portions 116a and 116b larger than an inner diameter r2 in the region 301 of the inner 117 sandwiched between the both end portions 116a and 116b. Since the stabilizer bush 1 having the stabilizer 6 inserted in the through hole 111 is fixed to the vehicle body with the bracket 2, the contact between the stabilizer 6 and the stabilizer bush 1 is caused by the through hole 111. Are limited to the vicinity of both ends 116a, 116b.

  For this reason, even if the outer diameter of the stabilizer bush 1 is made larger than the inner diameter of the accommodating portion 21 of the bracket 2 and the bracket 6 is tightened, the frictional resistance between the stabilizer 6 and the stabilizer bush 1 can be kept small. Thus, the torque transmitted to the stabilizer bush 1 by the rotation of the stabilizer 6 can be reduced.

  Further, even if the outer diameter of the stabilizer bush 1 is made smaller than the inner diameter of the housing portion 21 of the bracket 2 and the tightening allowance is small, the gap between the inner peripheral surface of the bracket 52 and the outer peripheral surface of the stabilizer bush 51 is small. Therefore, it is possible to effectively prevent the vibration received from the road surface during the traveling of the vehicle from being transmitted to the vehicle body via the stabilizer 6.

  Thereby, for example, even when a resin material having higher rigidity than a rubber material is used, a structure of the stabilizer bush 1 that does not require high dimensional accuracy can be provided.

  Further, since the stabilizer bush 1 and the stabilizer 6 are brought into contact with each other at both end portions 116a and 116b of the through hole 111, for example, mud, sand or the like is caused between the through hole 111 and the stabilizer 6 during traveling of the vehicle. It is possible to provide the structure of the stabilizer bush 1 having a sealing function that can effectively prevent the noise from entering the gap.

  In the present embodiment, serrations 114 are formed on the outer peripheral surface 119 of the bushing body 11 of the stabilizer bush 1 in the direction of the axis α of the through hole 111, and the bushing body between the tops of the opposing mountain portions of the serrations 114. The outer diameter r3 of 11 is given an allowance relative to the inner diameter r4 of the accommodating portion 21 of the bracket 2. For this reason, even when a resin material having higher rigidity than the rubber material is used, the influence of the dimensional accuracy of the outer diameter r3 of the bush body 11 on the dimensional accuracy of the inner diameter r4 of the housing portion 21 of the bracket 2 can be reduced. The structure of the stabilizer bush 1 that does not require higher dimensional accuracy can be provided.

  In the present embodiment, a single flange 115 projecting from the outer peripheral surface 119 is formed in the bush body 11 of the stabilizer bush 1, and a slit 112 for inserting the stabilizer 6 into the through hole 111 is provided in the bush body. 11 from one end face 118a to the other end face 118b in the same direction as the serration 114 (the direction of the axis α of the through hole 111). For this reason, even when the through hole 111 is formed in a barrel shape, a stabilizer is used by using a two-plate mold consisting only of an upper mold (movable mold) and a lower mold (fixed mold) that move in the direction of the axis α of the through hole 111 The bush 1 can be molded. As described above, according to the present embodiment, since it is not necessary to use a mold having a complicated configuration such as a split mold (slip mold), the cost can be reduced by simplifying the mold structure.

  Moreover, in this Embodiment, the recessed part 122 is formed in the buffer part 12 of the stabilizer bush 1 in the same direction as the serration 114 (direction of the axis α of the through hole 111). By changing the number, size, and shape of the recesses 122, the rigidity of the stabilizer bush 1 can be adjusted, and the cost can be reduced by reducing the amount of material used for the stabilizer bush 1.

  In the present embodiment, the single flange 115 is formed on the outer peripheral surface 119 on the one end face 118a side of the bush body 11 of the stabilizer bush 1, but the formation position of the flange 115 is limited to this. It is not something. What is necessary is just to form the single flange 115 so that it may protrude from the outer peripheral surface 119 of the bush main body 11 to an outer peripheral direction. For example, like the stabilizer bush 1a shown in FIG. 3, you may form the single flange 115a in the outer peripheral surface 119 near the center of the bush main body 11. FIG. Here, an example in which the flange 115a is formed so as to reach the buffer portion 12 across the slit 112 is shown. An engagement groove 212 is provided in the bracket 2a for engaging with the flange 115a when the stabilizer bush 1a is accommodated in the accommodating portion 21.

  Further, in the present embodiment, a single flange 115 is formed on the outer peripheral surface 119 on the one end surface 118a side of the bush body 11 of the stabilizer bush 1, and the serration 114 and the concave portion 122 are connected to the axis α of the through hole 111. It is formed in the direction. However, the present invention is not limited to this. For example, as in the stabilizer bush 1b shown in FIG. 4, flanges 115b are formed on the outer peripheral surfaces 119 on the both end surfaces 118a and 118b side of the bush main body 11, and the serration 114a and the recess 122a are connected to the axis α of the through-hole 111. You may make it form in a perpendicular | vertical direction (radial direction). However, in this case, a complicated mold such as a split mold is required for molding the stabilizer bush 1b.

  Moreover, in this Embodiment, although the through-hole 111 provided in the bush main body 11 of the stabilizer bush 1 is formed in the barrel shape, this invention is not limited to this. The through hole 111 may have any shape as long as the inner diameter r1 of the both end portions 116a and 116b is smaller than the inner diameter r2 in the region 301 of the inside 117 sandwiched between the both end portions 116a and 116b.

  DESCRIPTION OF SYMBOLS 1, 1a, 1b: Stabilizer bush 2, 2a: Bracket, 6: Stabilizer, 7a, 7b: Stabil link, 8a, 8b: Suspension, 11: Bush body, 12: Buffer part, 61a, 61b: Both ends of stabilizer 6 Part, 62: central part of the stabilizer 6, 111: through hole, 112: slit, 113: groove, 114, 114a: serration, 115, 115a, 115b: flange, 116a, 116b: end part of the through hole 111, 117: Inside of the through-hole 111, 118a, 118b: end surface of the bush body 11, 119: outer peripheral surface of the bush body 11, 121: upper surface of the buffer portion 12, 122, 122a: recess, 21: housing portion, 22a, 22b: flange, 211: End surface of the accommodating part 21, 212: Engaging groove, 221a, 221b: Through-hole, 301: Region inside 117 of the hole 111, 302: inner circumferential surface of the bush main body 11

Claims (9)

A stabilizer bush used for a bearing device of a stabilizer,
A cylindrical bush body in which a through hole for slidably holding the stabilizer is formed, and a slit for inserting the stabilizer into the through hole is formed from one end surface to the other end surface;
A buffer portion integrally formed on the outer peripheral surface of the bush body;
A single flange formed to project from the side surface of the bush body ,
The through hole is
A stabilizer bushing characterized in that the inner diameter of both ends is smaller than the inner diameter in the axially inner direction from both ends . A stabilizer bush used for a bearing device of a stabilizer,
A cylindrical bush body in which a through hole for slidably holding the stabilizer is formed, and a slit for inserting the stabilizer into the through hole is formed from one end surface to the other end surface;
A buffer part integrally formed on the outer peripheral surface of the bush body,
The through hole is
It is formed so that the inner diameter of both ends is smaller than the inner diameter in the axially inner direction from the both ends.
The stabilizer bush characterized by the above-mentioned bush main body being cylindrical, and the serration being formed in the outer peripheral surface. The stabilizer bush according to claim 1 or 2 ,
The stabilizer bush, wherein the through hole is formed in a barrel shape. The stabilizer bush according to any one of claims 1 to 3,
In the bush body,
A stabilizer bush, wherein a groove is formed on an outer peripheral surface opposite to the slit through the through hole. The stabilizer bush according to any one of claims 1 to 4 ,
The stabilizer bush is formed with a recess for adjusting rigidity. The stabilizer bush according to any one of claims 1 to 5 ,
An elastomer resin material is used as a material for the stabilizer bush. The stabilizer bush according to any one of claims 1 to 6 ,
The inner diameter of the both end portions of the through hole is smaller than the outer diameter of the bar portion of the stabilizer inserted into the through hole, and the inner diameter of the through hole in the axially inward direction from the both end portions is the same as that of the stabilizer. A stabilizer bush characterized by being larger than the outer diameter of the bar portion . The stabilizer bush according to claim 7 ,
The stabilizer bushing which contacts with the bar part of the stabilizer inserted into the through-hole at both ends of the through-hole . A stabilizer bearing device,
The stabilizer bush according to any one of claims 1 to 8 ,
And a bracket for fixing the stabilizer bush holding the stabilizer.

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