JPS59133034A - Manufacture of toothed belt - Google Patents

Abstract

PURPOSE:To improve the wear resistance of the side of a belt by a method wherein a expansible woven cloth lined with a gum arabic is cut to a specified length and both ends thereof are butted together by sewing or welding to form a tubular protective cloth. CONSTITUTION:A woven cloth lined with a gum arabic as material for a reinforced cloth layer 13 and protective cloth layers 14 and 14 of a toothed belt 11 is cut according to the shape of the toothed belt 11 to obtain a unit woven cloth 22. Selvages 22a and 22a thereof 22 butted together by a machine sewing or a welding so as to be long enough to be the circumferential length of a molding die 23. Then, it is cut to roughly the same length of the molding die 23 and both ends thereof are butted together by a machine sewing or the like to form a tubular woven cloth 24. The woven cloth 24 is applied for the molding die 23 with a flange 23a and after both side rims thereof reaches the molding die 23, a core cord 15 is wound thereon and then, an unvulcanized cover rubber sheet 26 thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a toothed belt having a protective cloth layer on the side surface of the belt.

In general, in a drive system using a toothed belt, under normal operating conditions, the toothed belt is applied to one of the left and right pulleys when the toothed belt force is wound around the pulley. Therefore, conventionally, core cords have been prepared to suppress the force by combining two types of strands: S-strand and Z-strand. The belt is deviated 10,000 degrees to the right.

Therefore, as shown in FIG.
A flange is provided on the flange, and a toothed belt 1 is attached to the flange.
However, with such a structure, the flange comes into contact with the belt side of the i-attached belt 1, which causes the belt side to wear out and damage the core. The cord may become frayed or frayed, and in some cases, worn rubber powder or core cord may become caught between the pulley and the toothed belt, preventing smooth engagement between the pulley and the toothed belt. This causes a problem in that the toothed belt rides on the teeth of the pulley, leading to sudden breakage.

Another problem is that the side surface of the flange on the pulley 2 and the side surface of the toothed belt 1 come into direct contact, which causes slipping noise.

The present invention was made by focusing on the fact that the above-mentioned problems can be solved by installing a protective cloth layer on the side surface of a toothed belt, and provides a toothed belt that can easily produce such a toothed belt. The purpose is to provide a manufacturing method for.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to embodiments with reference to the drawings.

In FIG. 2, reference numeral 11 denotes a toothed belt manufactured by the manufacturing method of the present invention, which includes a reinforcing cloth layer 16 on the outer periphery of the belt core 12 that covers the tooth surface of the belt, and a protective cloth layer 14 that covers the side surface of the belt.
, 14 are respectively installed. 15 is a core cord (tensile body).

Next, the manufacturing method of the present invention will be specifically explained.

Example/(FIGS. 3 and 2) First, as shown in FIG. 3, a rubber-starched woven fabric (for example, A woven fabric whose warp is X6 nylon yarn and whose weft is wool yarn is cut according to the shape of the toothed belt 11 to obtain a unit woven fabric 22. In addition, in FIG. 3, the length L is the sum of the belt width and twice the belt thickness of the toothed belt 11. In addition, when the height of the teeth of the toothed belt 11 is high, there is a risk that wrinkles will occur in the woven fabric having the above-mentioned structure. It is desirable to use a woolen woven fabric or stockinette knitted fabric.

The unit woven fabric 22 obtained in this way is
2a + 22a are connected by butt sewing or welding (see Figure 3) to a length sufficient for the circumference of the molding die 26 (total length of the toothed belt 11).

Thereafter, it is cut to approximately the same length as the molding die 26, and as shown in FIG. 5, both ends are butted and connected by sewing or welding to form a cylindrical woven fabric 24. Reference numeral 25 indicates a connection portion which is butt-sewn or lava-jointed.

Therefore, the cylindrical woven fabric 24 is applied to a mold 26 having a removable flange 23a (see Figure 2).
, its both side edges reach both sides of the molding die 26.

The core cord 15 is wound thereon, and the cover rubber sheet 26, which has not been added yet, is wound thereon, thereby completing the molding (see FIG. 7). This cover com sheet 2
An example of the composition of the rubber (black) constituting No. 6 is shown below.

Chloroprene rubber 100 parts by weight Magnesia j Stearic acid/carbon black j0 Anti-aging agent 2 AC polyethylene 4 Zinc oxide j Further, as the core cord 15, a cord made of glass, aromatic polyamide, steel, etc. is used.

Thereafter, as shown in FIG.
Vulcanize by heating and pressurizing according to step 3.

At this time, the woven fabric 24 is stretched by the softening of the cover comb sheet 26 by heating and the pressure, so that the belt tooth surface and the belt side surface are shaped, and at the same time, they are firmly adhesively fixed by vulcanization.

After the vulcanization is completed, the vulcanizing sleeve 27 is removed and cold set, and then the flange 23a is removed.
The back surface of the belt is buffed together with the molding die 26 and removed from the molding die 26, thereby obtaining the desired toothed belt 11.

The woven fabric 21, which will become the reinforcing fabric layer 16 and the protective fabric layer 14, is coated with rubber for abrasion resistance by sizing or calendar friction, and is then applied to the base fabric by sizing or calendar topping. If the belt is constructed by applying colored rubber (for example, white or blue) by calender topping via adhesive rubber, the belt life can be judged by the colored rubber being exposed due to wear of the base fabric. I can do it. An example of the composition of the colored rubber is shown below.

1) If the colored rubber is white, chloroprene rubber / θ0 weight ffi part magnesia j stearic acid / hydrous silicic acid, 2° titanium oxide
/θ naphthenic oil 10 accelerator
/ Zinc oxide 10 11) When the color rubber is blue 1) Add ultramarine (ulmarine 1 soo
.

This is a formulation consisting of Daiichi Kasei Kogyo (■) and sodium bicarbonate.

Example 2 (Fig. 2 to Fig. 77) First, as shown in Fig. 2 to Fig. 1/Fig. The unvulcanized cover rubber sheet 32 is rolled up and then cut into a width corresponding to the toothed belt 11i, as shown in Figure @72. As a result, the unvulcanized belt core 12
A portion 36 is formed.

On the other hand, a cylindrical woven fabric 24 of a predetermined width is obtained from a woven fabric treated with a rubber paste that is stretchable in longitudinal strength in the same manner as in Example (see Fig. 1).

This woven fabric 24 is applied to the portion 66 that will become the unvulcanized belt core 12 to form the belt material 64, and the molding is completed (see Figures 1.5 and 1).

As shown in FIG. 7, the belt material 64 is applied to the molding die 26, and the vulcanizing sleeve 27 (heat-resistant rubber) is
is attached, and then vulcanized in the same manner as in Example 1, and the desired toothed belt 11 is obtained through predetermined steps. In addition,
65 is space.

Subsequently, an experiment was conducted to compare the amount of wear and noise of the toothed belt obtained by the above manufacturing method with a conventional toothed belt that does not have a protective cloth on the side surface of the belt.

(Amount of wear) As shown in Fig. 1, a toothed belt 46 (G60H30θSZ specification) is wound around a pair of boots IJ41, 42, one pulley 41 is rotated at ) QPS, and the other pulley 4
2 is S, SOθrpm and P-200kg
After applying a certain load and driving under that condition for 760 hours,
The amount of wear on the side surface of the belt was measured.

At that time, misalignment θ was used as a parameter.

The results are shown in Table/.

Table / From these results, it can be seen that the type of the present invention has better wear resistance than the conventional type, and is advantageous in terms of belt life.

(Noise) Noise was measured using a Rion simple sound level meter at a point 7 m from the experimental system having the structure shown in Figure 1.

The results are in the table! Table 2 From these results, the A characteristic (J
ISC-/, 502) is considerably lower for the inventive type than for the conventional type, indicating that it is superior in quietness.

Note that the toothed belt 11 manufactured by the method of the above embodiment
As shown in FIG. 2, the reinforcing fabric layer 16 is formed of seven woven fabrics, or the belt tooth surface is required to have more wear resistance than the belt side surface. As shown in the figure, the reinforcing fabric layer 16 may be constructed by laminating two or more woven fabrics. In this case, for example, the inner woven fabric 13a is a stockinette woven fabric, and the outer woven fabric 131) is a woolen woven fabric.

In addition, it is possible to check in advance which side the toothed belt tends to deviate from, and to determine which side the toothed belt tends to deviate from. It is also possible to provide the protective cloth layer 14 only on the side surface of the belt on which the belt is placed.

With the above structure, according to the present invention, the protective cloth can be attached to the side surface of the toothed belt that contacts one flange of the pulley, so the wear resistance on the side surface of the belt is improved and the life of the belt is increased. As the belt width increases, it becomes possible to reduce the belt width, and in addition, it is possible to easily manufacture a toothed belt with excellent quietness.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a drive system for a toothed belt, and FIG. 2 is a perspective view of a toothed belt obtained by the manufacturing method of the present invention.
Figures 3 and 2 are explanatory diagrams of the manufacturing method of the embodiments, respectively, and Figure 77 is an illustration of the manufacturing method of each embodiment. FIG. 1 is an explanatory diagram of the manufacturing method, FIG. 1 is an explanatory diagram of the experimental system, and FIG.

Claims (2)

[Claims] (1) A method for manufacturing a toothed belt having a protective fabric layer on the side surface of the belt, in which a stretchable woven fabric coated with rubber glue is cut to a predetermined length, and both ends are butted and connected by sewing or welding. to form a cylindrical protective cloth, apply the protective cloth to a molding mold so as to reach the side of the mold, and wrap a tensile material and a rubber sheet thereon to form a belt material, A method for manufacturing a toothed belt, which comprises covering the outside with a vulcanizing sleeve and then vulcanizing it in a vulcanizer. (2) A method for manufacturing a toothed belt having a protective cloth layer on the side surface of the belt, which comprises wrapping a tensile material and a rubber sheet around a molded mantle and cutting the belt core into a predetermined width. A protective cloth, which is a stretchable woven fabric coated with rubber paste, is applied to the bottom side of the body and the sides of the paralysis to form a belt material, and the belt material is applied to a mold to form the outside.
A method for producing a toothed belt, comprising: covering the belt with a curing sleeve, and then curing it with a trowel in a vulcanizer.