JP2003130138A - Toothed belt and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothed belt which can improve resistance against tooth chipping by markedly enhancing heat resistance and wear resistance on the surface of a tooth part. SOLUTION: In the toothed belt which is formed by being provided with a rear part 14 to which the core wire 7 is embedded along in the longitudinal direction of the belt and a plurality of the tooth parts 2 which are provided at the rear part 14 along in the longitudinal direction of the belt at prescribed intervals, a wire netting 4 made of a metallic fiber attached over an area from the surface of the tooth parts 2 to the surface of a tooth bottom part 3 between the tooth parts 2. Since the area from the surface of the tooth parts 2 to the surface of the tooth bottom part 3 can be covered with the wire netting 4 made of the metal fiber having high heat resistance and wear resistance, even if excessive load is applied to the tooth parts 2, strength of the tooth parts 2 can be held by the wire netting 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed belt used as a transmission belt and a method for manufacturing the toothed belt.

[0002]

2. Description of the Related Art FIG. 10 shows an example of a toothed belt A. An annular toothed belt A has a plurality of teeth provided on the inner surface of the toothed belt A at a predetermined constant interval along the longitudinal direction of the belt. It comprises a portion 2 and a back portion 14 in which the cord 7 is embedded along the longitudinal direction of the belt. And tooth 2
A tooth cloth 20 is adhered along the surface of the tooth root 2 and the surface of the tooth bottom portion 3 between the adjacent tooth portions 2. As the tooth cloth 20, conventionally, canvas cloth is generally used.

Here, the problems relating to the durability of the toothed belt A are roughly classified into belt cutting due to fatigue of the core wire 7 and tooth loss of the tooth portion 2 due to overload and wear of the tooth cloth 20. Regarding belt cutting due to fatigue of the core wire 7, use of an aramid core wire or a small-diameter core wire of high-strength glass, use of a rubber compound having excellent heat resistance, and constant belt tension both at startup and during running. Improvements have been made such as by using an auto tensioner that keeps the

On the other hand, with respect to the problem of wear of the tooth cloth 20 which is one of the causes of the tooth chipping of the tooth portion 2, on the other hand, a woven fabric made of a fiber having excellent heat resistance such as an aromatic polyamide fiber for the purpose of improving heat resistance or The knitted fabric is used as the tooth cloth 20 or the tooth cloth 2
The coefficient of friction can be reduced by applying a matrix layer containing a fluororesin on the surface of No. 0, or the friction coefficient can be similarly reduced by impregnating the tooth cloth 20 with a rubber mixture containing a fluororesin. (See Japanese Laid-Open Patent Publication No. 151190), various ideas have been conventionally made.

[0005]

However, it cannot be said that heat resistant fibers such as aromatic polyamide fibers have sufficient abrasion resistance, and even when a fluororesin is used, a sufficient amount of the fluororesin is applied to the tooth cloth. It was difficult to impregnate 20 with the fluororesin and to expose the fluororesin on the surface of the tooth cloth 20, and it was difficult to provide the tooth cloth 20 with sufficient abrasion resistance. Therefore, considering the usage environment of the toothed belt A in which the load on the tooth portion 2 is becoming further excessive, it is said that the conventional method of using the organic fiber-based tooth cloth 20 has reached the limit of the tooth-breaking resistance. The current situation.

The present invention has been made in view of the above points, and the heat resistance and wear resistance of the tooth surface are remarkably enhanced,
It is an object to provide a toothed belt that can improve resistance to chipping of teeth, and an object of the present invention is to provide a method for manufacturing a toothed belt that can easily manufacture such a toothed belt. To do.

[0007]

A toothed belt according to claim 1 of the present invention has a back portion 14 in which a core wire 7 is embedded along the belt longitudinal direction, and a predetermined interval in the back portion 14 along the belt longitudinal direction. In a toothed belt formed by including a plurality of tooth portions 2 provided in step 1, a wire mesh 4 made of metal fibers is attached from the surface of the tooth portion 2 to the surface of the tooth bottom portion 3 between the tooth portions 2. It is characterized by consisting of.

The invention of claim 2 is characterized in that, in claim 1, the metal fiber is made of stainless steel.

The invention of claim 3 is the same as in claim 1 or 2, wherein the metal fiber has a fiber diameter of 0.1 mm to 0.3 mm.
It is characterized by being.

In the method for manufacturing a toothed belt according to a fourth aspect of the present invention, a metal fiber is formed by forming a tooth mold having a tooth portion 2 and a tooth bottom portion 3 between the tooth portions 2 on the surface of the rubber sheet 1. The metal mesh 4 produced in step 3 and processed into an irregular shape corresponding to the tooth portion 2 and the tooth bottom portion 3 is attached to the rubber sheet 1 from the surface of the tooth portion 2 to the surface of the tooth bottom portion 3, and then this rubber sheet 1 is used as a tooth mold. The toothed portion 2 and the tooth bottom portion 3 are formed on the outer circumference with the surface with the mark
After covering the outer circumference of the vulcanization mold 6 provided with the vulcanization tooth mold 5 corresponding to the above, the core wire 7 is wound around the outer circumference of the rubber sheet 1, and the back rubber sheet 8 is wound on the outer side thereof. It is characterized by performing sulfurization.

According to the invention of claim 5, in claim 4, after the reinforcing film 9 is stretched on the back surface of the rubber sheet 1,
It is characterized in that the surface of the rubber sheet 1 is pressed to form a tooth mold including a tooth portion 2 and a tooth bottom portion 3 between the tooth portions 2.

The invention of claim 6 is the same as in claim 4 or 5, wherein the wire mesh 4 is superposed on the toothed surface of the rubber sheet 1, and the pressing tooth mold 10 corresponding to the tooth portion 2 and the tooth bottom portion 3 is provided. By pressing the wire netting 4 on the toothed surface of the rubber sheet 1 with the pressing die 11 provided, the tooth portion 2 of the rubber sheet 1
The wire mesh 4 is attached to the surface of the tooth bottom portion 3 from the surface thereof.

The invention of claim 7 is the method according to any one of claims 4 to 6, wherein rubber is rolled to produce a long rubber sheet 1, and a long rubber sheet 1 is provided on the back side of the long rubber sheet 1. While advancing in the longitudinal direction while attaching the reinforcing film 9,
The rubber sheet 1 is passed between the tooth mold forming roll 12 and the flat roll 13, and a tooth mold having a tooth portion 2 and a tooth bottom portion 3 between the tooth portions 2 is formed on the surface of the rubber sheet 1 by the tooth mold forming roll 12. , A metal mesh 4 made of metal fibers is pressed to form the metal mesh 4 into an uneven shape corresponding to the tooth portion 2 and the tooth bottom portion 3 of the rubber sheet 1, and then the rubber sheet 1 is fed in the longitudinal direction. While the wire mesh 4 is superposed on the surface of the rubber sheet 1, the rubber sheet 1 on which the wire net 4 is superposed is further fed, and the pressing die 11 is provided with the pressing tooth die 10 corresponding to the tooth portion 2 and the tooth bottom portion 3. Rubber sheet 1 by applying pressure
The wire mesh 4 is attached from the surface of the tooth portion 2 to the surface of the tooth bottom portion 3.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

The present invention is characterized in that the wire mesh 4 is used as a tooth cloth attached to the surface of the tooth portion 2 and the surface of the tooth bottom portion 3 in the toothed belt A. The metal net 4 is made of metal fibers, and the material of the metal fibers is stainless steel, nickel, monel, brass, brass, phosphor bronze, copper, iron, steel, aluminum,
Titanium, nichrome, hastelloy, inconel and the like are not particularly limited, but among these, stainless is preferable.

The type of stainless steel is not particularly limited, and is austenitic SUS201, SUS20.
2, SUS301, SUS301L, SUS301J
1, SUS302, SUS303, SUS304, SU
S304L, SUS304Ni, SUS304N2, S
US304LN, SUS304J1, SUS304J
2, SUS304J3, SUS305, SUS305J
1, SUS309J, SUS310S, SUS316,
SUS316L, SUS316N, SUS316LN,
SUS316Ti, SUS316J1, SUS316J
1L, SUS317, SUS317L, SUS317L
N, SUS317J1, SUS317J2, SUS31
7J3L, SUS317J4L, SUS317J5L,
SUS321, SUS347, SUS384, austenite-ferrite SUS329J1, SUS32
9J3L, SUS329J4L, ferrite SUS
405, SUS410L, SUS429, SUS43
0, SUS430F, SUS430LX, SUS430
J1L, SUS434, SUS436L, SUS436
J1L, SUS444, SUS447J1, Martensite SUS403, SUS410, SUS410
S, SUS410F2, SUS410J1, SUS41
6, SUS420J1, SUS420J2, SUS42
0F, SUS431, etc. can be mentioned.

The thickness (fiber diameter) of the metal fiber is 0.1.
The range of mm-0.3 mm is preferable. If the fiber diameter of the metal fiber is less than 0.1 mm, the strength of the wire netting 4 cannot be sufficiently obtained, and the reinforcing effect of protecting the tooth portion 1 of the toothed belt A from a tooth loss may be insufficient. . On the contrary, if the fiber diameter of the metal fiber exceeds 0.3 mm, the thickness of the wire net 4 becomes thick, and it may be difficult to form the tooth shape corresponding to the tooth portion 2 and the tooth bottom portion 3 of the toothed belt A. There is. The openings of the wire mesh 4 are preferably mesh numbers (#) defined by the fiber diameter of the metal fiber per inch of width and the size of the openings, and the wire mesh 4 of # 40 to # 100 is preferable. The woven structure of the wire net 4 made of the metal fibers is not particularly limited, and includes plain weave, twill weave, plain tatami weave,
Twill weave, twill weave, satin weave, reverse tatami weave, stretch weave and the like.

Next, the production of the toothed belt A using the wire net A as a tooth cloth will be described. FIG. 2 shows the first half of the manufacturing process of the toothed belt A. First, by rolling the raw rubber composition with rolling rolls 28 such as a calender roll, the rubber sheet 1 is made into a continuous long product. Mold. Here, as the raw material rubber of the rubber composition, starting with hydrogenated nitrile rubber (HNBR),
Rubbers having improved heat aging resistance such as chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM), and chloroprene rubber (CR) are preferable. The hydrogenation ratio of HNBR is preferably 80% or more, and more preferably 90% or more in order to exhibit heat resistance and ozone resistance. HNBR having a hydrogenation rate of less than 80% has extremely low heat resistance and ozone resistance. Further, carbon black, zinc white, stearic acid, a plasticizer, an antioxidant and the like can be contained as a compounding agent, and sulfur or an organic peroxide can be contained as a vulcanizing agent. There is no particular limitation on the method of mixing the components, but a Banbury mixer,
It can be carried out by kneading with a kneader or the like. Table 1 shows an example of the rubber composition.

[0019]

[Table 1]

Next, the reinforcing film 9 is attached to the back surface of the rubber sheet 1 while continuously feeding the long rubber sheet 1 roll-formed as described above in the longitudinal direction by the conveyor 29 or the like. The reinforcing film 9 is a tooth mold forming roll 1 described later.
There is no particular limitation as long as the shrinkage is small with respect to the heating temperature of about 100 ° C. by 2 or the flat roll 13 and the adhesiveness with rubber is excellent, and for example, a polyethylene terephthalate film can be used, and from a canvas The liner may be The reinforcing film 9 is formed in a long length, and can be attached to the back surface of the rubber sheet 1 by unwinding it from a roll and passing it through the laminating roll 30 while sending it at the same speed as the rubber sheet 1. It is possible.

Next, the reinforcing film 9 is formed on the back side in this way.
While continuously feeding the stretched rubber sheet 1 in the longitudinal direction, a molding is performed in which a tooth mold is attached to the surface side of the rubber sheet 1. The molding with the tooth mold is performed using the tooth mold forming roll 12 and the flat roll 13 which are arranged with their outer peripheral surfaces facing each other with a predetermined clearance. The tooth form forming roll 12 is formed by forming a plurality of tooth forming recesses 31 parallel to the axial direction on the outer periphery at regular intervals over the entire periphery, and the flat roll 13 has a smooth outer peripheral surface. It is formed as a surface. These tooth mold forming rolls 12
The flat roll 13 is heated to about 100 ° C.

Then, the back surface of the rubber sheet 1 having the reinforcing film 9 stretched along the outer periphery of the flat roll 13 is passed between the tooth mold forming roll 12 and the flat roll 13, and the rubber is formed by the tooth mold forming roll 12. By pressing the surface of the sheet 1, the rubber of the rubber sheet 1 is pushed into the tooth part forming concave portion 31 of the tooth mold forming roll 12 as shown in FIG. With the rubber thus pushed into the tooth part forming recess 31, a large number of tooth parts 2 can be formed at regular intervals on the surface of the rubber sheet 1 as ridges in a direction perpendicular to the longitudinal direction. It is possible to perform molding in which a tooth mold including a tooth bottom portion 3 between the tooth portion 2 and the tooth portion 2 is attached to the surface of the rubber sheet 1. The rubber sheet 1 in which a tooth mold including the tooth portion 2 and the tooth bottom portion 3 is molded is supplied onto the conveyor 33 with the toothed surface facing upward.

Here, in order to reduce the PLD value of the toothed belt A (the distance between the pitch line serving as the center line of the core wire 7 and the tooth bottom portion 3) when a tooth mold is attached to the surface of the rubber sheet 1. For this reason, it is desirable that the tooth bottom portion 3 formed on the surface of the rubber sheet 1 is thinly formed to a thickness close to zero. However, if the tooth bottom portion 3 is made thin as described above, the strength of the rubber sheet 1 becomes weaker. It cannot be sent to the process. For this reason, the reinforcing film 9 is provided on the back surface of the rubber sheet 1.
The rubber sheet 1 is reinforced by the reinforcing film 9 and is supported by the reinforcing film 9, and the rubber sheet 1 having a tooth pattern can be conveyed to the next step by the reinforcing film 9.

On the other hand, the wire netting 4 is previously provided with the rubber sheet 1 described above.
The tooth portion 2 and the tooth bottom portion 3 formed in the above are formed in an uneven shape corresponding to the tooth mold. In the embodiment of FIG. 2, the wire mesh 4
Is formed into a long length, and is rolled out from a roll,
The wire mesh 4 is formed into an uneven shape by passing the rubber sheet 1 between the pair of uneven forming rolls 22 and 23 while being fed at the same speed. That is, as shown in FIG. 4, projections 24 and 25, which are parallel to the axial direction, are provided on the outer peripheries of the concavo-convex forming rolls 22 and 23 at regular intervals over the entire circumference, and the projections 24 and 25 are mutually Can be freely engaged with. Then, by passing the wire net 4 between the concavo-convex forming rolls 22 and 23, the convex portion 24 of one concavo-convex forming roll 22 can form the recess 26 corresponding to the tooth portion 2, and the other concavo-convex forming roll 23. The convex portion 25 can form the convex portion 27 corresponding to the tooth bottom portion 3, and the metallic net 4 can be formed into an uneven shape in which the concave portions 26 and the convex portions 27 are alternately formed.

The wire netting 4 thus formed in an uneven shape
While being continuously fed in the longitudinal direction, the conveyor 33
Overlaid on the toothed surface of the rubber sheet 1 fed over. At this time, since the metal mesh 4 has the concave portions 26 corresponding to the tooth portions 2 and the convex portions 27 corresponding to the tooth bottom portions 3 alternately formed, the concave portions 26 in the tooth portions 2 of the rubber sheet 1 and the tooth bottom portions of the rubber sheet 1 are formed. The protrusions 27 are respectively fitted to the teeth 3 so that the wire netting 4 can be closely overlapped with the toothed surface of the rubber sheet 1 along the surface of the tooth portion 2 along the surface of the tooth bottom portion 3.

A pressing die 11 is arranged above the transfer conveyor 33. The pressing die 11 is formed by providing the pressing tooth mold 10 corresponding to the tooth portion 2 and the tooth bottom portion 3 formed on the surface of the rubber sheet 1 on the lower surface. That is, the pressurizing tooth mold 10 includes the pressurizing recess 35 and the tooth bottom part 3 corresponding to the tooth part 2.
Are formed from the pressurizing protrusions 36 corresponding to. After the metal mesh 4 is stretched on the toothed surface of the rubber sheet 1 as described above, the pressure recess 35 is formed in the tooth portion 2 of the rubber sheet 1.
However, the pressurizing projection 36 is fitted to the tooth bottom portion 3 so that 1
By pressing with a pressurizing mold 11 heated to about 00 ° C. and pressing the wire netting 4 on the surface of the rubber sheet 1, the structure shown in FIG.
As shown in FIG. 5, the wire recess 4 can be pressed against the surface of the tooth portion 2 by the pressure recess 35 so that the wire mesh 4 can be brought into close contact with the surface of the tooth 2.
The metal mesh 4 can be pressed against the surface of the tooth bottom part 3 to be brought into close contact therewith, and the tooth cloth 4 can be attached from the surface of the tooth part 2 of the rubber sheet 1 to the surface of the tooth bottom part 3.

In the embodiment shown in FIG. 2, the long wire net 4 is continuously formed on the rubber sheet 1 while being formed into the uneven shape by the uneven forming rolls 22 and 23.
It is also possible to supply the wire mesh 4 formed in a concavo-convex shape so as to be placed on the rubber sheet 1 in a fixed size. In this case, the concavo-convex shape of the wire net 4 is formed by the concavo-convex forming rolls 22 and 2 as described above.
Instead of using No. 3, it can be performed by pressing with a flat mold, for example.

As described above, a tooth mold can be attached to the surface of the rubber sheet 1 and the wire netting 4 can be attached thereto. At this stage, the rubber sheet 1 is only heated to about 100.degree. , Unvulcanized. Then, the rubber sheet 1 is cut at a predetermined number of teeth. It is preferable that the rubber sheet 1 is cut in the belt width direction along the center of the tooth portion 2 as shown in FIG. 6, and both ends of the cut rubber sheet 1 are a half tooth portion 2a obtained by cutting the tooth portion 2 in half. Has become.

Next, vulcanization is performed using the vulcanization mold 6.
The vulcanization mold 6 is formed in a cylindrical shape, and a vulcanization tooth mold 5 corresponding to the tooth portion 2 and the tooth bottom portion 3 is provided on the outer periphery of the vulcanization mold 6. The vulcanization tooth mold 5 has a tooth fitting recess 3 parallel to the axial direction of the vulcanization mold 6 on the outer periphery of the vulcanization mold 6.
7 and the tooth bottom portion fitting projections 38 are formed by alternately providing the tooth portions 2 and the tooth bottom portions 3 of the rubber sheet 1 at the same pitch in the circumferential direction. Then, the rubber sheet 1 cut as shown in FIG. 6 is wound around the outer periphery of the vulcanization die 6 as shown in FIG. 7A with the toothed surface facing inside. At this time, as shown in FIG. 7B, the tooth portion 2 is inserted into the tooth portion fitting recess 37,
The rubber sheet 1 is wound around the outer periphery of the vulcanization mold 6 such that the tooth bottom portions 3 are fitted into the tooth bottom portion fitting protrusions 38, and the half tooth portions 2a at both ends of the rubber sheet 1 are
2a are fitted in the same tooth fitting recess 37,
The cut end faces of both ends of the rubber sheet 1 are in close contact with each other.

As described above, the rubber sheet 1 is vulcanized by the mold 6
After the rubber sheet 1 is covered on the outer periphery of the rubber sheet 1, the reinforcing film 9 is peeled off from the rubber sheet 1, and the core wire 7 is spirally wound around the outer periphery of the rubber sheet 1 as shown in FIG. As the core wire 8, for example, a cord made of multifilaments in which filament raw yarns of glass fiber are bundled can be used. After this, an unvulcanized back rubber sheet 8 forming a back portion 14 is further formed on the core wire 7 as shown in FIG.
Wrap it like. The back rubber sheet 8 may be made of a rubber different from the rubber sheet 1 for forming the tooth portion 2, but it is preferable to use the same rubber.

Then, after covering with a jacket and vulcanizing at 150 ° C. for about 30 minutes, the tooth portion 2 of the unvulcanized rubber sheet 1 becomes vulcanizing teeth of the vulcanizing mold 6. Type 5
It is vulcanized and molded in the tooth-fitting recess 37. At the same time, the back rubber sheet 8 is vulcanized to form the back portion 14, the core wire 7 is embedded in the back portion 14, and the tooth portion 2 and the back portion 14 are integrated. Also, during this vulcanization,
The cut end surfaces of the half tooth portions 2a, 2a at both ends of the rubber sheet 1 are joined to be integrated into a tubular shape, and the tooth portion 2 is molded from the pair of half tooth portions 2a, 2a. Both ends of the wire net 4 are also abutted and connected at the center of the top of the tooth portion 2 when the tooth portion 2 is molded. Here, the rubber forming the tooth portion 2 and the rubber forming the tooth bottom portion 3 are vulcanized in a mesh of the wire net 4, and the wire net 4 is physically fixed to the rubber. Further, the metal net 4 is chemically bonded through a reaction layer formed between the surface of the plated wire net 4 and the rubber, and the wire net 4 is firmly bonded from the surface of the tooth portion 2 to the surface of the tooth bottom portion 3. It is fixed.

A tubular product can be obtained by vulcanization molding as described above, and the tubular product is cooled and back-polished, and then cut into a predetermined width to give a ring-shaped product as shown in FIG. The toothed belt A having the structure as shown can be obtained. In the toothed belt A thus obtained, the metal net 4 covered from the surface of the tooth part 2 to the surface of the tooth bottom part 2 is made of metal fiber, and is a conventional tooth made of organic fiber. Heat resistance compared to cloth,
Extremely high wear resistance and strength. Therefore, even if an excessive load is applied to the tooth portion 2, the strength of the tooth portion 2 can be maintained by the metal net 4, and the resistance to chipping of teeth can be significantly improved. Further, the wire netting 4 has flexibility due to the deformation of the wire netting structure, and does not undergo plastic deformation with respect to the deformation of the tooth portion 2.

[0033]

EXAMPLES Next, the present invention will be specifically described by way of examples.

(Example 1) SUS having a fiber diameter of 0.14 mm
# 60 wire mesh 4 made of 304 plain weave of metal fibers
As the rubber sheet 1 and the back rubber sheet 8, a rubber sheet obtained by rolling the rubber compound of Table 1 using HNBR as a raw material rubber to a thickness of 1.5 mm is used, and the core wire 7
As a result, a toothed belt having a tooth mold S8M and a number of teeth of 105 as shown in FIG. 1 was produced by using glass fiber as described above.

(Example 2) SUS having a fiber diameter of 0.14 mm
# 80 wire mesh 4 made of 304 plain-woven metal fibers
A toothed belt as shown in FIG. 1 was obtained in the same manner as in Example 1 except that was used.

Comparative Example 1 66 nylon (1
40d) single thread, weft thread 66 nylon (140
d) A twill weave is used as the tooth cloth 20 using three twisted yarns and one spandex (110d), and the same material as in Example 1 is used thereafter, and the same standard as in Example 1 is used.
A toothed belt as shown in FIG. 10 was produced.

(Comparative Example 2) 6 nylon (21
0d) single thread, m-aramid (20d) 2 as weft
1 and a spandex (140d) twisted yarn, twill weave canvas is used as the tooth cloth 20, and thereafter the same material as in Example 1 is used, and the same standard as in Example 1 is used.
A toothed belt like 0 was produced.

In order to evaluate the tooth chipping property of the toothed belts manufactured in Examples 1 and 2 and Comparative Examples 1 and 2, the toothed belts are provided on three axes having a drive pulley of 21 teeth and a driven pulley of 42 teeth. A test in which the drive pulley was rotated at 7200 rpm in an atmosphere of 120 ° C under an initial load of 15 kgf (147N) was performed for 300 hours, and the state of the root of the tooth was observed. Further, the belt strength of the toothed belt and the shearing force of the tooth portion were also measured. The results are shown in Table 2.

[0039]

[Table 2]

As can be seen from Table 2, Examples 1 and 2 show superior belt strength and tooth shearing force to Comparative Examples 1 and 2, and there is no problem in the state of the tooth root. It was a thing. It is considered that this is because the metal mesh on the tooth surface provided high heat resistance and wear resistance. In the comparative example using the organic fiber tooth cloth, even in the comparative example 2 using the aramid fiber having relatively high heat resistance and abrasion resistance, the tooth cloth at the root portion is considerably worn, and the belt strength and the tooth shearing are increased. Inferior in power.
In particular, in Comparative Example 1 using nylon fiber, tooth chips were generated, but this is because the melting point of the nylon fiber constituting the tooth cloth is 260 ° C. It is considered that the tooth chipping occurred early due to.

[0041]

As described above, the toothed belt according to the first aspect of the present invention is provided with a back portion in which a core wire is embedded along the belt longitudinal direction and a plurality of back portions at predetermined intervals along the belt longitudinal direction. In the toothed belt formed by including the tooth portions that are formed, the metal mesh made of metal fibers is provided by being attached from the surface of the tooth portions to the surface of the tooth bottom portion between the tooth portions. From the surface to the surface of the tooth bottom, it can be covered with a metal mesh made of metal fiber with high heat resistance and abrasion resistance, and even if an excessive load acts on the tooth part, the strength of the tooth part can be maintained with the wire mesh. It is possible to improve the resistance to tooth chipping.

According to the second aspect of the invention, since the metal fiber of the wire mesh is made of stainless steel, the heat resistance and the wear resistance are remarkably high, and the effect of improving the tooth chipping resistance can be enhanced. .

According to the third aspect of the invention, since the metal fiber of the wire mesh has a fiber diameter of 0.1 mm to 0.3 mm, it is easy to form an uneven shape corresponding to the tooth portion and the tooth bottom while maintaining the strength of the wire mesh. It can be molded into.

In the method for producing a toothed belt according to a fourth aspect of the present invention, a toothed die having a tooth bottom portion and a tooth bottom portion between the tooth portions is formed on the surface of the rubber sheet, and the toothed belt is made of metal fibers. Attach the wire mesh processed in the uneven shape corresponding to the tooth part and the tooth bottom part to the rubber sheet from the surface of the tooth part to the surface of the tooth bottom part, then put this rubber sheet on the outer surface with the toothed surface inside After covering the outer circumference of the vulcanization mold with the vulcanization tooth molds corresponding to the teeth and the tooth bottom, wrap the core wire around the outer circumference of this rubber sheet, and wrap the back rubber sheet on the outside, Since it is designed to be vulcanized, it is possible to vulcanize the wire mesh that has been previously formed in the concave-convex shape corresponding to the tooth part and the tooth bottom part from the surface of the tooth part to the surface of the tooth bottom part, and vulcanize Wire mesh made of poor metal fiber is used on the surface of teeth and teeth. The toothed belt affixed to the surface of the part in which can be easily manufactured.

According to a fifth aspect of the present invention, after the reinforcing film is stretched on the back surface of the rubber sheet, the surface of the rubber sheet is pressed to form a tooth mold comprising tooth portions and a tooth bottom portion between the tooth portions. Therefore, even if the thickness of the tooth bottom is thinly formed,
The rubber sheet can be reinforced with the reinforcing film, and the conveyance of the rubber sheet or the like is not hindered.

According to a sixth aspect of the present invention, a wire mesh is laminated on the toothed surface of the rubber sheet, and the wire mesh is made of a rubber sheet with a pressing die provided with a pressing tooth die corresponding to the tooth portion and the tooth bottom. By pressing the toothed surface, the wire mesh is attached from the tooth surface of the rubber sheet to the surface of the tooth bottom, so the wire mesh is closely attached to the surface of the tooth portion and the tooth bottom of the rubber sheet. The wire mesh can be attached to the toothed belt and can be prevented from peeling off from the toothed belt.

According to a seventh aspect of the present invention, rubber is rolled to produce a long rubber sheet, and a long reinforcing film is attached to the back side of the long rubber sheet while the long sheet is fed in the longitudinal direction. This rubber sheet is passed between the mold forming roll and the flat roll to form a tooth mold on the surface of the rubber sheet with a tooth mold forming roll and a tooth bottom portion between the tooth parts, and on the other hand,
By pressing a wire mesh made of metal fibers to form a wire mesh in an uneven shape corresponding to the tooth portion and the tooth bottom of the rubber sheet,
Next, while feeding the above-mentioned rubber sheet in the longitudinal direction, a wire mesh is laid on the surface of the rubber sheet, and the rubber sheet on which the wire mesh is laid is further fed to provide a pressing tooth mold corresponding to the tooth portion and the tooth bottom portion. By pressing with a mold, a wire mesh was attached from the surface of the tooth part of the rubber sheet to the surface of the tooth bottom, so that the production of the rubber sheet, the molding of the tooth mold to the rubber sheet, the wire mesh of the rubber sheet Each sticking operation can be performed with high productivity in a continuous process while feeding the rubber sheet in the longitudinal direction.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an example of an embodiment of a toothed belt according to the present invention.

FIG. 2 is a schematic front view showing a part of the steps in the embodiment of the method for manufacturing the toothed belt of the present invention.

FIG. 3 is an enlarged cross-sectional view of a part of the above process.

FIG. 4 is an enlarged cross-sectional view of a part of the above process.

FIG. 5 is a cross-sectional view enlarging a part of the above process.

FIG. 6 is an enlarged perspective view of a part of the above process.

7A and 7B are views showing a part of the same process, in which FIG. 7A is a perspective view and FIG. 7B is an enlarged sectional view of part.

FIG. 8 is an enlarged perspective view of a part of the above process.

FIG. 9 is an enlarged perspective view of a part of the above process.

FIG. 10 is a perspective view of a part of a conventional example.

[Explanation of symbols]

1 rubber sheet 2 teeth 3 tooth bottom 4 wire mesh 5 Vulcanizing tooth mold 6 Vulcanizing mold 7 cores 8 Back rubber sheet 9 Reinforcement film 10 Pressing die 11 Pressing mold 12 Tooth mold forming roll 13 flat roll 14 back

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Muneo Tsukamoto             4-1-2, Hamazoe-dori, Nagata-ku, Kobe-shi, Hyogo               Mitsuboshi Belting Co., Ltd. (72) Inventor Takayuki Tagawa             4-1-2, Hamazoe-dori, Nagata-ku, Kobe-shi, Hyogo               Mitsuboshi Belting Co., Ltd. F term (reference) 4F213 AA45 AB24 AD03 AD16 AD18                       AG03 AG17 WA04 WA15 WA41                       WA53 WA87 WB01 WC03

Claims (7)

[Claims] 1. A toothed belt formed by comprising a back portion in which a cord is embedded along the belt longitudinal direction and a plurality of tooth portions provided on the back portion at predetermined intervals along the belt longitudinal direction. A toothed belt, comprising: a wire mesh made of metal fibers, which is attached from the surface of the tooth portion to the surface of the tooth bottom portion between the tooth portions. 2. The toothed belt according to claim 1, wherein the metal fiber is made of stainless steel. 3. The fiber diameter of the metal fiber is from 0.1 mm to 0.
It is 3 mm, The toothed belt of Claim 1 or 2 characterized by the above-mentioned. 4. A rubber sheet is molded by attaching a tooth mold composed of a tooth portion and a tooth bottom portion between the tooth portions to each other, and is made of metal fibers and processed into an uneven shape corresponding to the tooth portion and the tooth bottom portion. Attach the wire mesh to the rubber sheet from the surface of the tooth part to the surface of the tooth bottom part, and then, with the surface with the tooth mold attached to this rubber sheet inside, a vulcanizing tooth mold corresponding to the tooth part and the tooth bottom part on the outer circumference. A method for producing a toothed belt, comprising: covering a provided vulcanization mold, winding a core wire around the outer periphery of the rubber sheet, winding a back rubber sheet around the core wire, and then performing vulcanization. 5. The method of forming a reinforcing sheet on the back surface of a rubber sheet, and then pressurizing the surface of the rubber sheet to form a tooth mold having a tooth bottom portion and a tooth bottom portion between the tooth portions. 4. The method for manufacturing a toothed belt according to item 4. 6. A surface of a rubber sheet on which a tooth pattern of a rubber sheet is attached by a pressing die having a toothed surface of a rubber sheet and a pressing tooth die corresponding to a tooth portion and a tooth bottom. The wire mesh is attached from the surface of the tooth portion of the rubber sheet to the surface of the tooth bottom portion by applying pressure to the wire sheet.
Or the method for manufacturing a toothed belt according to item 5. 7. A rubber sheet is manufactured by rolling a rubber into a long length, and a long reinforcing film is attached to the back side of the long rubber sheet and fed in the longitudinal direction, and at the same time, a tooth mold forming roll and a flat roll are formed. This rubber sheet is passed between the two to form a tooth mold on the surface of the rubber sheet with a tooth mold forming roll, which consists of the tooth part and the tooth bottom part between the tooth parts.On the other hand, the wire mesh made of metal fibers is pressed to form a rubber. Form a wire mesh in a concavo-convex shape corresponding to the tooth portion and the tooth bottom of the sheet, then stack the wire mesh on the surface of the rubber sheet while feeding the above rubber sheet in the longitudinal direction, and further send the rubber sheet on which this wire mesh is stacked. The wire mesh is attached from the surface of the tooth portion of the rubber sheet to the surface of the tooth bottom by applying pressure with a pressing die provided with a pressing tooth die corresponding to the tooth portion and the tooth bottom portion. 4 to 6 The method for manufacturing a toothed belt according to any one of claims.