JP2003161345A - Toothed belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothed belt capable of preventing the scattering of rubber dust caused by the texture opening of a tooth cloth's weave texture. <P>SOLUTION: A plurality of tooth parts 3 are provided to a belt body 2 embedded with a core wire 1 along the longitudinal direction, and the toothed belt is formed by covering the surfaces of the tooth parts 3 and tooth bottom parts 4 with the tooth cloth 5. As the tooth cloth 5, a sailcloth which is made of warps twisted independently one by one, whose cloth cover factor is 0.90-0.92 and which is treated with only a resorcinol-formalin-latex solution, is employed. The sailcloth forming the tooth cloth 5 has the small texture opening of the weave texture, and moreover, the texture opening of the weave texture is hard to grow larger despite the wear and tear of the tooth cloth 5 after using the toothed belt for a long period of time. Also, the tooth cloth along the longitudinal direction of the toothed belt is extended more easily, so that a tooth profile shape can be profiled with excellent accuracy. Furthermore, since the tooth cloth 5 is made into a texture of one third disordered twill weave, the rubber bleeding of the surfaces of the tooth parts 3 is suppressed more than ever and abrasion resistance is improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber toothed belt having a transmission surface coated with a fiber material, and more particularly to a small toothed belt having a transmission surface formed only of a fiber material. .

[0002]

2. Description of the Related Art A toothed belt is manufactured by providing a belt main body having a core wire embedded therein with a large number of teeth along the longitudinal direction, and coating the tooth surface and the tooth bottom with a tooth cloth.
The belt body is generally made of rubber such as chloroprene rubber and hydrogenated nitrile rubber.
A canvas woven by using crimped 6 nylon or 66 nylon on the weft along the longitudinal direction of the belt body and non-crimped 6 nylon or 66 nylon of the same composition on the widthwise warp of the belt body. Is used.

Then, in order to firmly adhere to the tooth portion, the canvas is resorcin-formalin-latex liquid (RFL).
It is common to use a tooth cloth formed by rubberizing after applying an adhesive treatment with (liquid) and further soaking or spreading treatment.
Since the coefficient of friction with the toothed pulley becomes high, there are problems that noise due to friction is generated and powder of the covering rubber of the tooth cloth is scattered.

Therefore, as can be seen in Japanese Patent Publication No. 5-33800, there is a toothed belt which is produced by using a tooth cloth in which at least the contact surface with the toothed pulley is not rubberized, by bonding the canvas with only the RFL liquid. , Provided by the applicant.

[0005]

[Problems to be Solved by the Invention]
Even if the toothed belt provided in Japanese Unexamined Patent Publication No. 33800 is used for a long period of time, the weft of the tooth cloth and the warp threads forming the tooth cloth will have a large mesh opening due to wear of the tooth cloth, and the belt will be formed from this open mesh. The rubber of the main body could be exposed. Especially for small toothed belts, it is necessary to reduce the rigidity of the tooth cloth in order to use it with a small pulley diameter. Moreover, in order to form the shape of the small tooth part, only thin tooth cloth can be used. However, the mesh opening of the tooth cloth was likely to be large.

When the opening of the weave is so large that the rubber of the belt main body is exposed in this way, the exposed rubber is abraded between the toothed pulley and the rubber and is scattered as rubber powder. . The present invention has been made in view of the above points, and an object of the present invention is to provide a toothed belt that can prevent the scattering of rubber powder due to the opening of the texture of the tooth cloth. It is a thing.

[0007]

According to the present invention, a plurality of tooth portions 3 are provided in a belt main body 2 in which a core wire 1 is embedded along a longitudinal direction, and a surface of the tooth portion 3 and a tooth bottom portion 4 are covered with a tooth cloth 5. In the toothed belt formed as described above, the cloth cover 5 has a cross cover factor of 0.90 to 0.92, the warp yarn density of the tooth cloth is higher than the weft yarn density, and the weave design is 1/3 so that the exposed amount of the twisted yarn extending in the belt width direction and the exposed amount of the twisted yarn extending in the belt longitudinal direction are different on both sides of the canvas.
The canvas surface, which is constructed in a random twill and has a large exposed amount of twisted yarns extending in the belt width direction, is located on the outside, and the canvas surface with a large exposed amount of twisted yarns extending in the belt longitudinal direction is positioned on the tooth rubber layer side. The toothed belt is characterized by using a canvas treated only with the resorcin-formalin-latex liquid.

A second aspect of the present invention is the toothed belt according to the first aspect, wherein when the warp threads of the canvas form a toothed belt belt, the tooth belt extends along the width direction of the toothed belt. The invention of claim 3 is characterized in that the tooth cloth 5 has a resorcin-formalin-latex liquid content of 30 to 50% by mass of solid content.

A fourth aspect of the present invention is the toothed belt according to any one of the first to third aspects, wherein the density of the warp threads of the tooth cloth is approximately three times the density of the weft threads.

According to the first to fourth aspects of the present invention, the density of the warp yarns of the tooth cloth is higher than that of the weft yarns, and the weaving texture is a twist yarn extending in the belt width direction and a twist yarn extending in the belt longitudinal direction. 1/3 random twill weave so that the exposed amount of the yarn differs on both sides of the canvas, and the exposed amount of the twisted yarn extending in the belt width direction is outside, and the exposed amount of the twisted yarn extending in the belt longitudinal direction is large. The toothed belt according to any one of claims 1 to 3, wherein the canvas surface is located on the tooth rubber layer side. Therefore, the warp yarn having a high density is largely exposed on the side in contact with the pulley, and the warp yarn is further exposed. Since the weft thread, which has a lower density than that of the tooth cloth, is exposed on the back side (tooth rubber layer side) of the tooth cloth, the adhesiveness with the tooth rubber layer and the impregnation with the treatment liquid are improved, and the abrasion resistance is improved and at the same time Composite features of cloth and tooth rubber layer Rubber drop and by meshing interference with pulleys is getting better, the peeling phenomenon between the tooth cloth and the tooth rubber layer is suppressed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 shows the structure of a toothed belt. A large number of tooth portions 3 are provided integrally on one surface of a belt body 2 in which a core wire 1 is embedded along the longitudinal direction of the belt body 2. It is formed by pasting a tooth cloth 5 on the tooth bottom portion 4 between the portions 3.

As the core wire 1, polyester, aliphatic polyamide, aromatic polyamide, rayon, glass fiber,
A steel wire having a low elongation and a high strength can be used. Belt main body 2 and tooth portion 3 in which the core wire 1 is embedded
Is formed as a rubber layer, and the rubber layer is NR
(Natural rubber), SBR (styrene-butadiene rubber),
CR (chloroprene rubber), NBR (nitrile rubber),
A rubber selected from IIR (butyl rubber) or the like can be used alone or in a blend, or a polyurethane rubber can be used in addition to these rubbers.

Further, the tooth cloth 5 may be a cloth cloth which is adhesively treated only with a resorcin-formalin-latex solution (RFL solution), and is not toothed with rubber such as soaking or spreading and is toothed. The contact surface with the pulley has the RFL adhesion surface exposed. The present invention is characterized in that, in the present invention, as the canvas for forming the tooth cloth 5, warp yarns which are independently twisted one by one are used, and the one having a cross cover factor of 0.90 to 0.92 is used.

Here, the cross-cover factor of the canvas is a coefficient indicating how small the voids between the yarns in the canvas, that is, the extent to which the canvas is covered with the yarns, and the value of the cross-cover factor is A larger value means less voids between the threads in the canvas. The cross cover factor is defined as being calculated by the following formula.

Cover factor K ₁ = d of warp (warp)
₁ × n ₁ = k ₁ × n ₁ × √D ₁ Weft (weft) cover factor K ₂ = d ₂ × n ₂ = k
₁ × n ₁ × √D ₁ cross cover factor K = K ₁ + K ₂ −K ₁ × K ₂ d ₁ : warp diameter (cm) n ₁ : warp thread density (threads / cm) k ₁ : 2: √ (900000 × π × ρ ₁ ) [ρ ₁ : specific gravity of warp] D ₁ : number of denier of warp d ₂ : diameter of weft (cm) n ₂ : yarn density of weft (pieces / cm) k ₂ : 2: / √ (900000 × π × ρ ₂ ) [ρ ₂ : specific gravity of weft] D ₂ : denier number of weft The cross-cover factor of the canvas forming the tooth cloth 5 is 0.
If it is less than 90, rubber may ooze out from the tooth cloth 5 when forming the toothed belt, and if the tooth cloth 5 is worn after the toothed belt is used for a long time, the texture of the tooth cloth 5 There is a risk that the rubber will be exposed due to the large opening of the. Further, the cross-cover factor of the canvas forming the tooth cloth 5 is 0.
If it exceeds 92, the rigidity of the tooth cloth 5 is increased and it becomes difficult to accurately adhere the tooth cloth 5 along the shape of the tooth portion 3. Furthermore, by using the warp yarns that are independently twisted one by one as the canvas of the tooth cloth, when the average yarn densities are the same, the space between the yarns is greater than when two yarns are aligned and twisted. There is no variation in the voids, and even the largest voids between the yarns are small, and when the fibers are twisted individually one by one, rubber bleeding on the toothed belt surface is reduced.

Further, when two pieces are aligned and twisted,
When the rubber flows toward the tooth side and pushes the canvas toward the tooth surface to form a tooth shape, the weft thread along the longitudinal direction of the belt extends in the cloth to form the tooth profile. At this time,
When two warp yarns along the belt width direction are aligned to form a canvas, the two warp yarns are aligned and therefore the two warp yarns aligned at the intersection of the warp yarn and the weft yarn are obstacles. The weft thread stretch is restricted. On the other hand, 1 warp
When the canvas is formed by twisting each book independently, even if the yarn density in the canvas is the same as in the case of the two-ply alignment,
The force that suppresses the elongation of the weft thread decreases at the portion intersecting with the weft thread, and the weft thread does not hinder the formation of the tooth profile and the tooth shape is likely to appear. Further, since the tooth cloth forms a tooth shape by the elongation in the belt longitudinal direction, it is effective to use one yarn independently twisted for each warp yarn along the belt width direction.

Further, in order to prevent the mesh size of the tooth cloth 5 from becoming large, it is preferable to use a cloth cloth having a high amount of the RFL liquid attached. If the amount of solid content resin of RFL is high, the surface of the tooth cloth 5 is covered with the resin, and the elongation of the tooth cloth 5 becomes small and the mesh opening becomes difficult to increase. In order to increase the solid content of the RFL solution, it is preferable to treat the canvas with the RFL solution twice. In the present invention, it is preferable that the solid content of the RFL liquid in the canvas forming the tooth cloth 5 is in the range of 30 to 50% by mass. When the solid content adhesion amount is less than 30% by mass, the effect of reducing the elongation of the tooth cloth 5 and making it difficult for the openings to become large becomes insufficient, and conversely, when the solid content adhesion amount exceeds 50% by mass, Since the rigidity of the tooth cloth 5 is increased, it becomes difficult to accurately attach the tooth cloth 5 along the shape of the tooth portion 3, and the tooth portion 3 is uneven in size. It may decrease. In this way, the warp yarns each having a cross cover factor of 0.90 to 0.92 independently twisted are used in a direction along the width direction of the toothed belt, and RFL
By using the tooth cloth 5 formed of canvas with a solid content adhesion amount of the liquid of 30 to 50% by mass, it is possible to prevent the scattering of rubber powder due to the opening of the mesh of the tooth cloth, and to further improve the tooth profile. Therefore, it is possible to manufacture a toothed belt with high accuracy.

Further, the density of the warp yarns of the tooth cloth is higher than that of the weft yarns, and the weaving structure is such that the exposed amount of the twisted yarn extending in the belt width direction and the exposed amount of the twisted yarn extending in the belt longitudinal direction are different on both sides of the canvas. Composed in 1/3 random twill,
Further, the canvas surface having a large exposed amount of twisted yarns extending in the belt width direction is positioned on the outer side, and the canvas surface having a large exposed amount of twisted yarns extending in the belt longitudinal direction is positioned on the tooth rubber layer side.

The weave design is as shown in FIG. That is, in FIG. 2, 6 nylon fiber yarns extending in the belt width direction are woven as warp yarns and 6 nylon fiber yarns extending in the belt longitudinal direction are weft yarns. In FIG. The yarns are exposed on the front side of the tooth cloth 5, and the weft threads (6 nylon fibers) are exposed on the back side of the tooth cloth 5. The exposed amount of warp yarns is larger than that of the weft yarns on the front surface side of the 1/3 random twill weave cloth 5, and conversely, the exposed amount of the weft yarns is larger than that of the warp yarns on the rear surface side. In this tooth cloth 5, the canvas surface with a large amount of exposed warp yarns is located on the outside and the canvas surface with a large amount of exposed weft yarns is located on the tooth rubber layer side, and the 2/2 twill tooth shown in FIG. Compared to the cloth, the warp yarn (6 nylon fiber) is more exposed on the front side of the tooth cloth 5, that is, the side in contact with the pulley, and is also exposed longer at a random pitch. Therefore, a large amount of weft yarn (6 nylon fiber yarn) is exposed on the back side of the tooth cloth, that is, on the side in contact with the tooth rubber layer 3,
Moreover, it is exposed at a random pitch for a long time.

In the tooth cloth 5, the density of the warp yarns is made higher than that of the weft yarns, more preferably about 3 times, so that many warp yarns are exposed on the side in contact with the pulley and further exposed. Since the warp has a high density, it has the effect of suppressing the exudation of rubber to the surface of the tooth cloth and, at the same time, having an effect on the abrasion resistance of the belt. On the other hand, on the side in contact with the tooth rubber layer 3,
Since the weft is exposed, the density of the weft is made smaller than that of the warp, which improves the adhesiveness with the tooth rubber layer and the impregnation with the treatment liquid, and suppresses the separation phenomenon between the tooth cloth and the tooth rubber layer. It

[0021]

EXAMPLES Next, the present invention will be specifically described with reference to examples. (Example) A warp yarn made of 66 nylon of 40 denier (warp yarn, the same hereinafter) and a weft yarn made of 66 nylon of 40 denier (weft yarn, the same below) were used, and the warp density was 340/3 cm and the weft density was 119/3 cm. Woven 1 /
A canvas of 3 random twill weave was used, and the canvas was vibrated in water to shrink it to about 1/2 of the width at the time of weaving (the composition of the canvas is shown in Table 1). Next, this canvas is RF
Dip in liquid L and pass between a pair of rolls, 0.5 kg / c
After squeezing with m (gauge pressure), it was dried at 150 ° C for 4 minutes, and the RFL-treated canvas was again mixed with R of the same composition.
Immerse in FL solution, squeeze under the same conditions, then dry under the same conditions,
A tooth cloth having a solid content of RFL of 40% by mass was obtained. The cross cover factor of this tooth cloth was 0.91.

As a core wire, about 600 glass fiber filaments having a diameter of about 9 μm are bundled to form a strand, and the strand is immersed in an RFL solution having the same composition as above and dried at 200 ° C. for 2 minutes. After doing 4.0 times / 1
A cord having a diameter of about 0.3 mm twisted with a twist number of 0 cm was used. Then, the above-mentioned tooth cloth is set in an endless tubular shape with the wefts in the circumferential direction so that the warp threads run along the width direction of the belt, and set in a mold, and the S-twisted and Z-twisted core wires are alternately set on the tooth cloth. A sleeve-shaped molded product was produced by winding so as to be arranged at a pitch of 0.5 mm, further winding a rolled sheet of the rubber composition shown in Table 3 from above, pressurizing and vulcanizing. By cutting this into a predetermined width, a toothed belt with a belt width of 5 mm having tooth portions with a number of teeth of 500 and a pitch of 1.411 mm was obtained.

The toothed belt thus obtained has a good tooth shape, and the tooth height standard is 0.49 mm to 0.
With respect to 55 mm, 0.538 mm was in the center of the standard, and the rubber was not exposed from the texture of the tooth cloth of the tooth portion, and the rubber was not attached to the surface of the tooth cloth.

(Comparative Example) Using a warp yarn obtained by aligning and twisting two yarns of 40 denier 6 nylon, and a weft yarn obtained by aligning and twisting two yarns of 40 denier wooly 6 nylon. Warp density 170 threads / 3 cm, weft density 1
A satin-woven canvas woven at 75/3 cm was used, and this canvas was vibrated in water to shrink it to about ½ of the width at the time of weaving. Next, RFL is applied to this canvas in the same manner as in the embodiment.
The solution was treated twice to obtain a tooth cloth having a solid content of RFL of 40% by mass. The cloth cover of this tooth cloth had a cross cover factor of 0.964.

Then, using this tooth cloth, the endless tubular tooth cloth having the wefts in the circumferential direction is put on the mold in the same manner as in the embodiment, and the number of teeth is 200 and the pitch is 2.0 mm.
A toothed belt having a tooth width of 6 mm was obtained. In the toothed belt thus obtained, the rubber was seeping out from the tooth cloth. The tooth height of the teeth is 0.49 mm to 0.55 m.
The value was 0.49 mm, which was close to the lower limit of the standard value of m.

[0026]

[Table 1]

[0027]

As described above, according to the present invention, the back rubber portion in which the core wire is embedded, and the plurality of tooth rubber portions arranged in the back rubber portion at a predetermined pitch in the longitudinal direction of the belt. A toothed belt including a belt body, and a tooth cloth covered on the tooth rubber portion side of the belt body, wherein the tooth cloth uses warp yarns twisted independently one by one and has a cross cover factor of 0. .9
0 to 0.92, the warp yarn density is higher than the weft yarn density, and the weaving structure is such that the exposed amount of the twisted yarn extending in the belt width direction and the twisted yarn extending in the belt longitudinal direction is on both sides of the tooth cloth. Differently configured in a 1/3 random twill weave,
In addition, the tooth cloth surface with a large exposed amount of twisted yarn extending in the belt width direction is located on the outside, and the tooth cloth surface with a large exposed amount of twisted yarn extending in the belt longitudinal direction is located on the tooth rubber layer side. Since the toothed belt is made by using the canvas treated with only the latex liquid, the canvas forming the toothed cloth has a small mesh opening, and the toothed belt is worn for a long time due to wear. In addition, it is possible to prevent the scattering of rubber powder due to the opening of the texture of the tooth cloth, and it is easy to form the tooth shape The dimensional accuracy is also high. Further, since the weft yarns, which have a smaller density than the warp yarns, are exposed on the tooth rubber layer side, the adhesiveness with the tooth rubber layer and the impregnation with the treatment liquid are improved, and the separation phenomenon between the tooth cloth and the tooth rubber layer occurs. Has the effect of being suppressed.

According to the invention described in claim 2, when the warp of the canvas forms the tooth cloth of the toothed belt, the toothed belt according to claim 1 extends along the width direction of the toothed belt. Therefore, since each warp is independently twisted,
Without limiting the elongation of the weft thread along the belt longitudinal direction, the canvas can be easily stretched in the longitudinal direction of the toothed belt, so that the tooth shape can be easily obtained and the tooth size can be more accurately formed. .

As the tooth cloth, a resorcin-formalin-latex liquid having a solid content of 30 to 50% by mass was used. Therefore, the surface of the tooth cloth was coated with the solid resin of the RFL liquid. The expansion of the tooth cloth can be made small, and the mesh opening of the tooth cloth is unlikely to become large, and the effect of preventing the scattering of rubber powder due to the mesh opening of the tooth cloth is enhanced. Is what you can get.

In the invention of claim 4, the density of the warp yarns of the tooth cloth is about three times that of the weft yarns. Therefore, when the weave design is 1/3 random twill weave, It is more effective in suppressing rubber bleeding, abrasion resistance of the belt, and suppressing peeling phenomenon between the tooth cloth and the tooth rubber layer.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an example of an embodiment of a toothed belt.

FIG. 2 is a woven structure diagram of a 1/3 random twill weave cloth.

FIG. 3 is a weave structure diagram of a 2/2 twill tooth cloth.

[Explanation of symbols]

1 core wire 2 Belt body 3 teeth 4 Tooth bottom 5 tooth cloth

Continued front page    F-term (reference) 4L033 AA08 AB05 AC11 CA34 CA68                 4L048 AA24 AB07 AB11 AB12 AC09                       BA01 CA15 DA44

Claims (4)

[Claims] 1. A belt main body comprising a back rubber portion having a core wire embedded therein and a plurality of tooth rubber portions arranged on the back rubber portion at a predetermined pitch in the longitudinal direction of the belt. A toothed belt in which a tooth cloth is adhered to the tooth rubber portion side, wherein the tooth cloth uses warp threads independently twisted one by one and has a cross cover factor of 0.90 to 0.92. Furthermore, the density of the warp yarns is higher than that of the weft yarns, and further, the woven structure is such that the exposed amount of the twisted yarn extending in the belt width direction and the exposed amount of the twisted yarn extending in the belt longitudinal direction differ on both sides of the tooth cloth. The tooth cloth surface, which is constructed in a weave and has a large exposed amount of twisted yarns extending in the belt width direction, is positioned on the outside, and the tooth cloth surface that has a large amount of exposed twisted yarns extending in the belt longitudinal direction is positioned on the tooth rubber layer side. , Resorcin-formalin-
A toothed belt characterized by using a canvas treated only with a latex liquid. 2. The toothed belt according to claim 1, wherein when the warp threads of the canvas form the toothed belt, the toothed belt extends along the width direction of the toothed belt. 3. The toothed belt according to claim 1 or 2, wherein a tooth cloth having a resorcin-formalin-latex liquid content of 30 to 50% by mass of solid content is used. 4. The toothed belt according to claim 1, wherein the density of the warp yarns of the tooth cloth is approximately three times the density of the weft yarns.