JP2000130515A - Transmission belt and manufacturing process thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission belt and its manufacturing process wherein a span of manufacturing time for tubulous belt canvas fabric is sharply shortened, and there are no creases happening in this tubulous belt canvas fabric during the spinning process, besides preventing any offensive sound due to stickiness and wrinkledness on the backside, from occurring. SOLUTION: A manufacturing process of this transmission belt consists of the following procedures 1) rubber is subject to friction only onto one side of the canvas fabric, 2) tubulous canvas fabric 4 is manufactured upon butt- jointing both width ends of the canvas fabric so as to make a surface where no rubber is stuck, come to the inside, 3) this tubulous canvas is spirally cut off, thereby producing the open inverse canvas fabric, 4) this open inverse canvas fabric is cut into the specified length, thereby producing a tubulous belt canvas fabric upon jointing the cut ends of the canvas fabric so as to make the no rubber surface come to the inside, 5) this belt canvas fabric is fitted in a cylindrical metal mold, winding an unvulcanized rubber sheet, a core and another unvulcanized rubber sheet from the upside of this canvas fabric in order, thereby producing a belt sleeve, and 6) this vulcanized belt sleeve is taken out of the cylindrical metal mold and then it is cut into a ring form, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power transmission belt and a method of manufacturing the same, and more particularly, to a power transmission belt in which a wrinkle does not occur in a tubular belt canvas in a spinning process and sound generation due to adhesion on a back surface is prevented, and a method of manufacturing the same. It is about.

[0002]

2. Description of the Related Art A V-ribbed belt has a core wire buried in an adhesive rubber layer, and a cover canvas is laminated on the adhesive rubber layer.
A plurality of ribs are provided below the adhesive rubber layer. This V-ribbed belt is widely used in place of the V-belt for power transmission of auxiliary equipment such as an air compressor and an alternator of an automobile. The cover canvas used here is provided mainly for maintaining the warp resistance of the belt, and is obtained by subjecting a plain woven fabric in which warp and weft yarns are woven to rubber treatment (friction).

Conventionally, a woven fabric widely used as a back canvas of a V-ribbed belt is a plain woven fabric having a crossing angle of 90 ° between warp and weft, which is mechanically treated, that is, tentered, so that both yarns are moved in the longitudinal direction of the belt. Wide angle processing crossing at 120 °. The basic structure of this canvas is a cotton fabric in which the number of belts to be driven is 10 or more / 10 mm for both warp and weft yarns, and the single yarn tensile force is 9 N or more / 10 cotton fiber yarns.
The plain fabric is forcibly subjected to a wide angle treatment, that is, a tenter treatment, with a spun yarn of 0%, so that the number of yarns driven by the belt is set to 14 or more / 10 mm for both the warp and the weft.

After the so obtained wide-angle canvas (biased canvas) is soaked with rubber glue, it is cut at a bias of 45 ° to form a cut, which is then cut on a workbench. Both ends of the belt were joined together by sewing with an overlock or the like, and joining was repeated until a length exceeding the outer peripheral length of the belt was obtained. The long web was cut to a length corresponding to the outer peripheral length of the belt at a bias of 45 °, and this was joined with a sewing machine to finish it into a cylindrical cover canvas.
Furthermore, at the end of the long web cut in this manner, both ends are cut so as to be in a direction perpendicular to the longitudinal direction of the long web, and the both ends are joined by a sewing machine to form a cylindrical shape. I had a cover canvas.

Further, as another method, the woven cloth is cut at a bias of 45 ° with respect to the length direction so that the warp and the weft are 90 °.
The canvas is stretched in the longitudinal direction and cut at a crossing angle of 90 ° or more between the warp and the weft, and the cut ends of the canvas are joined to each other by joining with a sewing machine. It was finished in shaku canvas. It is known that this long canvas is cut into a predetermined length, and both ends are butted together and joined by sewing to form a cylindrical canvas.

[0006]

However, as in the conventional method, in the case where a long-length canvas is joined by a sewing machine and the long-length canvas is further finished into a cylindrical canvas, there are many joint points. There was a problem that required working time. Moreover, in the case of the soaked canvas, when the canvas is softened and the cord is spun on it, wrinkles occur, and when it becomes a belt, wrinkles appear on the back, which becomes a step and the belt Noise sometimes occurred when driving.

[0007] Further, a method of forming a tubular canvas using a woven fabric is also a method of extending the longitudinal direction of the continuous canvas in order to process the crossing angle between the warp and the weft of the canvas to a wide angle. The width became shorter and the joints were increased to make it a wide-angle canvas. For this reason, the tubular canvas has at least two joints, so that there is a problem that the number of joints is large and work time is required.

The present invention has been made in view of the above-mentioned situation, and has been made in response to the above-mentioned problem, and has greatly reduced the manufacturing time of a tubular belt canvas. In addition, wrinkles of the tubular belt canvas do not occur during a spinning process. It is an object of the present invention to provide a power transmission belt in which sound generation due to adhesion and wrinkles is prevented on the back surface, and a method for manufacturing the same.

[0009]

That is, the invention according to claim 1 of the present application comprises: a stretch rubber layer having a cover canvas laminated on a surface thereof;
An adhesive rubber layer with a core buried along the belt longitudinal direction,
In a method for manufacturing a power transmission belt in which a compression rubber layer is disposed adjacent to an adhesive rubber layer, a warp thread positioned parallel to the longitudinal direction and a crossing angle with respect to the warp are set to 90 ° or more. A step of frictionalizing the rubber on only one side of the canvas composed of the arranged weft yarns, a step of producing a tubular canvas by butt-joining the width ends of the canvas so that the surface on which the rubber is not frictionally inwardly faces, A step of producing an open canvas in which the warp and the weft are arranged at an equal angle to each other with respect to the longitudinal axis, cutting the open canvas into a predetermined length, and removing a surface on which rubber is not frictioned. A step of manufacturing a tubular belt canvas by joining the cut ends of the canvas so as to be on the inside, inserting the belt canvas into a cylindrical mold, and unvulcanized rubber sheet, core wire from above the canvas; , Not The step of producing sequentially wound belt sleeve vulcanized rubber sheet, a step of cutting the ring is taken out vulcanized belt sleeve from the cylindrical mold, in the manufacturing method of the driving belt consisting of. In the present invention, in particular, an open tubular fabric in which a narrow tubular canvas is manufactured by butt-joining the width ends of the canvas, and this is cut into spirals, and the warp and the weft are arranged at an equal angle to each other with respect to the longitudinal axis. As a result, the number of sewing machine joints is reduced compared to the conventional method, the production time of belt canvas can be shortened, and wrinkling of the cylindrical belt canvas does not occur in the spinning process, and the back side has an adhesive It becomes a power transmission belt that prevents sound generation due to wrinkles.

[0010] The invention according to claim 2 of the present application is a method of manufacturing a power transmission belt that performs an RFL process before friction of rubber on one surface of a canvas.

The invention according to claim 3 of the present application resides in a method for manufacturing a transmission belt in which the canvas is a plain woven canvas in which the warp and the weft intersect at an angle of 90 °.

[0012] The invention according to claim 4 of the present application is a method for manufacturing a power transmission belt, wherein the canvas is a wide-angle canvas obtained by performing a tenter process for mechanically increasing the crossing angle between the warp and the weft.

The invention according to claim 5 of the present application is a method of manufacturing a power transmission belt which is a V-ribbed belt manufactured by grinding a plurality of ribs extending in a circumferential direction of the belt in a compressed rubber layer.

According to a sixth aspect of the present invention, a vulcanized belt sleeve is hung on at least a fixed driving roll and a movable tension roll, and a plurality of V-shaped belts are provided on at least one of an extension side and a loose side of the belt sleeve. The belt is provided movably with a protruding portion, and the belt sleeve is moved under a predetermined tension, and the V-shaped groove portion is ground in accordance with the grinding amount while the V-shaped groove portion is ground by a rotated grindstone. There is provided a method of manufacturing a power transmission belt in which a protrusion is advanced so as to be fitted into a V-shaped groove of a belt sleeve and ground while forcibly guiding the belt sleeve to produce a V-ribbed belt.

According to a seventh aspect of the present invention, there is provided an extension rubber layer having a cover canvas laminated on a surface thereof, an adhesive rubber layer having a core wire buried along the longitudinal direction of the belt, and a compression rubber layer adjacent to the adhesive rubber layer. , The cover canvas is a tubular canvas obtained by joining at least one or more butt joints, and the transmission belt has no rubber attached to the belt exposed surface.

The invention according to claim 8 of the present application is a V-ribbed belt having a plurality of ribs extending in a circumferential direction of the belt in a compressed rubber layer.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a plan view of a transmission belt canvas used in the present invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. 3 is a step of a method for manufacturing a transmission belt canvas according to the present invention. Fig. 4 is a view showing a state in which an elongated tubular canvas is produced by butt-joining, Fig. 4 is a view showing a state in which the tubular canvas is cut spirally in the longitudinal direction, and Fig. FIG. 6 is a perspective view of a canvas for a power transmission belt obtained by cutting the open canvas into a predetermined length and joining the ends of the canvas.

First, as shown in FIG. 1, a plain weave canvas in which the warp yarn 2a and the weft yarn 2b made of synthetic fibers such as polyester, nylon, aramid, vinylon or the like or natural fibers such as cotton, and their intersecting yarns have an intersection angle of 90 °. Prepare 1
Thereafter, the plain-woven canvas 1 is subjected to an adhesive treatment by RFL treatment, and at the same time, the canvas is solidified to prevent wrinkles of the cylindrical belt canvas in the spinning process.

The RFL solution used here is a mixture of an initial condensate of resorcinol and formalin, and a rubber latex. It is suitable for increasing the value. The initial condensate of resorcinol and formalin is
This is mixed with latex such that the resin content is 10 to 100 parts by weight with respect to 100 parts by weight of the rubber content of the latex, and the total solid content is adjusted to a concentration of 5 to 40%.

The latex is styrene-butadiene-
Vinylpyridine terpolymer, chlorosulfonated polyethylene, hydrogenated nitrile rubber, epichlorohydrin,
Latex such as natural rubber, SBR, chloroprene rubber, and olefin-vinyl ester copolymer.

Thereafter, as shown in FIG. 2, rubber R is frictionally applied to one surface of the plain woven canvas 1 subjected to the RFL treatment. In this friction step, the plain woven canvas 1 and unvulcanized rubber such as chloroprene, hydrogenated nitrile rubber and the like are passed between a pair of rolls, and rubber is rubbed on one surface of the plain woven canvas 1.

Subsequently, as shown in FIG. 3, the width ends of the plain-woven canvas 1 are butted so that the surface on which the rubber is not frictioned is on the inside, and, for example, cotton yarn is used in the longitudinal direction (a). A tubular canvas 4 having one joint 3 is formed by sewing with overlock or the like.

As shown in FIGS. 4 and 5, the tubular canvas 4 is spirally cut at 45 ° to the longitudinal direction (a) as shown by a cutting line 5 so that the warp yarns 2a and the weft yarns 2b are elongated. A continuous open canvas 7 arranged at an equal angle to the direction (a) is produced and wound around the reel 6. This open cloth 7 maintains the crossing angle between the warp yarn 2a and the weft yarn 2b at 90 °, but each of the yarns 2a and 2b is 45 ° in the longitudinal direction (A).
The joints 3 are also arranged at predetermined intervals in the 45 ° direction.

FIG. 6 shows that the crossing angle between the warp yarn 2a and the weft yarn 2b is 9
This shows a step of producing a tubular belt canvas 8 from the 0 ° open canvas 7, and after cutting the open canvas 7 to a predetermined length, the rubber free friction surface is turned inside. By joining the cut ends, a tubular belt canvas 8 having joints 9 and 3 of one right-angle joint line and a bias joint line can be manufactured.

FIG. 7 shows an elongated wide-angle canvas 1 consisting of a warp yarn 2a positioned parallel to the longitudinal direction (a) and a weft yarn 2b arranged so that the crossing angle becomes 120 °. Has become. This wide-angle canvas 1 is obtained by performing a tenter process for forcibly increasing the crossing angle between the warp yarn 2a and the weft yarn 2b. Even when the canvas 1 is used, the wide-angle canvas 1 is butt-stitched with a sewing machine joint as in the method shown in FIGS. On the other hand, after cutting spirally in the direction of 60 ° to produce the open canvas 7 in which the warp yarn 2a and the weft yarn 2b are arranged at an equal angle to the longitudinal axis, the open canvas 7 is cut into a predetermined length. It can be cut and the cut ends of the canvas can be joined to produce a belt canvas 8.

The obtained tubular belt canvas 8 is used for producing a belt sleeve 10. FIG. 8 is a partial cross-sectional view of a belt sleeve used in the present invention. A cylindrical belt canvas 8 is inserted into the peripheral surface of a cylindrical mold M. Guess. Then, a cushion rubber layer 40 is further formed thereon, and a cord 41 formed of a rope is spirally spun. In this spinning process, wrinkles do not occur because the cylindrical belt canvas 8 is hardened by friction with rubber. Furthermore, aramid fiber, polyester fiber,
A cut fiber 42 having a length of 1 to 10 mm made of nylon fiber, cotton, or the like is mixed in an amount of 1 to 15 vol%, and rubber layers 43 arranged in the width direction of the belt sleeve 10 are sequentially laminated.
This laminate is vulcanized to form a belt sleeve 10.

The belt sleeve 10 is ground by a grinder 34 shown in FIG. 9 to produce a V-ribbed belt having a V-shaped groove having an accurate angle. That is, the belt sleeve 10 is wound around the drive roll 11 and the tension roll 12 so that the rubber layer 43 is positioned on the front side, and is run under a predetermined tension. The traveling speed is not particularly limited, but is usually preferably 50 to 100 mm / sec. A grinding wheel 13 having a plurality of V-shaped protrusions 14 on its surface is disposed so as to be able to move forward and backward at a position close to the drive roll 11, and constantly presses the running belt sleeve 10 to constantly move the belt sleeve 1.
On the surface of 0, 3 to 100 V-shaped grooves 43 are ground at one time. The direction of rotation of the grindstone 13 may be the same as or opposite to that of the belt sleeve 10, but in the case of this embodiment, the direction of rotation is reversed to increase the grinding efficiency. This whetstone 1
The rotation speed of No. 3 is set at 400 to 2,000 rpm.

The grinding wheel 13 is a grinding wheel having diamond grindstones of 100 to 150 mesh, and a plurality of circumferentially continuous V wheels corresponding to rib ridges of a V-ribbed belt.
The rotating shaft of the grinding wheel main body is connected to a motor as a rotating means of the grinding wheel, and as a reciprocating moving means for pressing against the belt sleeve 10 during running. And a structure in which the grinding wheel body is connected to a ball screw connected to a servomotor.

A part of the polishing powder such as rubber or fiber attached to the surface of the grinding stone 13 is removed from the duct 1 surrounding the grinding stone 13.
The abrasive powder that has been sucked out of the grinder 5 and discharged to the outside of the grinder 34 and the abrasive powder adhered to the belt sleeve 9 also
Is immediately discharged to the outside while being dropped.

The brush 17 is made by implanting a filament of a synthetic fiber such as nylon or polyester or a metal wire such as brass on the surface of a support rod, and is in contact with the surface of the belt sleeve 10.

Further, the vacuum device 18 is inserted into a cover member 21 which partially surrounds the brush 17, and the abrasive powder removed from the brush 17 is discharged to the outside by operating the suction device 20. . A plurality of suction devices 20 may be provided. When the abrasive powder attached to the surface of the belt sleeve 10 is removed by the brush 17, the abrasive powder is sucked into the suction device 20 from the inside of the cover member 21 and discharged to the outside of the grinding device 34 via the pipe.

Thus, in this embodiment, the idle roll 23 provided with the plurality of V-shaped protrusions 22 moves back and forth toward the belt sleeve 7 on both the extension side 24 and the loose side 25 of the belt sleeve 10. The belt sleeve 10 is forcibly guided by advancing so that the V-shaped projection 22 of the cache roll 23 fits into the V-shaped groove 38 of the belt sleeve 10 according to the grinding amount.

The shaft 27 of the above-mentioned cache roll 23 is connected to a rod 29 of a cylinder 28, and moves forward and backward toward the belt sleeve 9 by the operation of the cylinder 28. A pulse generator 30 incorporated in the cylinder 29 serves as a detection sensor. The change amount (displacement amount) of the catch roll-position, that is, the catch roll- is detected. In this embodiment, the catch roll 23 is connected to the extension side 24 of the belt sleeve 10.
Or only one of the loose side 25.

As shown in FIG. 9, during the grinding, when the belt sleeve 10 meanders by the distance A to generate a thrust force F in the width direction, the thrust force F is transmitted to the catch roll 23, and the component force P The cache roll 23 is pushed back from the state shown by the dotted line to the state shown by the solid line. When the displacement B to be pushed back becomes larger than a predetermined value, the axis 31 of the tension roll 12 is
The belt sleeve 9 is twisted in parallel so as to keep the distance between the shaft centers 32 constant, and the running of the belt sleeve 9 is corrected for stable running.

When the belt sleeve 10 is running stably without meandering, the displacement of the cache roll is in a linear relationship with the grinding time. However, when the belt sleeve 10 meanders and a thrust force in the width direction is generated, the catch roll 23 moves. Is pushed back, the amount of displacement decreases, and when the amount of decrease falls into a region C exceeding a threshold value indicated by a two-dot chain line, it is determined that the vehicle is running unstable.
2 and the shaft center 32 of the drive roll 11.
Twist to maintain a constant spacing between
The running of the belt sleeve 10 is stabilized, and when the displacement amount of the cache roll 23 falls within the threshold value again, grinding is restarted. Of course, when an abnormal value of displacement occurs,
The running of the belt sleeve 9 may be corrected after the grindstone 13 is retracted and the rotation is stopped.

As shown in FIG. 11, the obtained V-ribbed belt 35 has a plurality of rib ridges 37 on a compression rubber layer 36 in which cut fibers made of aramid fiber, polyester fiber, nylon fiber, cotton, etc. are arranged in the width direction of the belt. A cord 41 having a rib valley 38 and made of a rope in a cushion rubber layer 39
And a belt canvas 8 is further laminated on the surface. Since no wrinkles occur on the belt canvas 8 and no rubber adheres to the back surface, it is possible to prevent sound generation due to adhesion.

The V-ribbed belt 35 is not limited to the above-described manufacturing method. For example, the V-ribbed belt 35 is hung on the driving roll 11 to which the belt sleeve 10 is fixed and the movable tension roll 12 and The V-shaped groove portion 43 can also be ground by the grindstone 13 rotated without using.

In the present invention, the present invention is not limited to the above-described V-ribbed belt, but can be applied to a V-belt, a toothed belt, and a flat belt.

[0039]

As described above, in the invention described in each of the claims of the present application, particularly, the width end of the canvas is butt-jointed to produce an elongated tubular canvas, which is cut into a spiral so that the warp and the weft are oriented in the longitudinal direction. The number of sewing machine joints can be reduced compared to the conventional method, making it possible to shorten the time required to manufacture canvas for belts. As a result, no wrinkling occurs due to the use of a tubular belt canvas with friction of rubber only, and the absence of rubber on the back of the belt results in a transmission belt that can prevent sound due to sticking and wrinkling.

Further, in the method of manufacturing a power transmission belt using a tubular belt canvas, the number of sewing machine joints can be reduced as compared with the conventional method, and the manufacturing time of the tubular canvas can be shortened. Since there is no step, there is an effect that a transmission belt can be obtained without generating noise during belt running.

In the method of manufacturing a V-ribbed belt among the power transmission belts, the V of the
A V-ribbed belt having a V-shaped groove portion having an accurate angle can be manufactured in order to advance the convex portion so as to fit into the V-shaped groove portion of the belt sleeve and to forcibly guide the belt sleeve.

[Brief description of the drawings]

FIG. 1 is a plan view of a transmission belt canvas used in the present invention.

FIG. 2 is a sectional view of FIG. 1;

FIG. 3 shows a method for manufacturing a canvas for a power transmission belt according to the present invention.
It is a figure which shows the process which was the process and produced the cylindrical canvas by butt-joining the width edge of the plain-woven canvas.

FIG. 4 is a diagram showing a tubular canvas cut spirally in the longitudinal direction.

FIG. 5 is a view showing a state in which the open canvas is being finished.

FIG. 6 is a perspective view of a transmission belt canvas obtained by cutting an open canvas into a predetermined length and joining ends of the canvas.

FIG. 7 is a plan view of a wide-angle canvas in which the crossing angle between the warp and the weft is 120 °.

FIG. 8 is a partial sectional view of a belt sleeve.

FIG. 9 is a front view showing a state in which the belt sleeve is being ground.

FIG. 10 is a diagram showing a state in which a V-shaped protrusion of a cache roll is fitted into a V-shaped groove of a belt sleeve.

FIG. 11 is a sectional perspective view of a V-ribbed belt obtained by the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Canvas 2a Warp 2b Weft 4 Cylindrical canvas 7 Open canvas 8 Cylindrical belt canvas

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16G 1/08 F16G 1/08 D 1/28 1/28 G 5/20 5/20 A

Claims (8)

[Claims] 1. Manufacture of a power transmission belt having a stretch rubber layer having a cover fabric laminated on the surface thereof, an adhesive rubber layer having a core wire buried along the longitudinal direction of the belt, and a compression rubber layer adjacent to the adhesive rubber layer. A method of frictioning rubber on only one side of a canvas consisting of a warp positioned parallel to the longitudinal direction and a weft arranged such that the crossing angle is 90 ° or greater. So that the non-frictional surface is on the inside,
Producing a tubular canvas by butt-joining the width ends of the canvas, and cutting the spiral into spirals to produce an open canvas in which warp and weft yarns are arranged at equal angles to each other with respect to the longitudinal axis. Cutting the open canvas into a predetermined length, and joining the cut ends of the canvas so that the surface on which the rubber is not frictioned is on the inner side to produce a tubular belt canvas. A step of inserting a non-vulcanized rubber sheet, a core wire, and an unvulcanized rubber sheet sequentially from above the canvas into a cylindrical mold to form a belt sleeve, and removing the vulcanized belt sleeve from the cylindrical mold. A method for producing a power transmission belt, comprising the steps of: 2. The method for manufacturing a power transmission belt according to claim 1, wherein RFL treatment is performed before rubber is frictionally applied to one surface of the canvas. 3. The method for producing a power transmission belt according to claim 1, wherein the canvas is a plain-woven canvas in which the warp and the weft intersect at an angle of 90 °. 4. The method for producing a power transmission belt according to claim 1, wherein the canvas is a wide-angle canvas obtained by performing a tenter treatment for mechanically increasing a crossing angle between a warp and a weft. 5. The method according to claim 1, wherein the V-ribbed belt is formed by grinding a plurality of ribs extending in a circumferential direction of the belt in the compressed rubber layer. 6. A catch roll in which a vulcanized belt sleeve is hung on at least a fixed driving roll and a movable tension roll, and a plurality of V-shaped protrusions are provided on at least one of an extension side and a loose side of the belt sleeve. The belt sleeve is moved under a predetermined tension, and the V-shaped groove portion is ground by a rotated grindstone. 6. The method for producing a power transmission belt according to claim 5, wherein the V-ribbed belt is manufactured by advancing the belt sleeve so as to be fitted into the groove and forcibly guiding the belt sleeve. 7. A transmission belt in which a stretch rubber layer having a cover canvas laminated on a surface thereof, an adhesive rubber layer having a cord embedded in the longitudinal direction of the belt, and a compression rubber layer disposed adjacent to the adhesive rubber layer, The cover canvas is a tubular canvas obtained by at least one or more butt joints,
A power transmission belt characterized in that no rubber is attached to the exposed surface of the belt. 8. The power transmission belt according to claim 7, wherein the power transmission belt is a V-ribbed belt having a plurality of ribs extending in a circumferential direction of the belt in the compression rubber layer.