JP2007331573A - Stabilizer bush manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and highly-precisely specify positions where creases occur on the outer peripheral face of a liner. <P>SOLUTION: A stabilizer bush manufacturing method is used for forming a stabilizer bush 10 that supports a stabilizer bar, provided in a vehicle, with a bearing hole 20 in which the liner 42 is fixed on its inner peripheral face. The method has an insert molding step in which the liner 42 is inserted into a cavity 70 in a state of protruding the liner 42 from the inside of the cavity 70 to both sides of the front side (A) and the rear side (B) in an injection direction of a rubber-like elastic material, a rubber-like elastic part 12a is injection-molded by inserting the part protruded to the front side (A) in the injection direction from the inside of the cavity 70 in the liner 42 into a ring-like damming plate 62, and the stabilizer bush 10 is formed by cutting the part inserted into the damming plate 62 and a part located in-between the cavity 70 in the liner 42 after through a vulcanization step. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a stabilizer bush that supports a stabilizer bar provided in a vehicle.

In general, a vehicle is provided with a stabilizer bar made of, for example, spring steel in order to suppress the roll angle of the vehicle body when turning or to improve the riding comfort when traveling straight ahead. As a stabilizer bush for supporting the stabilizer bar, for example, a rubber-like elastic body having a bearing hole in which a liner is fixed to an inner peripheral surface as shown in Patent Document 1 below is known. In a state where a cylindrical liner fitted with a support pin is inserted into the cavity, a rubber-like elastic material is injected along the central axis direction onto the outer peripheral surface of the liner, and a rubber-like material is injected onto the outer peripheral surface of the liner. It is formed by going through an insert molding step for injection molding of the elastic portion and a vulcanization step for vulcanizing the rubber-like elastic portion to form a rubber-like elastic body in this order. Here, in the insert molding process, the fibers constituting the outer peripheral surface side of the liner are caused to flow toward the front side in the injection direction of the rubber-like elastic material due to the injection pressure of the rubber-like elastic material. After the process, the liner is cut to remove the wrinkles.
JP 2001-221284 A

  However, in the conventional stabilizer bushing manufacturing method, the position where wrinkles are generated on the outer peripheral surface of the liner differs depending on the formed stabilizer bush, and this wrinkle is removed when the liner is cut and the wrinkles are removed after the vulcanization process. Therefore, there is a problem that it is difficult to reduce the manufacturing time.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a stabilizer bush capable of easily and accurately specifying the position where wrinkles occur on the outer peripheral surface of a liner. .

In order to solve the above-described problems and achieve such an object, the stabilizer bushing manufacturing method of the present invention includes a cylindrical liner fitted with a support pin inserted in a cavity. A rubber-like elastic material is injected onto the outer peripheral surface along the center axis direction, and an insert molding process for injection-molding a rubber-like elastic portion on the outer peripheral surface of the liner, and the rubber-like elastic portion is vulcanized to give a rubber-like elasticity A vulcanization step of forming a stabilizer bush for supporting a stabilizer bar provided in a vehicle by a bearing hole having the liner fixed to an inner peripheral surface thereof, In the insert molding step, the carrier is protruded from the inside of the cavity to both the front side and the rear side in the injection direction of the rubber-like elastic material. Inserted into the tee, the portion of the liner that protrudes from the cavity to the front side in the injection direction is inserted into a ring-shaped retaining plate, the rubber-like elastic portion is injection-molded, and after the vulcanization step, The stabilizer bush is formed by cutting a portion of the liner between the portion inserted into the retaining plate and the cavity.
In this invention, the rubber-like elastic portion is injection molded by inserting the portion of the liner that protrudes from the cavity toward the front in the injection direction into the retaining plate, so that the wrinkles that flowed toward the front in the injection direction during the injection molding process. It is possible to suppress clogging with a damming plate and to prevent it from flowing to the front side in the injection direction from this, and it is possible to easily identify the location where wrinkles are generated, and to easily and accurately perform the cutting after the vulcanization process. It can be carried out.

Here, in the insert molding step, the rubber-like elastic portion may be injection-molded by fixing a portion of the liner that protrudes from the cavity to the rear side in the injection direction to the support pin.
In this case, at the time of the insert molding process, the rubber-like elastic portion is injection-molded in a state in which the portion of the liner that protrudes from the cavity to the rear side in the injection direction is fixed to the support pin. The portion in which the constituent fibers are caused to flow toward the front in the injection direction to cause wrinkles is limited to the portion in front of the injection direction relative to the injection hole located in the injection hole for injecting the rubber-like elastic material into the cavity. It is possible to prevent a portion located on the rear side in the injection direction from the injection hole portion from flowing toward the front side in the injection direction and generating wrinkles. Therefore, in the process in which the rubber-like elastic portion is injection-molded during the insert molding process, wrinkles generated in the portion located on the rear side in the injection direction from the injection hole portion of the liner are gradually flowed into the cavity, When the injection molding is completed, this wrinkle can be prevented from remaining in the cavity. On the other hand, even if wrinkles occur in the portion of the liner that is on the front side in the injection direction with respect to the injection hole portion, even if wrinkles occur in the process of injection molding of the rubber-like elastic portion, the wrinkles flow out to the outside without staying in the cavity. Since it is easy, it can suppress that the part fixed to the inner peripheral surface of the bearing hole among the outer peripheral surfaces of a liner has produced wrinkles.
From the above, it is possible to easily identify the location where wrinkles occur, and to surely exert the above-described effects such that the cutting after the vulcanization step can be performed easily and with high accuracy. Since the wrinkles are formed in the portion of the liner that is fixed to the inner peripheral surface of the bearing hole, it is possible to prevent the formed stabilizer bush from being deteriorated in durability and noise.

A plurality of the cavities may be provided at intervals along the central axis direction of the liner, and each cavity may be provided with an injection hole for injecting a rubber-like elastic material.
In this case, it is possible to realize high-efficiency production, and when the above-described damming plate is provided, it is ensured that wrinkles generated in one cavity flow into the other adjacent cavity on the front side in the injection direction. Can be prevented.

  According to this invention, the position where wrinkles occur on the outer peripheral surface of the liner can be specified easily and with high accuracy.

Hereinafter, an embodiment of a method for manufacturing a stabilizer bush according to the present invention will be described with reference to FIGS. 1 and 2.
First, an embodiment of a stabilizer bush 10 formed by the method for manufacturing a stabilizer bush according to the present invention will be described with reference to FIG. The stabilizer bush 10 is a rubber-like elastic body 12 having a bearing hole 20 having a liner 42 fixed to an inner peripheral surface thereof. The bearing hole 20 opens the stabilizer bush 10 to each of its both end faces 10a and 10a. It penetrates. In the illustrated example, a slit 22 extending from the inner peripheral surface of the bearing hole 20 to the side surface 10b of the stabilizer bush 10 is formed in the stabilizer bush 10 over the entire region in the central axis direction of the bearing hole 20. 50 can be arranged in the bearing hole 20 from the outside in the radial direction.

  The stabilizer bush 10 is sandwiched in the vertical direction by the bracket 14 and the vehicle body 52 side in a state where the stabilizer bar 50 provided in the suspension device of the vehicle is coaxially disposed in the bearing hole 20. Can be attached to. The liner 42 is made of a material having excellent wear resistance, a low coefficient of friction, and a heat resistance that does not completely melt in the vulcanization process described later, such as polytetrafluoroethylene fiber and polyamide. It is a woven fabric in which at least one of the fibers of the system is knitted. Further, the central axis of the cylindrical liner 42 and the central axis of the bearing hole 20 coincide with each other, and these central axes are hereinafter referred to as a central axis O.

Next, the manufacturing method of the stabilizer bush 10 comprised as mentioned above is demonstrated, referring FIG.
First, in a state where the cylindrical liner 42 fitted with the support pin 76 is inserted into the cavity 70 of the vulcanization mold 60, the rubber is formed on the outer peripheral surface of the liner 42 along the central axis O direction. A rubber-like elastic part 12a is injection-molded on the outer peripheral surface of the liner 42 (insert molding process). In this embodiment, a plurality of vulcanization molds 60 in which cavities 70 are formed are provided at intervals along the direction of the central axis O of the liner 42, and each cavity 70 has its own An injection hole 72 for injecting a rubber-like elastic material is provided inside. The inserted liner 42 is coaxially inserted into the injection hole 72. Note that the inner diameter of the liner 42 before the support pin 76 is fitted is slightly smaller than the outer diameter of the support pin 76. Further, an adhesive made of a thermosetting resin is applied to the outer peripheral surface of the liner 42 before the rubber-like elastic material is injected.

  Next, the stabilizer bush 10 is formed by vulcanizing the injection-molded rubber-like elastic portion 12a in the cavity 70 to form the rubber-like elastic body 12 (vulcanization step). At this time, the outer peripheral surface of the liner 42 is fixed to the inner peripheral surface of the bearing hole 20 by the adhesive. Thereafter, a slit 22 is formed in the stabilizer bush 10.

  Here, in the present embodiment, in the insert molding step, the liner 42 is inserted into the cavity 70 in a state where the liner 42 protrudes from the inside of the cavity 70 to both the front side A and the rear side B of the rubber-like elastic material. At this time, similarly to the liner 42, the support pins 76 are projected from the cavity 70 to both the front side A and the rear side B in the injection direction. A portion of the liner 42 that protrudes from the cavity 70 to the rear side B in the injection direction is fixed to the support pin 76, and the rubber-like elastic portion 12a is injection-molded.

  That is, in this embodiment, each vulcanization mold 60 can be advanced and retracted in the radial direction with respect to the outer peripheral surface of the liner 42 on the rear side B in the injection direction from the position where the injection hole 72 is provided. A supported fixing means 61 is provided, and a portion of the outer peripheral surface of the liner 42 facing the fixing means 61 is sandwiched and fixed with the support pin 76 over the entire periphery, thereby fixing the outer periphery of the liner 42. It is possible to suppress the fibers constituting the portion located between the fixing means 61 and the injection hole 72 on the surface side from flowing toward the front side A in the injection direction due to the injection pressure.

Further, in the insert molding step, a portion of the liner 42 protruding from the cavity 70 to the front side A in the injection direction is inserted into the ring-shaped retaining plate 62 to injection-mold the rubber-like elastic portion 12a. In the present embodiment, the damming plate 62 is connected to each vulcanization mold 60 via a cylindrical connecting pipe 63 that extends toward the front side A in the injection direction. These damming plates 62 and the connecting pipe 63 are arranged coaxially with the central axis O. The inner diameter of the ring-shaped retaining plate 62 is made smaller than the inner diameter of the connecting pipe 63.
Then, after passing through the vulcanization step, a portion of the liner 42 positioned between the dam plate 62 and the cavity 70 is cut, and the wrinkle 42b dammed to the dam plate 62 is removed to stabilize the stabilizer. A bush 10 is formed.

  As described above, according to the method for manufacturing the stabilizer bush according to the present embodiment, a portion of the liner 42 that protrudes from the cavity 70 to the front side A in the injection direction is inserted into the retaining plate 62 and the rubber-like elastic portion 12a is injection molded. Therefore, in this injection molding process, the wrinkle 42b flowing toward the front side A in the injection direction can be dammed by the dam plate 62, and it can be prevented from flowing to the front side A in the injection direction. The location can be easily identified, and the cutting after the vulcanization step can be performed easily and with high accuracy.

  In the present embodiment, the rubber-like elastic portion 12a is injection-molded in a state where the portion protruding from the cavity 70 to the rear side B in the injection direction in the liner 42 is fixed to the support pin 76 in the insert molding process. In the liner 42, the portion of the outer peripheral surface of the liner that is caused to flow toward the front side A in the injection direction causes wrinkles to be formed in a portion on the front side A in the injection direction with respect to the injection hole portion 42 a located in the injection hole 72. It is limited, and it is possible to prevent the portion located on the rear side B in the injection direction from the injection hole portion 42a from flowing toward the front side A in the injection direction and generating wrinkles.

Accordingly, in the process in which the rubber-like elastic portion 12a is injection-molded during the insert molding process, wrinkles generated in the portion of the liner 42 located on the rear side B in the injection direction from the injection hole portion 42a are gradually directed into the cavity 70. This wrinkle can be prevented from remaining in the cavity 70 when the injection molding is completed. On the other hand, in the portion of the liner 42 on the front side A in the injection direction with respect to the injection hole portion 42a, even if wrinkles are generated in the process of injection molding of the rubber-like elastic portion 12a, the wrinkles are not retained in the cavity 70 but are external to the outside. Therefore, wrinkles can be suppressed from occurring in the portion of the outer peripheral surface of the liner 42 fixed to the inner peripheral surface of the bearing hole 20.
As described above, it is possible to easily identify the location where the wrinkle 42b is generated, and to reliably achieve the above-described effects such that the cutting after the vulcanization process can be performed easily and with high accuracy. At the same time, wrinkles are formed in the portion of the liner 42 that is fixed to the inner peripheral surface of the bearing hole 20, thereby reducing the durability of the formed stabilizer bush 10 and preventing noise from being generated. it can.

  Further, in this embodiment, a plurality of cavities 70 are provided at intervals along the direction of the central axis O of the liner 42, and each cavity 70 is provided with an injection hole 72. Production can be realized. In particular, in the present embodiment, the damming plate 62 is provided, so that wrinkles generated in one cavity 70 are generated in the other cavity 70 adjacent on the front side A in the injection direction. It is possible to reliably prevent the rubber-like elastic portion 12a that has been injection-molded from flowing.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the liner 42 has been coated with an adhesive on the outer peripheral surface thereof, but a liner to which this adhesive is not coated may be employed. That is, for example, depending on the material of the fiber constituting the liner 42, the stitch density, etc., even if this adhesive is not applied, a part of the fiber is melted by heat during the insert molding process or the vulcanization process. The liner 42 can be fixed to the inner peripheral surface of the bearing hole 20 by welding to the inner peripheral surface of the bearing hole 20.
Polytetrafluoroethylene fibers and polyamide fibers are shown as the fibers constituting the liner 42. However, the fibers have excellent wear resistance, a low friction coefficient, and are completely melted in the vulcanization process. However, the material is not limited to these materials as long as the material has heat resistance to such an extent that it does not.

Further, in the above embodiment, the fixing means 61 is provided in the vulcanization mold 60, and when the rubber-like elastic portion 12a is injection-molded, a portion protruding from the cavity 70 to the rear side B in the injection direction is supported in the liner 42. Although fixed to the pin 76, injection molding may be performed without fixing in this way.
In the embodiment, the plurality of cavities 70 are provided at intervals along the direction of the central axis O of the liner 42. However, the number of the cavities 70 is not particularly limited, and is, for example, one. Also good.

  The position where wrinkles occur on the outer peripheral surface of the liner can be specified easily and with high accuracy.

It is a partial longitudinal cross-sectional view which shows an insert molding process and a vulcanization | cure process in the manufacturing method of the stabilizer bush shown as one Embodiment which concerns on this invention. (A) Front view and (B) AA line arrow when the stabilizer bush formed by the manufacturing method of the stabilizer bush shown in FIG. 1 is attached to the vehicle body in a state where the stabilizer bar is disposed in the bearing hole. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Stabilizer bush 12 Rubber-like elastic body 12a Rubber-like elastic part 20 Bearing hole 42 Liner 50 Stabilizer bar 52 Car body 62 Damping plate 70 Cavity 72 Injection hole 76 Support pin A Injection direction front side B Injection direction rear side O Center axis

Claims (3)

With a cylindrical liner fitted with a support pin inserted in the cavity, a rubber-like elastic material is injected on the outer peripheral surface of this liner along the central axis direction, and rubber-like elastic is applied to the outer peripheral surface of the liner. An insert molding process for injection molding the part;
By vulcanizing the rubber-like elastic portion to form a rubber-like elastic body, a vulcanization step of forming a stabilizer bush for supporting a stabilizer bar provided in a vehicle with a bearing hole in which the liner is fixed to an inner peripheral surface And a method of manufacturing a stabilizer bush having
In the insert molding step, the liner is inserted into the cavity in a state where the liner protrudes from the cavity to both the front side and the rear side in the injection direction of the rubber-like elastic material, and in the liner, from the cavity to the front side in the injection direction. The protruding portion is inserted into a ring-shaped stop plate, and the rubber-like elastic portion is injection-molded. After the vulcanization step, the liner is inserted between the portion inserted into the stop plate and the cavity. A method for manufacturing a stabilizer bush, comprising cutting a position portion to form a stabilizer bush. It is a manufacturing method of the stabilizer bush of Claim 1,
The method of manufacturing a stabilizer bush, wherein in the insert molding step, the rubber-like elastic portion is injection-molded by fixing a portion of the liner that protrudes from the cavity to the rear side in the injection direction to the support pin. It is a manufacturing method of the stabilizer bush of Claim 1 or 2,
A plurality of the cavities are provided at intervals along the central axis direction of the liner, and each cavity is provided with an injection hole for injecting a rubber-like elastic material therein. The manufacturing method of the stabilizer bush.

Images