JPH0353095B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a stabilizer bushing used for attaching a suspension stabilizer to a vehicle body or suspension in a vehicle such as an automobile.

[Conventional technology]

Traditionally, automobiles have been equipped with stabilizers to improve ride comfort and stability of the vehicle body by improving the tilt of the vehicle body caused by centrifugal force when turning and the imbalance in ground contact pressure between the left and right wheels. , a button is provided on this stabilizer. As shown in FIG. 7, for example, the stabilizer is assembled by attaching an end of a stabilizer bar 3 to a suspension arm 2 that supports a front wheel 1 of an automobile. Reference numeral 4 denotes a mounting device that houses a stabilizer bush, and is adapted to rotatably mount the center portion of the stabilizer bar 3, which constitutes the torsion portion, to the vehicle body. That is, the mounting tool 4 is a stabilizer bushing having a substantially semi-cylindrical shape, as shown in FIG. The stabilizer bar 3 is fitted into the slit 6 with a large opening, and in this state, as shown in FIG. The tightening portion 7a on the outer circumferential surface thereof is fixed to the vehicle body 8 by using a clamp 9 and a tightening tool 10 such as a bolt or a nut. In FIG. 8, reference numeral 11 denotes protrusions for clamp positioning and fixing that are integrally formed on both left and right edges of the outer peripheral surface of the stabilizer bush 7.

The above-described stabilizer bush 7 is generally made by using a mold, injecting a molding material such as rubber or thermoplastic elastomer into the molding space and curing it, and then removing it from the mold to form a semicircular shape with an inner hole. It is manufactured by creating a columnar bushing body, and then cutting into the inner hole from the flat bottom surface of the bushing body.

[Problem that the invention attempts to solve]

However, when manufacturing the stabilizer bush 7 as described above, it is necessary to form the cuts each time after molding the bush main body, which makes the work extremely complicated and reduces manufacturing efficiency. Ta. In addition, since the resulting stabilizer bush itself has a large coefficient of friction on the inner circumferential surface of the inner hole 5, it has poor responsiveness to pitching of the vehicle body that occurs when driving on uneven roads or when suddenly starting or braking, resulting in poor ride comfort. Unfortunately, the stabilizer bar 3 due to the pitching phenomenon mentioned above
The problem has been that abnormal noises such as fricative noises and squeaks are generated due to the rotation.

In order to solve such problems with the stabilizer bush itself, a stabilizer has a structure in which a resin cylindrical rigid member 13 with excellent self-lubricating properties is laminated on the inner peripheral surface of the inner hole 12, as shown in FIG. Bush 14 has been proposed.

However, like the stabilizer bush 7 described above, this stabilizer bush 14 is also manufactured by forming a cut in the bush body after molding, which results in poor manufacturing efficiency. However, due to stress concentration due to "prying" caused by tilting of the vehicle body due to centrifugal force when the vehicle turns, there is a problem that the cut portion curls up and the service life is shortened. Further, as mentioned above, there is also the problem of generation of abnormal noise.

This invention was made in view of these circumstances, and it is possible to improve the running stability and ride comfort of a vehicle without generating abnormal noise, and to efficiently create a stabilizer bushing that has a long service life. The purpose is to provide a manufacturing method.

[Means for solving problems]

In order to achieve the above object, the method for manufacturing a stabilizer bush of the present invention involves preparing a mold having a semi-cylindrical forming space and a pin that crosses this space in the axial direction, and having a width in the axial direction of the forming space. A step of preparing a belt-shaped lubricating cloth material having substantially the same length as the length of the belt-shaped lubricating cloth material, and aligning an appropriate portion in the longitudinal direction of the belt-shaped lubricating cloth material along the outer periphery of the pin, with one end side and the other end side of the cloth material facing each other. and a step of injecting a molding material into the molding space of the mold.

According to this method, the molding material is injected into the outer periphery of the belt-shaped lubricating cloth material, which is exposed outside the molding space with one end and the other end facing each other along the outer periphery of the pin, and the molding material is injected into the outer periphery of the cloth material. Since the elastic portion of the stabilizer bushing is formed, the trace of the pin being pulled out becomes the inner hole of the stabilizer bushing, and the seam between one end and the other end of the cloth material is automatically cut. Therefore, after molding, the desired stabilizer bushing can be manufactured extremely efficiently without any cutting work. Furthermore, the resulting stabilizer bushing is not made of a rigid resin member like the conventional example, but has a softer surface-lubricating lining cloth material lined on the inner circumferential surface of the inner hole of the bushing, which reduces noise. This does not occur, and the lining material flexibly follows the deformation of the elastic material that makes up the bush.
It has excellent responsiveness to vehicle pitching, etc., and improves running stability and ride comfort. Furthermore, in the stabilizer bushing, the end of the lining fabric extends to the surface of the cutout and is integrated there, so it effectively prevents the lining fabric from peeling off even in the event of "prying" or the like. The effect of improving the service life can be obtained.

〔Example〕

Next, the present invention will be explained in detail based on examples.

That is, as shown in FIGS. 1 and 2,
As a two-cavity mold, two cylindrical pins 19 are made by an upper mold 20, a lower mold 21, and a middle mold 22.
A mold 24 is provided in each set of semi-cylindrical molding spaces 23, and is detachably disposed so as to traverse the space 23 in the axial direction. In FIGS. 1 and 2, 25 is an injection port, and 26 is a runner. Next, a set of the two pins 19 is taken out, and as shown in FIG.
7 is wound around the pin 19 in the vicinity of both ends with the other end positioned in the middle of the pair of pins.
The band-shaped fluorocarbon resin cloth material 27 is made of 75% 400 denier fluorocarbon resin (hereinafter abbreviated as "PTFE") fiber,
It is made of PTFE knitted cloth made of 25% 150 denier polyester fiber (knitting conditions: well 17, course 20, basis weight 400g/m ² ). It is rich in polyester fibers to improve adhesion with the elastic material that makes up the material. Next, in this state, insert the pin 19 with the cloth material 27 into the fourth
As shown in the figure, an elastic material such as unvulcanized rubber is placed between the upper mold 20 and the lower mold 21, and the injection port 2
5. Inject into the molding space 23 via the runner 26 and vulcanize and harden. Next, open the mold 24 and take out a set of two bushing bodies as shown in FIG. By cutting at the position of
Two desired stabilizer bushes 28 (see FIG. 6) can be obtained at the same time.

The stabilizer bushing 28 thus obtained is constructed by injecting and hardening an elastic material into the outer periphery of the cloth material 27, so that the inner hole 29 where the pin was removed is lined with the cloth material 27. A slit is formed by one end and the other end of the cloth material extending outward from the inner hole 29. That is, although the elastic material penetrates into the cloth material 27 to some extent, it does not penetrate up to the seam between one end and the other end of the cloth material 27, so the seam between one end and the other end of the cloth material 27 is not bonded and cut. The stabilizer bar remains in the shape and can be expanded freely, so that it can be expanded and the stabilizer bar can be easily fitted. In addition, this stabilizer button 28 is
As mentioned above, since the inner hole 29 is made of the fluororesin cloth material 27 with rich surface lubricity, when installed in a vehicle such as an automobile, the stabilizer bar fits into the bush as the vehicle runs. Even if it rotates,
Abnormal noises such as fricative sounds and squeaks are not generated. Furthermore, the lining material 27 flexibly follows the deformation of the elastic material constituting the bushing, and is also integrated with the bushing body, and the end portion has a cutout portion 30 that is not subjected to the force due to rotation of the stabilizer bar. Since it extends to the surface and is integrated there, it will not peel off even when the stabilizer bar is "pried", etc., and therefore the useful life of the stabilizer bushing can be improved. .

In addition, in the above example, when molding, if a release sheet is inserted into the seam of the ends of the cloth material that forms the cut section, the elastic material will reach the seam of the ends of the cloth material. Even if it penetrates, adhesion at the seam is prevented and the cut portion 30 can be reliably obtained. In this way, when using a release sheet, it is not necessarily necessary to extend the end of the cloth material to the tip of the slit, and it may be stopped midway. Further, in the above embodiment, a two-cavity mold is used to produce two bushes at the same time, but it is also possible to produce one bushing or a large number of bushings, such as three or more.

In addition, in the above example, as the lining cloth material,
75% PTFE fiber and 25% polyester fiber PTFE
Knitted cloth that uses knitted cloth, but is composed of PTFE fibers as the main component and natural or synthetic fibers other than PTFE fibers as other components,
Alternatively, any woven fabric such as a mixed woven fabric can be suitably used. Among these, in order to obtain particularly excellent sliding performance,
It is preferable to use a structure in which the surface proportion and arrangement distribution are uniform so that the surface that becomes the sliding surface is mainly occupied by PTFE fibers, for example, at a ratio of 60 to 85%. However, the above-mentioned lining cloth material is not limited to these materials, and any material having high lubricity can be used.

〔Effect of the invention〕

Since the stabilizer bushing of the present invention is manufactured in the manner described above, there is no need to make cuts each time after manufacturing the bushing body as in the conventional method, and it is possible to realize a significant improvement in manufacturing efficiency. In addition, the resulting stabilizer bushing has an inner hole lined with a lubricating fabric material, and the end of the lubricating fabric material extends to the cutout and is integrated there, which prevents noise from occurring. In addition to improving driving stability and ride comfort, it is resistant to "prying" caused by the stabilizer bar and provides stable performance over a long period of time.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a mold used in an embodiment of the present invention, FIG. 2 is a view looking down after removing the upper mold from the state shown in FIG. 1, and FIGS. Fig. 6 is a cross-sectional view of the stabilizer bush obtained thereby, and Fig. 7 is an explanatory drawing schematically explaining the mounting state of the stabilizer bar. ,
FIG. 8 is a perspective view of the stabilizer bush, FIG. 9 is an explanatory cross-sectional view taken from FIG. 7, and FIG. 10 is a cross-sectional view of another conventional stabilizer bush. 19...Cylindrical pin, 20...Upper mold, 21...
... lower mold, 22 ... middle mold, 23 ... molding space, 2
4... Mold, 25... Inlet, 26... Runner,
27... Fluorine resin cloth material.

Claims (1)

[Claims] 1. A mold having a semi-cylindrical molding space and a pin that crosses this space in the axial direction is prepared, and
preparing a belt-shaped lubricant fabric whose width is approximately the same as the length in the axial direction of the molding space, and aligning an appropriate portion of the belt-shaped lubricant fabric in the longitudinal direction along the outer periphery of the pin, one end of the fabric; a step of positioning one side and the other end side facing each other outside the molding space of the mold;
A method for producing a stabilizer bushing comprising the step of injecting a molding material into the molding space of the mold. 2. The method for manufacturing a stabilizer bushing according to claim 1, wherein the belt-shaped lubricating cloth material is a fluororesin-based cloth material whose main component is fluororesin fiber.