JP2002340102A - Manufacturing method for low edge belt and low edge belt transmission system obtained by using the same method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method for a low edge belt for suppressing generated amount of waste rubber and increasing the number to be taken and a low edge belt transmission system capable of avoiding core wire peeling even in a wear state of a belt side surface. SOLUTION: This method manufactures the low edge belt constituted of a compression layer and a cushion rubber layer and having a V-shape in cross section. The method is characterized by including a press for forming a vulcanized sleeve made of members composing the low edge belt on a cylindrical mold, a process for vertically cutting the vulcanized sleeve in the longitudinal direction and cutting a ring-shaped molded body of a square shape in cross section, and a process for leaving both edges for forming an outer peripheral surface of the ring-shaped molded body at a right angle, polishing both side surfaces of the ring-shaped molded body and forming the V-shape in cross section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a low-edge belt and a low-edge belt transmission system obtained by using the method. More specifically, the present invention relates to a low-edge belt in which generation of waste rubber is suppressed and belt productivity is improved. And a low-edge belt transmission system that does not involve core stripping.

[0002]

2. Description of the Related Art A low-edge belt having a V-shaped cross section is usually produced by cutting a vulcanization sleeve comprising a reinforcing cloth, a rubber sheet and a rope, which are constituent members thereof, into a ring. That is, as schematically shown in FIG. 5, while the vulcanizing sleeve 10 is being rotated, a ring-shaped molding having a V-shaped cross section is performed by two rotating cutters 11 provided with an inclination angle corresponding to the V-shaped cross section of the low edge belt. The body is cut out, and then the entire side surface of the ring-shaped formed body is polished, or the ring-shaped formed body having a square cross section is cut out while rotating the vulcanization sleeve, and then both sides of the ring-shaped formed body having the square cross section The surface is polished to obtain a low-edge belt having a V-shaped cross section.

[0003]

Here, in the conventional method for manufacturing a low-edge belt, as shown in FIG. 1A, a low-edge belt 1 having an upper width W1 is cut out by cutting to form a V-shaped cross section. However, there was a problem that the black-painted portion in the figure inside the vulcanized sleeve became a large amount of waste rubber. For this reason, the number of low-edge belts (number of strips) cut out from one vulcanization sleeve is limited, which has led to low belt productivity.

On the other hand, a conventional low edge belt comprises a compression layer comprising a reinforcing cloth 2 and a compression rubber layer 3, a core wire 4, and a cushion rubber layer 5, as shown in FIG. It is wound around a V-groove pulley 31 having a groove, and is used in a state in which both side surfaces of the pulley 31 are in sliding contact with the V-groove. Here, while maintaining a small gap between the side surface of the cushion rubber layer 5 in which the core wire 4 is embedded and the V-groove pulley 31, only the lower portion of the cushion rubber layer 5 is V-shaped. The power is transmitted in sliding contact with the groove pulley 31. However, when the side surface of the low edge belt below the lower half of the cushion rubber layer 5 wears over time, the entire low edge belt 1 falls into the V-groove pulley 31, and the cushion rubber layer which has not been in contact with the V-groove pulley 31 until then. 5 comes into contact with the V-groove pulley, and that portion is pushed up by the V-groove pulley 31 so that the core 4
However, there was a phenomenon in which so-called core stripping occurred, in which the belt stripped from the cushion rubber layer 5, leading to early belt failure. This phenomenon was particularly remarkable in a belt used in a large vehicle engine having an extremely large rotational fluctuation rate and an inertial load, particularly a generator engine for construction machinery.

[0005] The present invention relates to the above-mentioned problems, and provides a method for producing a low-edge belt in which the amount of scrap rubber generated in the production stage is suppressed and the number of strips is increased. An object of the present invention is to provide a low-edge belt transmission system capable of avoiding peeling.

[0006]

That is, the invention according to claim 1 of the present application is directed to a section V having a compression layer and a cushion rubber layer.
A method of manufacturing a low-edge belt having a shape, comprising: forming a vulcanization sleeve made of a member constituting a low-edge belt on a cylindrical mold; cutting the vulcanization sleeve perpendicularly to a longitudinal direction to form a ring having a rectangular cross section. Cutting out a shaped body, and polishing both sides of the ring-shaped body while leaving both edges forming an outer peripheral surface of the ring-shaped body at a right angle to form a V-shaped cross section. Is a method for producing a low edge belt.

According to a second aspect of the present invention, there is provided a method of manufacturing a low-edge belt having a V-shaped cross section comprising a compression layer and a cushion rubber layer, wherein a vulcanization sleeve comprising a member constituting the low-edge belt is formed on a cylindrical mold. Forming a vulcanized sleeve, cutting the vulcanized sleeve perpendicularly to the longitudinal direction to cut out a ring-shaped molded body having a square cross section, and polishing only the compression layer on both side surfaces of the ring-shaped molded body to obtain a cross section V A method for producing a low edge belt, comprising a step of forming a shape.

According to a third aspect of the present invention, there is provided a low-edge belt transmission system including a low-edge belt having a V-shaped cross-section and a V-groove pulley comprising a compression layer and a cushion rubber layer, wherein both edges forming the upper surface of the low-edge belt are at right angles. And the width of the upper surface of the low-edge belt is not more than the groove width at the outermost circumference of the V-groove pulley.

According to a fourth aspect of the present invention, there is provided a low-edge belt transmission system including a low-edge belt having a V-shaped cross-section and a V-groove pulley, the V-groove pulley being in contact with the cushion rubber layer. This is a low-edge belt transmission system characterized by not being performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing a low-edge belt according to the present invention and a low-edge belt transmission system obtained by using the method will be described below. Low edge belt 1
As shown in FIG. 2, in order from the lower surface of the belt to the upper surface of the belt, a compression layer including a reinforcing cloth 2 and a compression rubber layer 3;
It is composed of a cushion rubber layer 5 in which the cord 4 is embedded and a reinforcing cloth 6. The low edge belt of the present invention also includes a so-called low edge cogged belt having a cog portion on the compressed rubber layer 3 and a low edge double coged belt having a cog portion on the belt upper surface. It also includes a belt in which an extension layer is disposed above a cushion rubber layer.

The method of manufacturing the low edge belt 1 includes a step of cutting the vulcanized sleeve into a ring. The vulcanized sleeve is formed by winding members constituting the reinforcing cloth 2, the compression rubber layer 3, the cushion rubber layer 5, the core wire 4, and the reinforcing cloth 6 of the low-edge belt in order in a cylindrical mold and vulcanizing them. It is a cylindrical molded body. Specifically, the reinforcing cloth 2
, An unvulcanized rubber sheet forming the compressed rubber layer 3, an unvulcanized rubber sheet forming the lower cushion rubber layer, a rope serving as a core wire, an unvulcanized rubber sheet forming the upper cushion rubber layer, And the canvas forming the reinforcing cloth 6 is sequentially wound and then vulcanized.

The canvas constituting the reinforcing fabrics 2 and 6 is a canvas in which polyester fiber, nylon fiber or the like is woven in plain weave, twill weave, satin weave, or the like. The material is friction coated to make a canvas with rubber.

The rubber used for the compressed rubber layer 3 includes chloroprene rubber (CR), hydrogenated nitrile rubber (HNB)
R), HNBR in which unsaturated carboxylic acid metal salts are dispersed, chlorosulfonated polyethylene (CSM), natural rubber,
A single material such as styrene-butadiene rubber (SBR) and butadiene rubber (BR) or a blend thereof may be used.

In the case of a low-edge cogged belt having a cog portion in the compression rubber layer 3, a rubber sheet forming the compression rubber layer and a reinforcing cloth are placed on a flat mold in which teeth and grooves are alternately arranged. A rubber sheet that forms a compressed rubber layer that has been previously shaped into a cog shape by pressing is prepared. Alternatively, a rubber sheet in which teeth and grooves are alternately arranged is formed into a columnar shape, covered with a mold, and simultaneously molded by vulcanization.

The core wire 4 is preferably a low-stretch and high-strength rope. For example, a rope obtained by twisting an organic fiber such as aramid fiber, polyamide fiber or polyester fiber, an inorganic fiber such as glass fiber, or a metal fiber can be used. Used. This rope is strongly bonded to the cushion rubber layer by RFL treatment and rubber paste application. The treated rope is wound on the cylindrical mold around which the reinforcing cloth is wound at a constant pitch in the longitudinal direction, that is, in the width direction of the low edge belt, and forms a core wire of the low edge belt.

As the rubber used for the cushion rubber layer 5, the same rubber as the rubber used for the compressed rubber layer 3 is used. The cushion rubber layer is usually laminated separately as a lower cushion rubber layer on the lower side of the belt and an upper cushion rubber layer on the upper side of the belt. Works to alleviate the stress between each member.

Subsequently, a canvas which becomes the same reinforcing cloth 6 as the reinforcing cloth 2 adhered to the compressed rubber layer 3 is wound.

The mold is inserted into a vulcanizing can and vulcanized at a predetermined pressure and temperature to obtain a vulcanized sleeve.

While rotating the obtained vulcanization sleeve,
It is cut at a predetermined width in a direction perpendicular to the longitudinal direction of the vulcanization sleeve to obtain a ring-shaped formed body having a square cross section shown in FIG. Here, the predetermined width is, for example, W2 shown in FIG. 1B, and is substantially smaller than W1 in FIG. 1A. Specifically, as shown in FIG. 3, W2 is set to be equal to or less than the groove width at the outermost periphery of the V-groove pulley 31 constituting the transmission system. At this time, in consideration of the transmission performance of the belt, the number of core wires in the cross section perpendicular to the belt longitudinal direction of the low edge belt of FIG.
The setting is made so as not to decrease as compared with the number of core wires of the low edge belt in (a).

A low-edge belt having a V-shaped cross section is obtained by roughly cutting and polishing the side surface on the lower side of the belt of the ring-shaped formed body having a rectangular cross section shown in FIG. Specifically, a rough cutting cutter blade is brought into contact with the inner periphery of a ring-shaped formed body having a rectangular cross section that is wound around a two-axis pulley and rotated, and then a rough grinding is performed. Then, finish polishing is performed.

Here, the rough cutting and polishing are performed while leaving both edges 21 forming the upper surface of the ring-shaped formed body having a rectangular cross section shown in FIG. 4 at a right angle. That is, in the vulcanized sleeve, the portion that becomes waste rubber is the portion indicated by black in FIG. 1B, and the volume thereof is equal to that of the conventional low edge belt shown in black in FIG. 1A. It is characterized by being small compared to that of waste rubber generated in the method.

Further, as is apparent from a comparison between FIGS. 1A and 1B, the number of low edge belts per vulcanization sleeve is increased to (W1 / W2) times the conventional example. Become.

In the low-edge belt shown in FIG. 1B, the entire surface of the side surface of the cushion rubber layer is left without being polished, but both edges constituting the outer peripheral surface of the belt are left at right angles. For example, a configuration in which a part of the cushion rubber layer is polished may be employed.

In the low-edge belt transmission system using the obtained low-edge belt, the cushion rubber layer does not fall into the V-groove pulley even if the compressed rubber layer of the low-edge belt wears over time. Belt failure due to peeling is avoided.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for producing a low-edge belt according to the present invention and a low-edge belt transmission system obtained by using the method will be described in more detail with reference to examples. Example 1 A polyester fiber of 1,100 denier was ply-twisted 2
1.0 times / 10cm, number of twists 11.4 times / 10cm,
An untreated cord having a total denier of 6,600 was prepared by twisting in the up-down direction in a twisting configuration of 2 × 3. After immersing the untreated cord in the isocyanate-based adhesive, about 170
After drying at ~ 180 ° C and further immersion in RFL solution,
Stretching heat setting treatment was performed at 00 to 240 ° C. to prepare a cord for treatment of a cord.

As the reinforcing cloth, para-aramid fibers and P
A plain woven canvas made of ET was used. After immersion in the RFL solution, heat treatment was performed at 150 ° C. for 2 minutes to obtain a treated canvas, and then a rubber composition containing CR as a main component was subjected to friction coating to obtain a canvas with rubber.

A rubber composition containing CR as a main component and containing aramid short fibers was prepared as a rubber sheet for forming a compressed rubber layer. Further, a rubber composition containing CR as a main component and not containing aramid short fibers was prepared as a rubber sheet for forming a lower cushion rubber layer and a rubber sheet for forming an upper cushion rubber layer.

A one-ply reinforcing cloth and a rubber sheet forming a compressed rubber layer are laminated, placed in a mold having concave portions and convex portions alternately arranged in a plane, and heated at 80 ° C. to form a cog shape. A molded cog pad was obtained.

Subsequently, the above-mentioned cog pad, a rubber sheet for forming a lower cushion rubber layer, a core wire, a rubber sheet for forming an upper cushion rubber layer, and a reinforcing cloth are formed in a cylindrical mold having a concave portion corresponding to a cog shape. Were successively wound, and then an outer matrix having a smooth inner peripheral surface was externally fitted. Thereafter, the jacket was covered, and the mold was placed in a vulcanizing can and vulcanized to obtain a vulcanized sleeve.

The vulcanized sleeve taken out is hung between two shafts and continuously cut at a width of 11.7 mm perpendicularly to the longitudinal direction of the sleeve while running at a predetermined speed. Was cut out.

Subsequently, the side surface of the compressed rubber layer is cushioned while the ring-shaped formed body having a rectangular cross section is wound around another two-axis polishing device, and a grinding wheel for finish polishing is brought into contact with both inner peripheral surfaces of the belt. Only the portion below the boundary between the rubber layer 5 and the compressed rubber layer was polished to obtain a low-edge cog belt having a V angle of 36 degrees and an upper width of 11.7 mm. The obtained low-edge belt was wound around an A-type V-groove pulley having a groove width of 11.7 mm, and was run for a predetermined time.

Comparative Example 1 A vulcanized sleeve similar to that of Example 1 was prepared,
A low edge belt with a top width of 13.6 to 13.7 mm is cut out and the entire side surface is finished and polished to obtain a top width of 13.3 mm.
And As in the case of the first embodiment, it was wrapped around an A-type pulley and allowed to run for a predetermined time.

In the method for producing a low-edge belt of Example 1, the amount of waste rubber generated was significantly reduced as compared with the method for producing a low-edge belt of Comparative Example 1. The number of strips from one vulcanization sleeve is (1
(3.7 / 11.7) times.

The low-edge belt obtained by the manufacturing method of Example 1 has a portion that does not catch on the V-groove pulley even if the side surface is worn after running for a predetermined test time. The core stripping that occurs when the low edge belt obtained by the manufacturing method is run does not occur.

[0035]

As described above, according to the first aspect of the present invention, a step of forming a vulcanization sleeve made of a member constituting a low-edge belt on a cylindrical mold, the vulcanization sleeve being perpendicular to the longitudinal direction. To cut out a ring-shaped molded body having a square cross section, and polishing both side surfaces of the ring-shaped molded body while leaving both edges forming an outer peripheral surface of the ring-shaped molded body at a right angle to form a V-shaped cross section. A method for producing a low-edge belt, comprising a step of forming, wherein the amount of waste rubber generated in the production of the low-edge belt is significantly suppressed. Further, the number of strips per vulcanized sleeve can be increased, which leads to an improvement in belt productivity.

According to a second aspect of the present invention, there is provided a step of forming a vulcanization sleeve comprising a member constituting a low-edge belt on a cylindrical mold, wherein the vulcanization sleeve is cut perpendicularly to a longitudinal direction to have a rectangular cross section. A method for producing a low-edge belt, comprising: a step of cutting out a ring-shaped molded body; and a step of forming only a section V by polishing only the compression layer on both side surfaces of the ring-shaped molded body, As in the first aspect of the present invention, generation of waste rubber in the production of a low edge belt is suppressed, and belt productivity is improved.

According to a third aspect of the present invention, there is provided a low-edge belt transmission system including a low-edge belt having a V-shaped cross section and a V-groove pulley comprising a compression layer and a cushion rubber layer, wherein both edges forming the upper surface of the low-edge belt have a right angle. And the width of the upper surface of the low-edge belt is not more than the groove width at the outermost periphery of the V-groove pulley, wherein the entire low-edge belt falls into the V-groove pulley. Also, belt failure due to premature core stripping in the low-edge belt transmission system is avoided.

According to a fourth aspect of the present invention, there is provided a low edge belt having a V-shaped cross section comprising a compression layer and a cushion rubber layer.
A low-edge belt transmission system comprising a groove pulley, wherein the V-groove pulley does not come into contact with the cushion rubber layer. Belt failure due to premature stripping of the core wire is avoided.

[Brief description of the drawings]

FIG. 1A is a partial side view of a vulcanization sleeve for cutting a low-edge belt in a conventional method for manufacturing a low-edge belt. (B) In the method for producing a low edge belt of the present invention,
It is a partial side view of the vulcanization sleeve which cuts out a low edge belt.

FIG. 2 is a cross-sectional view of a low edge belt used in the low edge belt transmission system of the present invention.

FIG. 3 is a sectional view of the low edge belt transmission system of the present invention.

FIG. 4 is a cross-sectional view of a ring-shaped formed body in the method for manufacturing a low edge belt according to the present invention.

FIG. 5 is a conceptual diagram of a step of cutting a low edge belt in a conventional method of manufacturing a low edge belt.

FIG. 6 is a sectional view of a conventional low edge belt.

FIG. 7 is a sectional view of a conventional low edge belt transmission system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low edge belt 2 Reinforcement cloth 3 Compression rubber layer 4 Core wire 5 Cushion rubber layer 6 Reinforcement cloth 10 Vulcanization sleeve 11 Cutter 31 V groove pulley

Claims (4)

[Claims] 1. A method for manufacturing a low-edge belt having a V-shaped cross section comprising a compression layer and a cushion rubber layer, comprising the steps of: forming a vulcanization sleeve comprising members constituting the low-edge belt on a cylindrical mold; A step of cutting out the ring-shaped molded body having a rectangular cross section by cutting the sulfurized sleeve perpendicularly to the longitudinal direction, and leaving both edges forming the outer peripheral surface of the ring-shaped molded body at a right angle to form both side surfaces of the ring-shaped molded body A method for manufacturing a low-edge belt, comprising a step of polishing to form a V-shaped cross section. 2. A method for manufacturing a low-edge belt having a V-shaped cross section comprising a compression layer and a cushion rubber layer, comprising: forming a vulcanization sleeve comprising members constituting the low-edge belt on a cylindrical mold; Cutting the sulfurized sleeve perpendicularly to the longitudinal direction to cut out a ring-shaped molded body having a rectangular cross section, and polishing only the compression layer on both side surfaces of the ring-shaped molded body to form a V-shaped cross section. A method for producing a low edge belt. 3. A low-edge belt transmission system including a low-edge belt having a V-shaped cross-section including a compression layer and a cushion rubber layer, and a V-groove pulley, wherein both edges forming a low-edge belt upper surface are at right angles, and the low-edge belt is provided. A low-edge belt transmission system, wherein the width of the upper surface is equal to or less than the groove width at the outermost periphery of the V-groove pulley. 4. A low-edge belt transmission system including a V-shaped low edge belt including a compression layer and a cushion rubber layer and a V-groove pulley, wherein the V-groove pulley does not contact the cushion rubber layer. Belt transmission system.