JP2007022343A - Method for manufacturing stabilizer bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a stabilizer bush which facilitates a reduction in the sliding resistance of the stabilizer bush to a stabilizer bar because the trouble caused by wrinkles produced on a liner fixed to the inside peripheral surface of the stabilizer bush can be avoided. <P>SOLUTION: The rubber cylinder shape stabilizer bush 1 having a liner 7 fixed to its inside peripheral surface 1a is manufactured by forming a cavity C between an outside die 10 and an inside die 14, and by supplying a rubber compound 27 into the cavity C, wherein a first supply port 31 and a second supply port 32 are formed in a first outside die portion 17 so as to face to the radially inside L of the cavity C, and a third supply port 33 and a fourth supply port 34 are formed in a second outside die portion 18 so as to face to the radially inside L of the cavity C, and the rubber compound 27 is supplied from the first supply port 31, the second supply port 32, the third supply port 33, and the fourth supply port 34 respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention
A cavity corresponding to the cylindrical stabilizer bush is formed between the outer mold and the middle mold with a liner on the outer peripheral surface, and the rubber compound is supplied to the cavity, so that the liner is fixed to the inner peripheral surface. The present invention relates to a method for manufacturing a rubber cylindrical stabilizer bush.

  A stabilizer bar of the vehicle is inserted into the stabilizer bush, and the stabilizer bush is pressed and fixed to the vehicle body by a clamp in the inserted state. However, in this mounting structure, when the vehicle is started, the inner peripheral surface of the stabilizer bush and the stabilizer bar may suddenly be relatively displaced to generate noise. Therefore, a stabilizer bush has been proposed in which a liner is fixed to the inner peripheral surface to reduce sliding resistance with respect to the stabilizer bar (see Patent Document 1).

Conventionally, as a method of manufacturing a rubber cylindrical stabilizer bush having a liner fixed to an inner peripheral surface, from one end side in the axial direction of the cavity (that is, one end side of a ring-shaped space between an outer mold and a middle mold) There was a means for supplying the rubber compound toward the other end side.
JP-A-2005-88828

  According to the above conventional means, the pressure of the rubber compound on one end side of the cavity in the axial direction is strong, and the liner attached to the middle mold is pushed in the axial direction and the liner may be wrinkled. When such wrinkles approach, it becomes difficult to reduce the sliding resistance of the stabilizer bush with respect to the stabilizer bar.

  The present invention has been made in view of the above circumstances, and its purpose is to avoid the problem that the liner fixed to the inner peripheral surface of the stabilizer bush becomes wrinkled, and the sliding resistance of the stabilizer bush against the stabilizer bar. It is in the point of providing the method which can make it easy to reduce and can manufacture the stabilizer bush which is easy to prevent generation | occurrence | production of abnormal noise.

The feature of the present invention is that
A cavity corresponding to the cylindrical stabilizer bush is formed between the outer mold and the middle mold with a liner on the outer peripheral surface, and the rubber compound is supplied to the cavity, so that the liner is fixed to the inner peripheral surface. A method of manufacturing a rubber cylindrical stabilizer bush,
A first supply port and a second supply port for supplying a rubber compound facing the radially inner side of the cavity are formed in a first outer mold portion located on one end side in the axial direction of the cavity. In addition, a third supply port and a fourth supply port for supplying a rubber compound facing the radially inner side of the cavity are formed in the second outer mold portion located on the other end side in the axial direction of the cavity. In addition, the stabilizer bush is manufactured by supplying the rubber compound to the cavity from the first supply port, the second supply port, the third supply port, and the fourth supply port.

  That is, the first supply port and the second supply port are formed in the first outer mold portion located on one end side in the axial direction of the cavity, and face the radially inner side of the cavity. The supply port and the fourth supply port are formed in the second outer mold portion located on the other end side in the axial direction of the cavity and face the radially inner side of the cavity. According to the above means, since the rubber compound is supplied from such first to fourth supply ports, for example, means for supplying the rubber compound from one end side to the other end side in the axial direction of the cavity. As compared with, the supply pressure of the rubber compound from each supply port can be reduced. Moreover, since the rubber compound is supplied from the first to fourth supply ports to the radially inner side of the cavity, it is compared with the means for supplying the rubber compound from one end side to the other end side in the axial direction of the cavity. Thus, the pressure of the rubber compound in the axial direction can be reduced, and the wrinkles in the axial direction on the liner attached to the outer peripheral surface of the middle mold can be avoided.

In the present invention,
The first supply port and the second supply port are formed in the first outer mold portion in a state of being sandwiched between the cavity cores, and the third supply port and the fourth supply port are If the second outer mold part is formed in a state of being sandwiched between the cavity cores, the first to fourth supply ports can be dispersed in the axial direction and the circumferential direction of the cavity. The pressure of the rubber compound in the direction can be reduced.

In the present invention,
The stabilizer bush has a first flange at one end in the axial direction of the stabilizer bush and a second flange at the other end, and the first outer mold portion corresponds to the top surface of the first flange. When the second outer mold portion is an outer mold portion corresponding to the top surface of the second flange, the first to fourth supply ports can be positioned farthest from the liner in the radial direction of the cavity. Thus, the pressure of the rubber compound in the axial direction on the liner side can be further reduced. As a result, it can be more easily avoided that the liner is wrinkled in the axial direction.

In the present invention,
The outer mold is divided into an upper mold and a lower mold in a direction corresponding to the radial direction of the stabilizer bush, and the first supply port, the second supply port, the third supply port, and the fourth supply port are If the upper die mating surface and the lower die mating surface are formed of a pair of grooves that overlap each other, the die surface and the groove can be machined with the same machine tool, and the machining cost can be reduced.

In the present invention,
When the liner is made of Teflon fiber (registered trademark), sliding resistance of the stabilizer bush with respect to the stabilizer bar can be easily reduced.

  According to the present invention, it is possible to avoid the problem that the liner fixed to the inner peripheral surface of the stabilizer bush becomes wrinkled, and it is possible to easily reduce the sliding resistance of the stabilizer bush with respect to the stabilizer bar. It was possible to provide a method capable of manufacturing a stabilizer bush that is easy to prevent the occurrence.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
The stabilizer bush 1 manufactured with the manufacturing method of this invention is shown in FIGS. 1-3. A liner 7 is fixed to the inner peripheral surface 1 a of the stabilizer bush 1. The liner 7 is made of Teflon fiber (registered trademark). The stabilizer bush 1 is formed in a rubber cylinder shape having a U-shaped outer peripheral surface 2 and a linear flat surface 3 continuous to both ends of the U-shaped outer peripheral surface 2, and is attached to one end portion 1A of the stabilizer bush 1 in the axial direction J1. The first flange 4 and the second flange 5 are formed on the other end 1B. A cutting groove 6 for mounting along the radial direction and the axial direction is formed in the stabilizer bush 1. A metal bar-shaped stabilizer bar is inserted into the stabilizer bush 1, the stabilizer bush 1 is pressed and fixed to the vehicle body side with a clamp, and the flat surface 3 of the stabilizer bush 1 is pressed against the mounting surface of the vehicle body.

  As shown in FIGS. 4 to 9, a cavity C corresponding to the cylindrical stabilizer bush 1 is formed between the outer mold 10 and the middle mold 14 having the liner 7 attached to the outer peripheral surface 14 a, and rubber is formed in the cavity C. By supplying the blend 27, the rubber cylindrical stabilizer bush 1 having the liner 7 fixed to the inner peripheral surface 1a is manufactured. In the present embodiment, two stabilizer bushes 1 that are continuous in the axial direction J1 are formed at a time. After the molding, the two stabilizer bushes 1 are cut and separated, and the cutting groove 6 is formed by a cutting blade.

  The outer die 10 is divided into two, an upper die 11 and a lower die 12 in a direction H corresponding to the radial direction K of the stabilizer bush 1. C1 is a cavity part on the upper mold 11 side, and C2 is a cavity part on the lower mold 12 side. The upper mold 11 includes a disk-shaped upper mold main body 20, and a mold surface 22 is formed at the radial center of the upper mold main body 20. Reference numeral 28 in FIG. 5 denotes a rectangular mating surface on the upper mold 11 side. The lower mold 12 also includes a disk-shaped lower mold main body 21, and a mold surface 23 is formed at the radial center of the lower mold main body 21. Reference numeral 29 in FIG. 6 is a rectangular mating surface on the lower mold 12 side. The upper mold 11 and the lower mold 12 are each provided with a frustoconical fitting concave portion 24 and a fitting portion 25 that are fitted to each other, and a plurality of concave portions 26 having an arcuate cross section for fitting the middle die 14. I have.

  A first supply port 31 and a second supply port 32 facing the radially inner side L of the cavity C are formed in the first outer mold portion 17 located on the one end portion 16A side in the axial direction J2 of the cavity C, and the cavity A third supply port 33 and a fourth supply port 34 facing the radially inner side L of the cavity C are formed in the second outer mold portion 18 located on the other end portion 16B side in the axial direction J2 of C. . The first supply port 31 and the second supply port 32 are located with the axis O of the cavity C in between, and the third supply port 33 and the fourth supply port 34 are also located with the axis O of the cavity in between.

  The first outer mold portion 17 is an outer mold portion corresponding to the top surface 4 </ b> A of the first flange 4, and the second outer mold portion 18 is an outer mold portion corresponding to the top surface 5 </ b> A of the second flange 5. The first supply port 31, the second supply port 32, the third supply port 33, and the fourth supply port 34 are respectively formed on the mating surface 28 of the upper mold 11 and the mating surface 29 of the lower mold 12, respectively. It consists of a pair of overlapping grooves 31A, 31B (32A, 32B), (33A, 33B), (34A, 34B).

  The first supply port 31 and the third supply port 33 communicate with each other via the first communication part 15 along the axial direction J2 of the cavity C, and the second supply port 32 and the fourth supply port 34 communicate with the shaft. It communicates through the second communication part 30 along the core direction J2. The first communication portion 15 includes a pair of grooves 15A and 15B that are formed on the mating surface 28 of the upper mold 11 and the mating surface 29 of the lower mold 12 and overlap each other, and the second communication portion 30 is formed of the upper mold 11. And a pair of grooves 30A and 30B which are formed on the mating surface 28 of the lower mold 12 and overlap each other.

  On the upper mold 11 side, a first communication hole 35 communicating with the longitudinal intermediate portion of the first communication portion 15 via the third communication portion 37 is formed, and a second communication portion via the fourth communication portion 38 is formed. A second communication hole 39 that communicates with the intermediate portion in the longitudinal direction of 30 is formed. The third communication portion 37 includes a pair of mutually overlapping grooves 37A and 37B formed on the mating surface 28 of the upper die 11 and the mating surface 29 of the lower die 12, and the fourth communication portion 38 is provided on the upper die 11. And a pair of grooves 38A and 38B which are formed on the mating surface 28 of the lower mold 12 and overlap each other. The rubber compound is supplied to the first communication hole 35 and the second communication hole 39 from the rubber compound supply device on the outer side of the outer mold. Reference numeral 36 in FIG. 6 denotes a burr forming groove for forming a thin burr. The burr formed in the burr forming groove 36 is removed after the stabilizer bush is formed.

The stabilizer bush 1 is manufactured as follows using the outer mold 10 and the middle mold 14 having the above structure.
(1) The liner 7 is formed in a cylindrical shape, and the liner 7 is attached to the intermediate die 14 by inserting the intermediate die 14 into the liner 7 so that the intermediate die 14 is covered with the liner 7.
(2) The upper mold 11, the lower mold 12, and the middle mold 14 to which the liner 7 is attached are assembled together. (3) The rubber compound 27 is supplied from the first supply port 31, the second supply port 32, the third supply port 33, and the fourth supply port 34 toward the radially inner side L of the cavity C.

Side view of stabilizer bush Bottom view of stabilizer bush Front view of stabilizer bush Longitudinal sectional view showing outer mold and medium mold View of upper mold surface from below (bottom view of upper mold) View of lower mold surface from above (plan view of lower mold) AA sectional view of FIG. BB sectional view of FIG. Diagram showing outer and middle molds

Explanation of symbols

1 Stabilizer bush 1A One end of the axial direction (one end of the stabilizer bush in the axial direction)
1a Inner peripheral surface (inner peripheral surface of stabilizer bush)
1B The other end in the axial direction (the other end in the axial direction of the stabilizer bush)
2 U-shaped outer peripheral surface 3 Flat surface 4 First flange 4A Top surface of first flange 5 Second flange 5A Top surface of second flange 6 Cutting groove 7 Liner (Teflon fiber (registered trademark))
DESCRIPTION OF SYMBOLS 10 Outer type 11 Upper type 12 Lower type 13 Abbreviation 14 Medium type 14a Middle type outer peripheral surface 15, 15 1st communication part 15A, 15A, 15B, 15B Groove (groove of 1st communication part)
16A, 16A One end of the cavity in the axial direction 16B, 16B The other end of the cavity in the axial direction 17, 17, 17, 17 First outer mold part (outer mold part)
18, 18, 18, 18 Second outer mold part (outer mold part)
20 Upper mold body portion 21 Lower mold body portion 22, 22 Upper mold surface 23, 23 Lower mold surface 24 Fitting recess 25 Fitting portion 26, 26 Recess 27, 27 Rubber compound 28 Matching surface of upper mold 29 Lower mold mating surface 30, 30 Second communication portion 30A, 30A, 30B, 30B Groove (groove of second communication portion)
31, 31 First supply port 31A, 31A, 31B, 31B Groove (groove of the first supply port)
32, 32 Second supply port 32A, 32A, 32B, 32B Groove (groove of the second supply port)
33, 33 Third supply port 33A, 33A, 33B, 33B Groove (groove of third supply port)
34, 34 Fourth supply port 34A, 34A, 34B, 34B Groove (groove of fourth supply port)
35, 35 First communication hole 36, 36 Burr forming groove 37, 37 Third communication part 37A, 37A, 37B, 37B groove (groove of third communication part)
38, 38 4th communication part 38A, 38A, 38B, 38B Groove (groove of the 4th communication part)
39, 39 Second communication hole A, A Reference sign indicating AA cross section B, B Reference sign indicating BB cross section C Cavity C1 Upper mold side cavity part C2 Lower mold side cavity part H In the radial direction of the stabilizer bush Corresponding direction J1 Stabilizer bushing axial direction J2, J2 Cavity axial direction K Stabilizer bushing radial direction L, L, L, L Cavity radial inner side O Cavity axial center

Claims (5)

A cavity corresponding to the cylindrical stabilizer bush is formed between the outer mold and the middle mold with a liner on the outer peripheral surface, and the rubber compound is supplied to the cavity, so that the liner is fixed to the inner peripheral surface. A method of manufacturing a rubber cylindrical stabilizer bush,
A first supply port and a second supply port for supplying a rubber compound facing the radially inner side of the cavity are formed in a first outer mold portion located on one end side in the axial direction of the cavity. In addition, a third supply port and a fourth supply port for supplying a rubber compound facing the radially inner side of the cavity are formed in the second outer mold portion located on the other end side in the axial direction of the cavity. In addition, a stabilizer bushing manufacturing method for manufacturing the stabilizer bushing by supplying the rubber compound to the cavity from the first supply port, the second supply port, the third supply port, and the fourth supply port.   The first supply port and the second supply port are formed in the first outer mold portion in a state of being sandwiched between the cavity cores, and the third supply port and the fourth supply port are The manufacturing method of the stabilizer bush of Claim 1 formed in the said 2nd outer type | mold part in the state located on both sides of the axial center of a cavity.   The stabilizer bush has a first flange at one end in the axial direction of the stabilizer bush and a second flange at the other end, and the first outer mold portion corresponds to the top surface of the first flange. The method of manufacturing a stabilizer bush according to claim 1 or 2, wherein the second outer mold portion is an outer mold portion corresponding to a top surface of the second flange.   The outer mold is divided into an upper mold and a lower mold in a direction corresponding to the radial direction of the stabilizer bush, and the first supply port, the second supply port, the third supply port, and the fourth supply port are The manufacturing method of the stabilizer bush as described in any one of Claims 1-3 which consists of a pair of mutually overlapping groove | channel formed in the mating surface of the said upper mold | type separately, and the mating surface of a lower mold | type.   The manufacturing method of the stabilizer bush as described in any one of Claims 1-4 in which the said liner consists of a Teflon fiber (trademark).

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