JPS58217337A - Manufacture of v-belt with cog - Google Patents

Abstract

PURPOSE:To obtain the titled belt, in which the row of a short fiber mixed rubber layer is not disordered, by cutting one surface of said rubber blank, forming an undulatory section corresponding to a cog shape and winding the blank on the undulatory section forming die together with each belt constitutional member while conforming the undulatory shapes of both the blank and the die and molding the blank. CONSTITUTION:A short fiber mixed rubber sheet in which short fibers are oriented in the longitudinal direction (the row direction) is wound on a cylinder 9, the cylindrical short fiber mixed rubber blank 10, the row direction thereof agrees in the circumferential direction, is formed, the cylinder 9 is turned, and grooves (undulatory shapes) 12 are cut in circumferential shapes at every one cog pitch by a V-edge 11 with a shape agreeing with the cog shape of the V-belt. The blank is cut along a cutting-plane line C of the width direction (the orthogonal direction to the cog), and removed from the cylinder 9. On the other hand, bottom sail cloth 8 is disposed conformed to the undulatory section 13a corresponding to the cog shape of the die 13, said rubber blank 10 is wound on the cloth while the undulatory section 12 of the blank and the undulatory section 13a of the die are conformed, and a tensile body 2 and an adhesive rubber layer 4 are wound and the whole is vulcanized. The blank is extracted from the die 13, and cut to a V-belt shape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cogged V-belt having cogs on the bottom surface.

An example of a cogged V-belt formed by the manufacturing method of the present invention is shown in FIG. This V-belt 1 is a so-called belt with a low edge cog, and has a tension body 2, an extension part 1a at the upper part of the tension body 2, and a compression part 1b at the lower part. is formed. The tensile body 2 has cords made of synthetic fibers such as polyester, nylon, rayon, and Kevlar, or cords such as glass cords and steel cords arranged in the longitudinal direction of the belt, and the tensile body 2 is bonded. It is buried in the rubber layer 4. Further, on the upper surface of the adhesive rubber layer 4, a rubberized canvas 6 made of CR rubber or the like is laminated on a bias.
A short fiber mixed rubber layer 7 constituting b is provided. The short fiber mixed rubber layer 7 is made of cR rubber W' (as r-heath, short fibers of cotton, nylon/polyester, rayon, Kepler, etc. They are mixed in such a way that they are oriented and form grains.Furthermore, on the surface (bottom surface) of the cog S, a reinforcing bottom canvas 8 is stretched along the uneven shape of the cog 6. .

Further, a short fiber mixed rubber layer similar to the short fiber mixed rubber layer 7 of the pressure section m 1b may be laminated on the adhesive rubber layer 4, and the rubberized canvas 6 may be laminated thereon.

Conventionally, there are press-fitting methods, molding methods, cutting methods, and the like as methods for manufacturing the above-mentioned cogged V-belts.

Therefore, when constructing the rubber layer containing short fibers in the compression part of a V-belt having cogs, the cogs can be formed without disturbing the arrangement of the short fibers along the belt width direction, and the belt width can be adjusted to meet the required lateral pressure resistance. In order to make full use of the characteristics of the rubber layer mixed with rectangular fibers, it improves the rigidity in the direction while maintaining the flexibility in the longitudinal direction of the belt, which requires flexibility, and changes the rigidity ratio in the width direction and longitudinal direction of the belt. There is a need to provide a tensile material for tensile strength, to eliminate positional changes in the tensile material during molding and vulcanization, to eliminate restrictions on the materials used as the tensile material, and to improve performance stability.

Regarding the above point, the conventionally adopted press-fitting method is to press-fit a mold having an arbitrary cog shape on the outer surface into the belt component during belt vulcanization.
In addition, the molding method involves molding the cog material in advance into a shape close to the cog shape, and using this molded cog material to manufacture the V-belt with the cog. In the former press-fitting method, when the cog part is press-fitted, the rubber material flows and the orientation of the short fibers changes, causing disorder of grain in the short fiber-containing rubber layer, and at the same time, the integrally molded tensile body is forced into the cog. Due to this, the position changes during molding and after vulcanization, resulting in lack of stability.
In particular, if the tensile material does not have elasticity, there is a problem in that its performance is significantly degraded. On the other hand, in the latter molding method, although the change in the position of the tensile member is reduced, the flow of the rubber material during molding causes the problem of disordering the matrix of the short fiber-containing rubber layer, similar to the press-fitting method.

On the other hand, the cutting method uses V-bell after vulcanization)? For example, cut it into a cog shape with a V blade etc. and create a V-pell with a cog. This cutting method eliminates the disorder of grain in the short fiber-containing rubber layer that occurs in the press-fitting method and molding method, but
In addition to making it impossible to stretch the reinforcing material for the cog part of the bottom canvas, there are restrictions on the puffer shape that can be formed by cutting or grinding, and furthermore, because cutting is performed in the width direction of the belt after forming it endlessly. , productivity is poor and processing costs increase.

In view of this, the present invention aims to provide a method for manufacturing a V-belt with cogs, which does not cause disorder in the grain of the short fiber-containing rubber layer and allows for the tensioning of reinforcing members such as bottom canvas. It is something.

That is, in the present invention, one side of the short fiber-containing rubber material constituting the compression section of the V-belt is sequentially cut in a direction substantially parallel to the grain direction to form unevenness corresponding to a cog shape, and then the cog is formed on the outer periphery. A cog that is formed by wrapping the cut rubber material together with each belt component in a mold having an uneven shape corresponding to the shape, matching the uneven shapes of both, and vulcanizing the material and cutting it into a V-belt shape. This is a method for manufacturing a V-belt.

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

<Example/> In the manufacturing method of this example, the first step is to apply a known adhesive treatment to a rubber compound based on chloroprene rubber,
Nylon short fibers cut to a length of a2 mm/! ;P
After HR is mixed and uniformly dispersed, it is formed into a sheet using a calender to obtain a rubber sheet (thickness θ0 g) containing short fibers in which the short fibers are oriented in the longitudinal direction (grain direction).

In the second step, the rubber sheet is wrapped in two plies, for example, around the cylinder 9 with a smooth outer surface, keeping the width of the sheet, to prevent air from entering. A material 10 is formed. (See Figure 2) In the third step, the cylinder 9 is rotated, and the V blade 11 (skive blade) has a shape that almost matches the cog shape of the V belt.
From the - side to the other side / groove 1 in a circular pattern for each cog pitch
2 is cut to sequentially form unevenness corresponding to the cog shape.

(See Figure 1) In the qth step, the rubber material 10k that has been cut is cut along the cutting line C in the width direction (direction perpendicular to the cog), removed from the cylinder 9, and then cut into a sheet-like rubber material 1.
Get 0. The grain direction A of this rubber material 10 is the groove 1.
2, and the width direction B in the state of being wound around the cylinder 9 is the length direction of the product V-<7p.

In the fifth step, after cutting the sheet-like rubber material 10f1 to a predetermined width along a cutting line parallel to the cut line C of L1, the mold 154 is cut.
and wrap it around. (See Fig. 3) This mold 15i11 has irregularities corresponding to a cog shape on the outer periphery, the protrusion 1'5a is formed to extend parallel to the axial direction, and the outer diameter corresponds to the belt length. It is.

The belt component members (the reference numerals in FIG. 1 are used) are sequentially wound around the mold 16. First, the bottom canvas 8 is arranged to match the unevenness 15a of the mold 15, and then , the above rubber material 10 (short fiber mixed rubber layer 7) 'fr
The unevenness 12 and the unevenness 15a of the mold 15 are wrapped together, and the ends are butted together. On this rubber material 10, an adhesive rubber sheet 4'lt comprising an adhesive rubber layer 4'lt made of a chloroprene rubber compound is wound, and then a tensile member 2 (/, 4.nn diameter) which has been subjected to known adhesive treatment and heat treatment is placed in a predetermined manner. Wind in a spiral with tension (JK9) and pitch (/, 7.rFn). After wrapping the entire adhesive rubber sheet constituting the adhesive rubber layer 4 on the tensile member 2, and wrapping a short fiber-containing rubber sheet as necessary, a chloroprene rubber compound was placed on both sides and the rubber was cut into bias shapes. Two pieces of cotton canvas 17 constituting the canvas 6 are wrapped around each other, and the forming process is completely completed.

In the sixth step, a cylindrical vulcanized rubber sheet is mounted as a sleeve on the laminated structure obtained in the fifth step, and the vulcanized fJ
3 and undergo vulcanization treatment at a predetermined pressure and temperature. Through this vulcanization process, the belt components are bonded to each other, and the shape of the cog 5 is molded into a shape that perfectly matches the uneven shape of the mold 1'5.

In the seventh step, the vulcanization can and the υ mold 1!1 are removed, the pressure sleeve on the outer periphery is removed from the mold 16, and the vulcanized product is heated to a predetermined temperature (approximately 300C or less) by air cooling or water cooling. The molded product is then pulled out from the mold 16.

In the g-th step, the vulcanized molded product is cut into a predetermined V-belt shape with a belt width and angle to obtain a V-belt 1 with cogs.

In addition, in the actual practice 19, the rubber element (A10) is formed so that its grain direction A is parallel to the circumferential direction, and when the mold 15 is installed, it is Although it is designed to be reversed, it is also possible to form the grain direction of the rubber blank 10 parallel to the width direction of the cylinder 9 and cut it.In that case, when installing it in the mold 16, just reverse the front and back sides. Although it is not necessary to reverse the width direction and the circumferential direction, the cutting speed becomes slower and there are restrictions due to the relationship between the outer diameter of the cylinder 9 and the belt length.

<Example 2> In this example, as shown in FIG. 9, rubber material 1 was used in the previous example.
0, a calendered rubber sheet mixed with short fibers is wrapped around the outer periphery of the cylinder 9, but in this example, the calendered rubber sheet mixed with short fibers is used. After forming a rubber material 10' of a predetermined thickness by overlapping and pressing K in sheet form (flat plate 'l1), a shape almost matching the cog shape of the V-belt is formed in parallel to the grain direction of the short fibers. V with
A linear groove 12 is cut by the blade 11 from the negative side to the other side/for each cog pinch, and unevenness corresponding to the cog shape is sequentially formed.

The rubber material 10' formed as described above is
The V-belt is formed by the same steps as the following steps.

In summary, the present invention involves cutting a cog rubber material made of short fiber-mixed rubber material in an unvulcanized state into irregularities corresponding to the shape of a cog, and using this cog rubber material to form an endless V-belt with cogs. The cogged V-belt manufactured by the method described above has no disorder in the grains of the short fiber-containing rubber material and has excellent lateral pressure resistance. In addition, it is preferable that the grain direction of the short fibers in the short fiber-containing rubber layer be provided in the width direction of the belt in order to improve the lateral pressure resistance, but due to manufacturing errors etc., the grain direction may be There are cases where it does not completely match the width direction.

That is, when the elastic modulus of the cog portion rubber material of the cog-equipped V-belt manufactured by the method of the above embodiment is measured with a dynamic viscoelasticity measuring device, the elastic modulus in the grain direction is /3.2. d
It is the value of yr1/c1n2, and if the conventional press-fitting method is determined in the same way, its elastic modulus W, 0.2d
The material according to the present invention has a large elastic modulus and improves the side pressure resistance of the compressed portion 1b.

In addition, when compared to belts made by the conventional press-fitting method, the belt bendability of the belt according to the present invention is slightly softer, and the load-slip characteristics are improved by 7~/s%, and the durability is improved by approximately 2θ coefficient in terms of running time. However, the belt heat generation at that time was also low, and good results were obtained in terms of overall performance.

Therefore, according to the present invention as described above, since the cog is formed on the short fiber-containing rubber material by cutting it when it is not yet vulcanized, the short fibers are not disturbed in their grain structure, and the effect of short fibers being incorporated is sufficient. The difference in rigidity between the belt width direction and the longitudinal direction can be created well.

Moreover, since the cutting of the above-mentioned cog was done when it was not cured,
Even if the cog shape is not formed to perfectly match the product cog shape during cutting, it can be molded to perfectly match the cog uneven shape of the mold during vulcanization, so the cog shape is not restricted as with conventional cutting methods. Therefore, the cutting efficiency can be improved. It is possible to completely cover the bottom of the twisted cog with a reinforcing material such as bottom canvas, which improves durability.

On the other hand, there is almost no change in the position of the tensile material between molding and vulcanization, resulting in stable performance. It has various excellent advantages such as being able to use glass etc.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view showing an example of a V-belt with cogs manufactured according to the present invention, FIGS. 2 and 3 show examples of the present invention, and FIG. 3 is a short fiber-containing rubber. FIG. 3 is a cross-sectional front view of the main part showing the cutting process of the material, FIG. 3 is a front cross-sectional view of the main part showing the molding process, and FIG. be.

Claims (1)

[Claims] (1) One side of the short fiber-containing rubber material that makes up the compressed part of the belt is sequentially cut in a direction approximately parallel to the grain direction of the short fibers to form unevenness corresponding to a cog shape, and then The rubber material after cutting is wrapped around each belt component, matching the uneven shapes of both, into a mold with unevenness corresponding to the shape of a cog.This is then vulcanized and formed into a belt shape. A method for manufacturing a V-belt with cogs, which comprises cutting.