JPS5852100B2 - V-belt and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a V-belt, in particular, a rubberized canvas in the compression part.
A low edge type V consisting of a plurality of laminated canvas layers and a rubber layer in which short fiber groups are oriented and embedded in the horizontal direction, and both sides of the canvas are bent and exposed in the circumferential direction of the side surface of the belt.
The belt and its manufacturing method are related to belts and their manufacturing methods.Compared to conventional low edge V belts in which short fibers and canvas layers are embedded in compressed rubber, the belts have a higher noise prevention effect and improved abrasion resistance on the side surfaces of the belt. The purpose of this method is to significantly reduce scrap compared to other manufacturing methods, resulting in significant cost reductions.

Conventionally, low edge type V-belts in which canvas layers and transverse short fibers are oriented in compressed rubber are disclosed in U.S. Patent Nos. 3 and 4.
No. 16,383, U.S. Pat. No. 3,478,613
It is publicly known from the specification etc.

However, among these, the former has a structure in which multiple layers of canvas are embedded in the compressed part in a direction directly transverse to the longitudinal direction of the belt, making it possible to reduce noise and vibration compared to those without canvas layers. However, due to its orientation, the exposed area of the canvas is small, and as the load during use increases, the noise increases.
On the other hand, the latter has multiple layers of wide-angle canvas embedded straight in the lateral direction within the compressed rubber, so the belt has high rigidity in the lateral direction, good lateral pressure resistance, and Since it is an angled canvas, it has good flexibility, but as in the case of the former, the exposed area of the canvas is extremely small, leaving problems such as noise, and there is room for improvement, including measures to prevent noise. .

On the other hand, the mass production method for such belts usually consists of one to several layers of rubberized canvas on the outer circumferential surface of a cylindrical drum, an unvulcanized compressed rubber sheet with short fibers oriented laterally, and an unvulcanized adhesive rubber sheet. , a rope tension body, and an unvulcanized upper adhesive rubber sheet are sequentially laminated and adhered to form a cylindrical wide unvulcanized belt molded body, and after vulcanization, the belt molded body is cut at a predetermined angle in the drum circumferential direction. However, this method generates scrap with a triangular cross section between the cut belts, which cannot be recycled because it is made of vulcanized rubber. However, as mentioned above, the resulting belt has canvas and short fibers oriented and buried right sideways, so the exposed area of the fiber layer to the side of the belt is small, and there is a problem of noise generation. be.

In view of the above-mentioned problems, the present invention was achieved as a result of repeating various horizontal divisions in order to solve the problems.First of all, the characteristics of the present invention are as follows: The second purpose is to bend and expose the fiber layer in the circumferential direction of the side surface of the belt, thereby increasing the exposed area of the fiber layer on the side surface of the belt. It is an object of the present invention to provide a manufacturing method that can be manufactured with significantly less scrap compared to the conventional method.

Hereinafter, specific embodiments of the present invention will be sequentially described with reference to the accompanying drawings.

FIG. 1 is a partial perspective view of a belt according to the first feature of the present invention, and in the figure, 2 and 3 are NR (natural rubber), 5DR (
The upper and lower adhesive rubber layers are made of a single material such as (styrene-butadiene rubber), CR (chloroprene rubber), or BR (butadiene rubber), or an appropriate blend of these materials, and the tensile parts made of various adhesive rubbers Ht2t3 are made of polyester, Nylon, Kevlar (product name, aromatic polyamide),
Alternatively, low elongation and high strength rope tensile members 1 such as glass fibers are buried in parallel, and a compression portion 4 is interlayered below the tension portion.

The compressed part 4 is made of a rubber layer in which short fiber groups 6 are oriented and buried in the transverse direction, and is the most characteristic part of the belt according to the present invention. Plain weave canvas with rubber made of cotton yarn or a blend of cotton yarn and various synthetic fibers, or made of cotton yarn or a blend of cotton yarn and various synthetic fibers with a crossing angle of 95 to 150 degrees.
Canvas 5 made of wide-angle canvas with rubber woven at a wide angle of
are oriented and buried, and each side portion thereof is bent and exposed by a certain height H along the circumferential longitudinal direction of the side surface of the belt.

The exposed height H of the side surface of the canvas 5 is usually 1.5 mm of the thickness of the canvas 5.
2 to 5.0 times, and the greater the exposed height of the canvas 5, the more effective it is for noise prevention, but due to manufacturing constraints, it is 1.2 to 5.
．． It is set to 0 times.

In this way, by bending and exposing the canvas 5 on the side of the belt and increasing the exposed area of the fiber layer on the side of the belt, it is possible to prevent noise during driving of the belt, and it is suitable for use in automobiles and agricultural machinery. It is suitable for belts for general industry, washing machines, and office machines.

On the other hand, (2) The upper surface of the belt is usually exposed as shown in FIG. 1, but one or more layers of rubberized bias canvas made of cotton yarn or rubberized nylon stretchable canvas can also be attached to both sides.

Next, the method for manufacturing the belt of the present invention as described above will be described.

This method is particularly characterized in that it is cut during unvulcanization and forms an unvulcanized belt having a different dimension from the mold groove, and the process is illustrated and explained in FIG. 2 and subsequent figures.

That is, in the first step of the manufacturing method of the present invention, a thin rubber layer 4' is formed on the outer peripheral surface of a cylindrical drum D as shown in FIG.
Canvas 5 consisting of a plain-woven canvas made of cotton yarn or a blended yarn of cotton yarn and various synthetic fibers in both warp and warp, or a bias canvas made of cotton yarn or a blended yarn of cotton yarn and various synthetic fibers in both warp and warp, woven at a wide intersection angle of 95 to 1500 Multiple layers of rubberized canvas, usually 2 to 4 ply, are wrapped endlessly.

Although this winding is not shown, it is usually done on drum D.
A cylindrical rubber sleeve is inserted onto the surface of the sleeve and wrapped around it.

Next, a rubber made of the same material as the rubber layer 4', that is, N
A compressed rubber sheet 4 of a constant thickness in which various short fiber groups 6 are oriented and embedded in the transverse direction is wrapped around a single material such as R, SBR, CR, or BR or a rubber made of an appropriate blend of these materials, and then the compressed rubber sheet 4 is A thin unvulcanized lower adhesive rubber sheet 3 made of the same material as 4' is wrapped around it, and the tensile rope 1 is further wound on top of this, but this wrapping affects the alignment of the tensile rope. Therefore, the surface of the laminate of compressed rubber 4 and adhesive rubber 3 must be smooth, and in particular, the thickness of the laminate sheet must be uniform throughout.

Polyester fiber, nylon, Kevlar, or glass whose surface is subsequently treated with isocyanate yarn length U''RFL (resorcinol formalin latex) liquid and subjected to hot stretching treatment is placed on the adhesive rubber sheet 3 that has been wrapped above. A low-elongation, high-strength tensile rope 1, such as a fiber, is wound spirally under a constant tension, and on top of that is an unvulcanized upper adhesive rubber sheet 2 of a constant thickness, and a rubberized bias canvas made of cotton thread. Alternatively, one or more layers of rubberized nylon stretchable canvas 7 are attached and formed into a wide unvulcanized belt molded body having a thickness thinner than the depth of the mold M shown in FIG. The process is completed.

After the forming process is completed, the process moves to the second cutting process, which is an important process in the manufacturing method of the present invention, in which cutting is performed at a top width and angle different from the normal cutting mode.

That is, the cutter C is used to sequentially cut into a V-shape with a top width that is 0~2 degrees wider than the top width of the mold groove, a bottom width that is wider than the bottom width of the mold, and an angle that is 0~20 degrees narrower than the inclination angle of the mold groove. As shown in FIG. 3, which will be described later, it has a top surface width wider than the upper width of the mold groove, and a bottom surface width wider than the bottom surface width of the mold, and as described above, the thickness of the wide unvulcanized belt molded body is smaller than the width of the mold groove. thinner than the depth, i.e.
A plurality of flat trapezoidal unvulcanized V-belts formed at a low height are obtained.

At this time, ring-shaped scrap Sr with a triangular cross section is generated. Conventionally, this scrap Sr was cut after vulcanization, so it could not be recycled and was mostly discarded. However, in the method of the present invention, unvulcanized scrap Sr is generated. Since the scrap Sr is cut in stages, it is possible to easily separate the constituent rubber 4゜4' from the canvas 5. Therefore, the rubber 4, 4' in the scrap Sr separated from the canvas 5 can be easily separated. can be mixed with other unvulcanized rubber and used again.

This can significantly reduce manufacturing costs (material costs).

Next, the relationship between the cross-sectional dimensions of the unvulcanized belt shown in FIG. 3 obtained by cutting as described above and the groove-shaped cross-sectional dimensions of the mold M shown in FIG. 4 is as follows.

W'-(W-1-(o~2)) 0~20°θ'-〇-()=θ-(O~10°) S'=(1,0~1.3)S However, W: Mold groove upper width θ: Mold groove inclination angle S: Mold groove cross-sectional area W': Unvulcanized ■ Belt upper width θ': Unvulcanized ■ Belt inclination angle S': Unvulcanized ■ Belt cross-sectional area Like this Unvulcanized■ The cross-sectional dimensions of the belt and the groove-like cross-sectional dimensions of the mold M were significantly changed by bending both sides of the rubberized canvas 5 in the compressed rubber 4, 4' in the subsequent vulcanization process. Comparing the dimensions of the two sideways, firstly, if W is less than (W+O), that is, less than W, the upper width of the vulcanized belt is insufficient, and (W-)-2) urn
In the above case, the upper width of the vulcanized belt is too wide, causing cracks (rubber protrusion) on both sides of the upper surface of the belt, which is unfavorable in terms of quality. Therefore, the order of W'-(W+(0 to 2)) as described above is preferable. It is.

Regarding the inclination angle, when θ is less than (θ - 0'), it is easy to fit the unvulcanized belt to the mold groove, but the unvulcanized belt is pushed against the side of the mold groove during vulcanization. No pressure is applied, making it impossible to bend and expose the canvas buried in the compressed rubber, and if θ' exceeds (θ-100), θ' becomes too narrow and the bottom width of the unvulcanized belt becomes wide. , mold M
Since it becomes difficult to fit into the groove, θ' = θ-(0 to 100)
is suitable.

In this case, the actual cutting angle is twice the inclination angle θI, that is, 2θ', since the cutting is in an isosceles triangle shape as shown in Figure 2, so the cutting angle should be 2θ' = 2θ - (0 to 20°). become.

Furthermore, regarding the cross-sectional area of both, if S' is less than 1.0 times that of S, the vulcanized belt will lack volume (lack of weight), causing belt vibration, and if it is more than 1.3 times, the volume will be over. Not only does this result in a substandard product, but there is also the problem of producing a large amount of paris as described above.
-, (i, o~1.3)S.

The unvulcanized belt obtained by sequentially cutting it with the cutter C according to the above-mentioned dimensional standards is separated from the drum D, and after being fitted into the mold groove, it is transferred to the next third vulcanization step.

Figures 5 to 7 are diagrams showing the vulcanization mode in the manufacturing method of the present invention. Figure 5 is a partial cross-sectional view showing the unvulcanized belt fitting mode, and Figure 6 is the mode during vulcanization. FIG. 7 is a partial cross-sectional view showing the state of completion of vulcanization.

In Figure 5, the unvulcanized belt is cut wider than the top width of the groove of the ring mold or press mold M and narrower than the inclination angle of the groove, so it completely fits into the groove G of the mold M as shown in the figure. The maul bolt is not aligned and is partially lifted up.
(2) A gap is formed at the bottom of the groove G and the groove G is fitted.

In this state, next, as shown in Fig. 6, a cylindrical rubber sleeve is inserted into the outer peripheral surface of the unvulcanized belt or a flat plate press P is placed on the outer surface of the unvulcanized belt, and high pressure steam is sent to the outer surface of the sleeve or the flat plate press P. , unvulcanized■belt is pressurized and heated.

At this time, the unvulcanized belt floatingly fitted into the groove G of the mold M is flat as shown in Fig. 5, and the canvas cloth with rubber embedded in the compressed rubber 4, 4' 5
, the oriented short fibers 6 are buried and oriented in the horizontal direction, but as pressurization and heating by high-pressure steam progresses through the rubber sleeve or flat plate press P, the mold M becomes The compressed rubber layers 4, 4' of the unvulcanized belt inserted into the groove G are in a fluid state and are pressed and filled in the direction of the arrow in FIG. , as well as the short fiber group 6 gradually take on a wavy shape due to the pressing force of the steam and the stress on the sides of the groove G of the mold M, and furthermore, as a pressing force is applied in the direction of the arrow, both sides of the buried canvas 5 as shown in FIG. 7 are formed. A vulcanized belt is formed with the parts resting on the sides and being bent and exposed.

In addition, at this time, the short fiber group 6 also comes to exhibit a wavy shape.

Next, by removing the rubber sleeve or flat plate press P after vulcanization and further removing the vulcanized belt from the mold M, the belt of the present invention as shown in FIG. In other words, a low edge type belt in which both sides of the canvas 5 embedded in the compressed rubber are curved and exposed in the circumferential direction of the side surface of the belt to a height of about 1.2 to 5.0 times the thickness of the canvas. obtain.

As described above, the present invention provides a belt in which both sides of one or more layers of rubberized canvas embedded in a compressed part are bent and exposed to increase the exposed area of the fiber layer on both sides, and a method for manufacturing the same. This has the following remarkable effects.

That is, first of all, in the belt (1) obtained by the method of the present invention, the exposed area of the fiber layer on the side surface of the belt is larger than that of conventional belts of this type due to the bending and exposure of the canvas, and the slippage between the belt and the pulleys is good. In addition, the belt can be easily pulled out, significantly reducing noise during driving, and improving the abrasion resistance of the side surfaces of the belt, increasing its applicability to various fields and making it an ideal manufacturing method. It is simple and because it is cut in an unvulcanized state at the time of manufacturing, the scrap rubber generated by this cutting can be recycled, reducing material costs compared to conventional manufacturing methods, reducing manufacturing costs by approximately 30 to 40 yen. %, and is an extremely useful method not only in terms of production efficiency but also economically.

[Brief explanation of drawings]

Fig. 1 is a partial perspective view of the belt according to the present invention, and Fig. 2 is a partial cross-sectional view showing the form of the belt according to the present invention.
Figure 3 is a cross-sectional view of an unvulcanized belt obtained by the manufacturing method of the present invention, Figure 4 is a partial cross-sectional view of the mold used in the manufacturing method of the present invention, and Figures 5 to 7 are the manufacturing method of the present invention. FIG. 1... Rope tensile body, 2... Upper adhesive rubber layer, 3... Lower adhesive rubber layer, 4...
・Compressed part, 5... Canvas, 6... Short fiber group, 7... Top canvas, D... Cylindrical drum, M... ...Mold, C...Cutter, G...Mold groove, Sr...
・Scrap, P...Press.

Claims (1)

[Scope of Claims] 1. A low edge type V-belt body consisting of a compression part, a tension part, and a winding of a longitudinal rope tensile body, in which the compression part is laminated with one or more layers of rubberized canvas. The shape is formed by laminating a canvas layer and a rubber layer in which short fiber groups are oriented and buried in the horizontal direction, and both sides of the canvas layer are bent and exposed to a required height in the circumferential direction of the side surface of the belt. Characterized by a large canvas exposed area■
belt. 2. The V-belt according to claim 1, wherein the embedded canvas in the compressed portion is a plain weave canvas made of cotton yarn or a blended yarn of cotton yarn and synthetic fiber in both warp and warp. 3. The V-belt according to claim 1, wherein the embedded canvas in the compressed portion is a wide-angle canvas made of cotton yarn or a blended yarn of cotton yarn and synthetic fiber in both warp and warp. 4. The V-belt according to claim 1, wherein the bending height of both sides of the buried canvas in the compressed portion is 1.2 to 5.0 times the thickness of the canvas. 5 One or more layers of canvas with combs are laminated on the outer circumferential surface of a cylindrical drum, an unvulcanized compressed rubber sheet with short fibers oriented in the transverse direction, an unvulcanized lower adhesive rubber sheet, a rope tension body, an unvulcanized A first step of forming a cylindrical wide unvulcanized belt with a thickness thinner than the depth of the mold by sequentially laminating one or more layers of a vulcanized upper adhesive rubber sheet and further one or more layers of rubberized canvas; The upper width of the belt l1ff shape is O~ than the upper width of the mold groove.
2. The bottom width is wider than the mold bottom width, and the V
The shape cutting angle is O~20 from the inclination angle of the ring mold groove.
' It has a narrow angle, is cut into a V shape with a cross-sectional area of 1.0 to 1.3 times the cross-sectional area of the mold groove, and has a bottom width wider than the bottom width of the mold groove. A second step of obtaining a plurality of unvulcanized V-belts having a height lower than the groove depth, and fitting the obtained unvulcanized V-belts into a mold with grooves of a predetermined size, and vulcanizing them by applying pressure and heating. A method for producing a V-belt, comprising a third step.