JP3187003B2 - Toothed belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a toothed belt, and more particularly to a measure against noise and scattering of rubber powder.

[0002]

2. Description of the Related Art In general, since a load from a toothed pulley is applied to a tooth rubber portion of a toothed belt, the tooth rubber portion is made of an elastic elastomer material, and its surface is covered with an elastic tooth cloth. ing. In addition, since the above-mentioned tooth rubber portion is repeatedly deformed during driving of the belt, it is necessary to strengthen the adhesiveness with the tooth cloth, and therefore, the tooth cloth is resorcinol-formalin-rubber latex (RFL) liquid. After being immersed and subjected to an adhesive treatment, a so-called rubberization for covering the rubber by a soaking or spreading treatment is generally performed.

However, in the case of a toothed belt using a tooth cloth which has been rubberized after the above-described bonding treatment, the rubber driving rubber covers the surface of the tooth rubber portion and is exposed to the outside. Occasionally, the friction coefficient between the toothed pulley and the toothed pulley increases, causing noise due to friction when the toothed belt and the toothed pulley engage, or the rubber powder of the rubber covering the tooth cloth generated by the friction is scattered. There is a problem, and it is unsuitable for use in a place where the noise and the scattering of the rubber powder are disliked. For example, OA (office autom
ation) It is difficult to use for toothed belts for equipment and other general industries.

Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. Hei 7-190150, a tooth cloth covering a tooth rubber
The use of a tooth cloth which is only subjected to an adhesive treatment with an FL liquid and is not subjected to subsequent rubberization generates noise due to the contact of the rubber coating rubber for the tooth cloth with the toothed pulley and the rubber powder of the rubber coating. There has been proposed a toothed belt which prevents scattering of the belt.

Further, in this toothed belt, in order to prevent the rubber of the tooth rubber portion from being exposed to the outside through the gap surrounded by the yarns constituting the tooth cloth, the solid content of the RFL liquid for bonding the tooth cloth is adhered. The amount is set at 30-50% by weight. Also, when the belt is driven, the solid content of the RFL liquid adhering to the surface of the tooth cloth is brought into contact with the toothed pulley, whereby the friction coefficient between the toothed pulley and the toothed pulley is reduced, thereby preventing the generation of noise.

[0006]

However, in the toothed belt of the above proposed example, since the tooth cloth is only subjected to the bonding treatment with the RFL liquid, if the tooth cloth is used for a long period of time, the tooth cloth will be formed. In some cases, the gap surrounded by the thread is enlarged, and the rubber of the tooth rubber portion may be exposed to the outside from the gap, making it impossible to reliably prevent noise and generation of rubber powder.

In general, the rubber of the tooth rubber portion has a black color because carbon black is blended in consideration of physical properties such as strength, and the black rubber is a gap surrounded by a thread constituting the tooth cloth. If exposed from the outside, the appearance will be dirty and the image will be down.

SUMMARY OF THE INVENTION The present invention has been made in view of the foregoing, and an object of the invention is to prevent the generation of noise and the scattering of rubber powder due to the contact of the rubber inside the tooth cloth with the toothed pulley, Moreover, it is to prevent the image from being down due to the exposure of the black rubber.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a total denier per inch of a yarn extending in a width direction of a tooth cloth, a breaking elongation extending in a longitudinal direction of the tooth cloth belt, and a tooth. The woven structure of the cloth is specified.

More specifically, the present invention relates to a belt body comprising a back rubber portion in which a cord is embedded and a plurality of tooth rubber portions disposed at a predetermined pitch in the longitudinal direction of the belt on the back rubber portion. The following solution was taken for a toothed belt having a tooth cloth covered on the tooth rubber portion side of the belt body.

That is, according to the first aspect of the present invention, the total denier per inch of the yarn extending in the belt width direction of the tooth cloth is set to 8000 to 13000 denier. Further, the breaking elongation of the tooth cloth in the belt longitudinal direction is 11
Set to 0-170%. Further, the weave structure of the above-mentioned tooth cloth is twill weave. Further, the above-mentioned tooth cloth is immersed in a resorcinol-formalin liquid or a resorcinol-formalin-rubber latex liquid and subjected to an adhesive treatment.

According to the first aspect of the present invention, the total denier per inch of the tooth cloth extending in the belt width direction is 8,000 to 13,000 denier, and the density of the yarn extending in the belt width direction is increased. Therefore, the gap surrounded by the thread of the tooth cloth is reduced, and the black rubber of the tooth rubber portion is not exposed to the outside through the gap of the thread of the tooth cloth.

Since the elongation at break of the tooth cloth in the longitudinal direction of the belt is as large as 110 to 170%, the pressure on the tooth cloth when the tooth rubber part is formed by the pressure acting on the rubber during the production of the belt. The resistance is reduced and the flowing rubber is not exposed to the outside through the gap between the yarns of the tooth cloth.

Further, since the woven structure of the above-mentioned tooth cloth is a twill weave, that is, due to the woven structure, that is, the twill weave is formed by combining three or more warps and wefts in a diagonal direction. This is a so-called oblique line), and the fabric surface is softer and softer than the plain weave in which the warp and the weft are tightly interlaced one by one. The pressure resistance of the rubber against the tooth cloth at the time is reduced, and the flowing rubber is not exposed to the outside through the gap between the threads of the tooth cloth.

Therefore, when the belt is driven, only the solid portion of the RF liquid or the RFL liquid adhering to the tooth cloth comes into contact with the toothed pulley, and the black rubber of the tooth rubber portion does not contact the toothed pulley. Is not scattered as rubber powder. Further, the coefficient of friction between the toothed belt and the toothed pulley is reduced, so that noise is reduced. Therefore, O such as a printer
It is suitably used as a toothed belt for A equipment and other general industries.

According to a second aspect of the present invention, in the first aspect, a high-viscosity rubber layer having a higher viscosity than the tooth rubber portion is provided between the tooth rubber portion and the tooth cloth of the belt body. Are interposed so as not to be exposed to the outside from a gap surrounded by the yarn constituting the above.

According to the second aspect of the present invention, the black rubber in the tooth rubber portion remains in the high-viscosity rubber layer even if the gap surrounded by the yarns constituting the tooth cloth is widened due to long-term use. And the rubber of the high-viscosity rubber layer is not exposed to the outside through the gap between the teeth of the cloth, so that the operation and effect of claim 1 can be reliably obtained. Can be

According to a third aspect of the present invention, in the second aspect, the high-viscosity rubber layer is a white rubber layer or a light-color rubber layer.

According to the above construction, even if the rubber of the high-viscosity rubber layer is exposed to the outside through the gap between the yarns of the tooth cloth, the color of the high-viscosity rubber layer is conspicuous in white or light color. And does not impair the appearance.

[0020]

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

FIGS. 1 and 2 show a toothed belt 1 according to an embodiment of the present invention. The toothed belt 1 includes a belt main body 4 including a back rubber part 2 and a tooth rubber part 3,
A core wire 5 is embedded in the back rubber portion 2 in a spiral shape. The core wire 5 is made of, for example, polyester fiber, aliphatic polyamide fiber, aromatic polyamide fiber, rayon,
It is made of a low-tensile, high-strength rope tensile member selected from glass fiber, steel wire, and the like.

The tooth rubber portion 3 has a predetermined pitch, for example, 1.0 to 3.
Plural pieces are arranged at a pitch of 2 mm, and are integrally formed with the back rubber portion 2 using the same rubber as a raw material. The back rubber portion 2 and the tooth rubber portion 3, that is, the belt body 4
Examples of the rubber constituting are: natural rubber (NR),
Styrene butadiene rubber (SBR), chloroprene rubber (CR), nitrile rubber (NBR), butyl rubber (II
R) and the like, or a rubber or polyurethane rubber (U) obtained by appropriately blending these materials. Normally, the rubber constituting the belt body 4 is mixed with carbon black in order to secure physical properties such as strength, and the belt body 4 has a black color.

A tooth cloth 6 is integrally attached to the tooth rubber portion 3 side of the belt main body 4. The tooth cloth 6 is made of a woven cloth, and a typical example thereof is a woven cloth having elasticity woven with crimped nylon wefts and ordinary nylon warp yarns, or aromatic polyamide fibers. Examples include, but are not limited to, a woven fabric woven with a weft covered with a urethane elastic body to have elasticity and a warp such as nylon or aramid fiber.

As a feature of the present invention, the total denier per inch of the warp 6a extending in the belt width direction of the tooth cloth 6 is set to 8000 to 13000 denier (de). The reason for setting to such a value is to increase the density of the warp 6a extending in the belt width direction and to
This is to reduce the gap (texture 6c) surrounded by the weft yarn 6b and the weft yarn 6b so that the black rubber of the tooth rubber portion 3 is not exposed to the outside from the texture 6c of the tooth cloth 6.

The breaking elongation of the tooth cloth 6 in the longitudinal direction of the belt is set to 110 to 170%. The reason for setting to such a value is that when the tooth rubber portion 3 is formed by the pressure acting on the rubber during the production of the belt, the pressure resistance against the tooth cloth 6 is reduced, and the flowing rubber has the texture 6c of the tooth cloth 6. This is to prevent exposure from outside.

The tooth cloth 6 has a twill weave. The reason for employing the twill weave is that the warp 6a and the weft 6b are combined with each other in three or more to form a ridge (so-called oblique line) in an oblique direction. This is because the yarn is not restrained compared to the plain weave which is closely interlaced with each book, and the fabric is soft and fluffy as a whole, thereby reducing the pressure resistance of the rubber against the tooth cloth 6 at the time of manufacturing the belt. This is because it is possible to prevent the flowing rubber from being exposed to the outside from the texture 6c of the tooth cloth 6.

The above-mentioned tooth cloth 6 is immersed in a resorcin-formalin (RF) solution and subjected to an adhesive treatment, and a solid content of the RF solution adheres to the surface of the tooth cloth 6 through a drying process. Note that a resorcin-formalin-rubber latex (RFL) solution may be used instead of the RF solution.

Further, between the tooth rubber portion 3 of the belt main body 4 and the tooth cloth 6, a white rubber layer 7 is provided with a texture 6c of the tooth cloth 6.
It is interposed so as not to be exposed from the outside. For example, the white rubber is coated on one side of the tooth cloth 6 after soaking or without soaking the white rubber, and a white rubber layer 7 is formed by a drying process. At this time, the viscosity of the white rubber is adjusted to be higher than that of the tooth rubber portion 3 so as to prevent the white rubber from seeping out on the surface of the tooth cloth 6 opposite to the coating surface. And when forming the belt,
The coating surface of the tooth cloth 6 is brought into contact with the molding side of the tooth rubber portion 3 of the unvulcanized rubber sheet, and press-molding is performed by a generally performed press-molding method.

The rubber constituting the white rubber layer 7 may be the same rubber as the rubber constituting the belt body 4.
What is necessary is just to mix hydrated silica, titanium oxide, etc. instead of carbon black. Note that a light-colored rubber layer may be employed in place of the white-colored rubber layer 7. In other words, any color may be used as long as the rubber seeps out on the surface opposite to the coating surface of the tooth cloth 6. .

Next, examples of the present invention will be specifically described together with comparative examples.

Table 1 shows the rubber composition constituting the belt body 4 of the toothed belt 1. Examples 1 and 2 and Comparative Examples 1 to 3 each constituted the belt body 4 with this rubber composition.

[0032]

[Table 1]

Table 2 shows the rubber composition for treating the tooth cloth 6, that is, the rubber composition for forming the white rubber layer 7.
In each of Comparative Examples 1 to 3, the white rubber layer 7 was used.

[0034]

[Table 2]

Table 3 shows the formulation of the RF solution for bonding the tooth cloth 6, and Examples 1 and 2 and Comparative Examples 1 to 3 show this RF solution.
The solution was bonded.

[0036]

[Table 3]

The tooth cloths 6 used in Examples 1 and 2 and Comparative Examples 1 to 3 were coated on one side only with the compounded rubber shown in Table 2 on the adhesive treated with the RF solution, and the white rubber was used as the tooth cloth. This does not seep onto the surface of the cloth 6 opposite to the coating surface.

That is, in Examples 1 and 2 and Comparative Examples 1 to 3, the structure of the tooth cloth 6 (total denier per inch of the warp yarn 6a extending in the belt width direction, breaking elongation in the belt longitudinal direction, and weaving structure) are different. Other conditions are the same.

The evaluation of "splashing of rubber powder" was performed on the toothed belts 1 of Examples 1 and 2 and Comparative Examples 1 to 3 in the following manner. The results are shown in Table 3 together with the "exitability" and "meshing".

<Procedure of Experiment> The toothed belt 1 is wound around a driving pulley and a driven pulley, and is run for 1 hour at a rotation speed of 1000 rpm with tension applied thereto. The scattering of the powder was visually inspected.

[0041]

[Table 4]

As is clear from Table 4, in Examples 1 and 2, good results were obtained in all the evaluation items.

However, in Comparative Example 1, the total denier per inch of the warp yarn 6a extending in the belt width direction of the tooth cloth 6 was 7,800 denier, which was less than the lower limit (8000 denier) of the numerical value characteristic of the present invention. Since the density of the warp 6a extending in the width direction is low and the gap (texture 6c) surrounded by the warp 6a and the weft 6b of the tooth cloth 6 is large, the black rubber of the tooth rubber portion 3 is Was exposed to the outside.

In Comparative Example 2, "rubber exposed from tooth cloth"
Although there was no problem with "splashing of rubber powder" and "tooth protruding property", the total denier per inch of the warp yarn 6a extending in the belt width direction of the tooth cloth 6 was 13100 denier, and the upper limit of the numerical value characteristic of the present invention. (13000 denier)
, The density of the warp yarns 6a extending in the belt width direction became too high, the thickness increased, and the meshing became poor. In this case, in particular, in the case of a small-pitch belt in which the interval between the tooth rubber portions is narrow, the running life of the belt is reduced due to poor meshing.

In Comparative Example 3, since the weaving structure of the tooth cloth 6 is a plain weave, the warp and the weft are closely interlaced one by one to form a flat cloth surface with many constraint points. It doesn't have a fluffy feel like "exposed rubber from the tooth cloth"
And "splashing of rubber powder". This is because the pressure resistance of the rubber against the tooth cloth 6 increases during belt production, and the rubber is exposed to the outside from the texture 6c of the tooth cloth 6, and this is scattered as rubber powder due to friction.

The elongation at break of the tooth cloth 6 in the longitudinal direction of the belt is within the numerical range characteristic of the present invention for both Examples 1 and 2 and Comparative Examples 1 to 3, and is not within this range. However, in this case, when the tooth rubber portion 3 is formed by the pressure acting on the rubber at the time of manufacturing the belt, the pressure resistance against the tooth cloth 6 increases, and the flowing rubber becomes the texture 6c of the tooth cloth 6. From the outside.

During the compounding of the rubber for treating the tooth cloth 6, if the amount of hydrated silica or titanium oxide is excessive and the viscosity becomes too high, or if the thickness of the rubber becomes too large, the tooth during the molding of the belt is too thick. Since it is difficult for the shape of the rubber portion 3 to become regular and the toothing property may be deteriorated, it is necessary to take this point into consideration when forming the belt.

[0048]

As described above, according to the present invention, the total denier per inch of the thread extending in the belt width direction of the tooth cloth bonded with the RF liquid or the RFL liquid is 8%.
Since the breaking elongation in the longitudinal direction of the belt is set to 110 to 170% and the weaving structure is twilled, the coefficient of friction is lower than that of rubberized rubber exposed on the surface of the tooth cloth. In addition, the present invention provides a belt which is extremely suitable as a toothed belt for OA equipment, such as printers, which dislikes them, and which does not dissipate the rubber powder in the tooth rubber portion, and which is used for other general industries, in which noise at the time of meshing with a toothed pulley is significantly reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of a toothed belt.

FIG. 2 is a perspective view of a toothed belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Toothed belt 2 Back rubber part 3 Tooth rubber part 4 Belt body 5 Core wire 6 Teeth cloth 6a Warp (yarn forming tooth cloth) 6b Weft (yarn forming tooth cloth) 6c Surrounded by yarn forming tooth cloth Gap (texture) 7 White rubber layer (high viscosity rubber layer)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) F16G 1/00 F16G 1/08 F16G 1/28 F16G 5/00 F16G 5/06

Claims (3)

(57) [Claims] 1. A belt body comprising a back rubber portion in which a core wire is embedded, and a plurality of tooth rubber portions disposed on the back rubber portion at a predetermined pitch in the longitudinal direction of the belt. A toothed belt having a tooth cloth adhered to a tooth rubber part side, wherein the tooth cloth has a total denier per inch of a thread extending in a belt width direction of 8000 to 13000 denier,
The elongation at break in the belt longitudinal direction is set to 110 to 170%, and the weave structure is a twill weave, which is immersed in a resorcinol-formalin liquid or a resorcinol-formalin-rubber latex liquid and subjected to an adhesive treatment. Toothed belt. 2. The toothed belt according to claim 1, wherein a high-viscosity rubber layer having a higher viscosity than the tooth rubber part constitutes the tooth cloth between the tooth rubber part side of the belt main body and the tooth cloth. A toothed belt that is interposed so as not to be exposed to the outside from a gap surrounded by a belt. 3. The toothed belt according to claim 2, wherein the high-viscosity rubber layer is a white rubber layer or a light-color rubber layer.