JP2000346138A - Toothed belt, timing belt pulley for toothed belt, toothed belt transmission, toothed belt manufacturing device, and manufacture of toothed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothed belt, a timing belt pulley and a transmission device for its toothed belt capable of obtaining an enough performance endured to a high load even when the width of the belt is narrow, excellent in durability, and capable of extremely decreasing a noise when driving, and easily and cheaply manufacture the toothed belt. SOLUTION: This belt is provided with a main body formed of thermoplastic elastormer having tensile strength of 15 MPa or more, elongation of 250% or more, and rubber hardness of 80 deg. to 95 deg., and core wires buried in the main body and having tensile elastic modules of 25,000 MPa or more, and tensile strength of 800 MPa or more. Belt teeth 11, 12 inclined mutually in the reverse direction from a nearly central part of the belt width direction toward both ends of a belt width are formed at predetermined pitch intervals. The teeth are connected to each other at a nearly central position in the belt width direction, and are formed so as to shift in the belt longitudinal direction at positions of both ends part in the belt width direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an application in which high load transmission is required and a low noise is strongly required, such as an application for carrying or positioning by reciprocating motion of a belt span portion, for example, a door opening / closing portion of an automatic door. , Used in linear transport equipment, etc., or for endless and synchronous transmission applications, such as toothed belts used in drive units of electric injection molding machines and machine tools, or drive units of medical equipment, etc. The present invention relates to a toothed pulley for a synchronous belt, a synchronous belt transmission, a synchronous belt manufacturing apparatus, and a synchronous belt manufacturing method.

[0002]

2. Description of the Related Art Conventionally, since a toothed belt with straight teeth generates a large amount of noise when driven, for example, there is a problem when opening and closing an automatic door and an elevator door of a condominium at night or when working in a factory. there were.

In order to reduce the above noise,
For example, the teeth of the belt form an oblique angle that is counterbalanced in the opposite direction from the center in the width direction to both ends, and the center lines of adjacent teeth are staggered by a distance of 10 to 90% of the pitch. A toothed belt is known (for example, see Japanese Utility Model Laid-Open No. 5-96589).

[0004]

However, in the above-mentioned conventional toothed belt, the center lines of the right and left teeth are staggered from each other. There is an inconvenience that chipping durability is low. This inconvenience becomes significant particularly when the belt width is narrow and the inclination angle of the teeth is large.

[0005] Further, in the above conventional toothed belt,
For example, in order to suppress the deformation of teeth with a narrow belt, extremely high physical properties are required as the properties of the estramer, and as a result, there is also a disadvantage that it becomes expensive.

Further, in the case of manufacturing the above-mentioned conventional toothed belt, since the teeth are inclined in the opposite direction,
For example, in a case where the belt is manufactured by a method of manufacturing a thermosetting urethane toothed belt, the mold cannot be removed even if two dies are taken on one surface of the mold. For this reason, there is a disadvantage that one die is taken on one side and the production efficiency is reduced. In addition, even in the case where one piece is taken on one side of the mold, it is necessary to split the mold vertically and twist the mold left and right to remove the mold, which increases the number of steps. There are inconveniences. As a result, if many belts are to be manufactured, there are disadvantages that the number of mold surfaces must be enormous and the number of steps must be extremely increased.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a toothed belt capable of extremely reducing noise during driving. To provide a toothed belt with sufficient performance to withstand high loads even when the width is narrow, and to provide a toothed belt with excellent durability, and to provide a toothed pulley and a transmission for the toothed belt. Another object of the present invention is to manufacture the toothed belt easily and inexpensively.

[0008]

In order to achieve the above object, the present inventor pays attention to the structure of a toothed belt, that is, the shape and material thereof, and combines them to reduce noise. To complete the invention of a toothed belt capable of withstanding a high load, a pulley for the toothed belt, and a transmission, and focusing on the point of continuously manufacturing the toothed belt, The invention of the belt manufacturing apparatus and the manufacturing method has been completed.

[0009] The first invention relates to a toothed belt, and more specifically, has a tensile strength of 1 according to the first aspect.
5MPa or more, elongation 250% or more, and rubber hardness 80 °
A main body formed of a thermoplastic elastomer of about 95 °, and a tensile modulus of elasticity of 25,000 MPa embedded in the main body.
And a core wire having a tensile strength of 800 MPa or more,
It is a specific matter that teeth inclined in a direction opposite to each other in a belt longitudinal direction from a substantially center in a belt width direction to both ends thereof are formed at a predetermined pitch interval in the belt longitudinal direction.

First, the physical properties of the thermoplastic elastomer and the core wire according to the first invention will be described.

That is, for example, an elastic body having a tensile strength (T _B ) of less than 15 MPa cannot withstand a large tooth load and is liable to tooth loss. For this reason,
The thermoplastic elastomer preferably has a T _B of 15 MPa or more, whereby a toothed belt capable of sufficiently withstanding a large tooth load is formed.

[0012] For example, if the elastic body has an elongation (E _B ) of less than 250%, when the normal bending is performed with a pulley having a small number of teeth, the reverse bending is performed with a rear idler, or when the radius of curvature is small,
The elastic body cannot withstand the strain and cracks easily occur. Therefore, the thermoplastic elastomer, by the E _B and more than 250%, toothed belts even large distortion is avoided the occurrence of cracks is formed.

The rubber hardness is measured by a JIS A-type spring hardness tester (JIS K6301).
However, for example, if the rubber hardness is less than 80 °, the deformation of the teeth becomes too large with respect to a large tooth load, and at the time of a high load or in the use of a narrow belt, tooth skipping ( Pulling over from the teeth of the pulley). On the other hand, in the case of an elastic body having a rubber hardness of less than 80 °, when the tire is continuously driven for a long time under a large tooth load, abrasion of the pressure surface of the tooth is likely to occur, resulting in a short life. On the other hand, if the rubber hardness exceeds 95 °, the belt bending stiffness becomes large. For example, when the belt is run at high speed with a small pulley, deterioration is promoted by self-heating due to bending, and cracks are caused by running for a long time. It is easy to occur. Therefore, the rubber hardness of the thermoplastic elastomer is preferably from 80 ° to 95 °, so that all of the above-described problems can be avoided, and high durability can be achieved even under a high load and a large load. A maintained toothed belt is formed.

The core embedded in the longitudinal direction of the toothed belt preferably has a tensile modulus of elasticity of 25000 MPa or more. That is, the tensile modulus of elasticity is 25000MP.
If the core is less than a, a sufficient tensile elastic modulus cannot be obtained, and when a high load is applied, the belt pitch on the tension side is elongated, and a deviation from the pulley pitch occurs. I will. In this case, the tooth load distribution at the pulley winding portion becomes uneven, and a larger load is applied to one tooth. As a result, the teeth may be damaged and durability may be reduced. Therefore, a core wire having a tensile modulus of elasticity of 25000 MPa is used, and a fine pitch, that is, a core wire diameter of 1.1 to 1.1 is used.
If the core is buried at a pitch higher than the normal driving pitch of 1.4 times, sufficient belt elasticity can be obtained, and even if a high load is applied, the extension of the belt tooth pitch is kept small and sufficient tooth chipping durability is achieved. Nature can be maintained.

The core wire has a tensile strength of 800 MPa.
It is preferable to use the above. This means that if the cord has a tensile strength of less than 800 MPa, a sufficient belt tensile strength cannot be obtained, and the cord will fatigue early due to the belt tension side tension generated when a high load is applied, This is because the belt may be cut. That is, it is usually 10 times the tension on the tension side.
If the belt tension is not doubled, the core wire fatigue will be promoted. Therefore, as described above, the core wire preferably has a tensile strength of 800 MPa or more.

Next, the shape of the toothed belt according to the first invention will be described.

The toothed belt has teeth that are inclined in the opposite direction from the vicinity of the center of the belt width. For example, teeth having no inclination (straight teeth) will intermittently collide with the pulley tooth bottoms when biting with the pulleys, so that noise during traveling will increase. In addition, if the teeth (helical teeth) that are inclined only in one direction are provided, the bottom of the pulley teeth will be in continuous contact with the pulley, so that noise during traveling is reduced. Since the belt is shifted by the helical teeth, the belt end face is damaged. Therefore, in the case of a helical tooth, the limit is to set the helical tooth angle (the inclination angle of the tooth) to 10 ° to 15 °. However, the helical angle is 10 ° -15
In °, the noise reduction effect due to the inclined teeth is
I can't get enough. In addition, when the belt width is small, the effect is particularly small. Therefore, as in the first invention, the teeth are inclined in the opposite direction from the vicinity of the center of the belt width, so that the teeth of the belt continuously mesh with the teeth of the pulley when the teeth of the belt are engaged. Is significantly reduced. Moreover, by inclining the teeth in the opposite direction, the belt does not shift, and the inclination angle can be increased. Thus, a large noise reduction effect can be obtained even if the belt is narrow. Further, for example, straight teeth, or
In the case of a helical tooth, it is necessary to provide a flange on the pulley, so that a rubbing noise occurs between the belt end and the flange. This is a problem particularly when used for automatic doors and the like. On the other hand, by inclining the pair of right and left teeth in opposite directions as in the first invention, it is possible to control the position in the belt width direction even without a flange, thereby avoiding generation of the flange rubbing sound. .

Further, the pair of left and right teeth in the belt width direction are connected to each other so as to substantially coincide with the belt longitudinal direction at a substantially central position in the belt width direction. preferable. That is, if there is a shift between the pair of left and right teeth near the center, at the time of high load transmission,
There is an inconvenience that the deformation of the teeth due to a large tooth load is greatly deformed in a C-shape, and the durability of missing teeth is reduced. On the other hand, when there is no deviation near the center, even if a large tooth load is applied, the deformation of the teeth is suppressed to a small level, and as a result, high durability of tooth missing is maintained.

In addition, the pair of left and right teeth in the belt width direction are preferably formed so as to be staggered in the belt longitudinal direction at both end positions in the belt width direction. In this case, the noise can be further reduced while maintaining the tooth chipping durability.

As described above, "forming at both end positions in the belt width direction so as to be staggered in the longitudinal direction of the belt" means, for example, a pair of right and left teeth in the belt width direction. May be different from each other. Alternatively, the pair of left and right teeth in the belt width direction may have different lengths in the belt width direction from each other. In this way, while being connected to each other so as to substantially coincide with the belt longitudinal direction at a substantially central position in the belt width direction, the formation of teeth staggered in the belt longitudinal direction at both end positions in the belt width direction is achieved. Realize.

In the toothed belt as described above, a cloth having an elongation of 50% or more in the belt width direction and the longitudinal direction may cover the surface of the teeth of the belt. By doing so, the impact at the time of meshing is reduced by the cushion effect of the cloth, and the noise is further reduced. Here, it is preferable that the cloth has an elongation of 50% or more in both the vertical and horizontal directions. If the elongation is 50% or less, the cloth easily fits on the tooth surface when the inclination angle of the tooth is large. From this viewpoint, the cloth preferably has an elongation of 50% or more in both the vertical and horizontal directions. Specifically, for example,
As described in claim 7, a knitted fabric may be used. In this case, it will have an elongation of 50% or more in both the vertical and horizontal directions,
Noise can be reliably reduced along the tooth surface easily.

The thermoplastic elastomer forming the main body of the toothed belt may be, for example, a polyurethane elastomer as described in claim 8.
T _B 15 MPa, as polyurethane elastomers can satisfy 250% E _B, include the following.

That is, the physical properties of the polyurethane elastomer are determined by the types of the long-chain polyol of the soft segment, the diisocyanate of the hard segment, and the short-chain polyol (chain extender) of the hard segment.

Therefore, as the long-chain polyol of the soft segment, either a polyester polyol or a polyether polyol may be used.

The long-chain polyester polyol of the soft segment includes polyethylene adipate, polybutylene adipate, polyhexene adipate, polyneopenten adipate or poly-3-methyl-1, which is a condensate of a polycarboxylic acid and a low molecular weight polyol. 5-pentene adipate or polycaprolactone polyol obtained by ring-opening polymerization of ε-caprolactone, or polyβ-methyl-δ-valerolactone polyol obtained by ring-opening polymerization of β-methyl-δ-valerolactone, Polycarbonate obtained by condensation of 1,6-hexanediol, 1,4-butanediol, 1,3-butanediol, neopentyl glycol or the like with phosgene, chloroformate, dialkyicarbonate or diallylcarbonate It is preferable to use the door polyol alone or in plural.

Among these polyols, particularly effective polyols for improving the physical properties (T _B and E _B ) of the elastomer include polyethylene adipate, polycaprolactone polyol and poly β-methyl-δ valerolactone polyol. Can be

Further, examples of the polyester polyol include terephthalic acid, isophthalic acid, phthalic anhydride, succinic acid, adipic acid, azelaic acid, sebacic acid, trimellitic anhydride, ε-caprolactone and β-caprolactone.
At least one acid of methyl-δ-valerolactone, for example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedimethanol and 3- A polymer with at least one glycol of methyl-1,5-pentanediol is exemplified.

As the long-chain polyether polyol having a soft segment, a copolymer of polytetramethylene ether glycol obtained by ring-opening polymerization of tetrahydrofuran, and tetrahydrofuran and ethylene oxide or propylene oxide is preferably used. The soft segment long chain polyether-based polyol preferably has a number average molecular weight of 500 to 5,000, and is preferably used alone or in combination (including copolymerization).

Examples of the hard segment diisocyanate include bulky molecules such as 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate, para-phenylene diisocyanate, transcyclohexane 1,4-diisocyanate, and 1,5-diisocyanate.
It is preferable to use naphthalene diisocyanate or tolidine diisocyanate alone or in combination.

Among these, 4,4'-diphenylmethane diisocyanate, para-phenylene diisocyanate and tolidine diisocyanate are particularly effective diisocyanates for improving the physical properties and heat resistance of the elastomer.

Examples of the hard-chain short-chain polyol include ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, bisphenol A, and 1,4-bis- (β-hydroxyethoxy).
It is preferable to use benzene alone or in combination.

As the thermoplastic elastomer forming the main body of the toothed belt, a polyester elastomer is also effective.
_B 15 MPa, as the polyester elastomer satisfies the 250% E _B, the following polyester-polyether type include thermoplastic polyester elastomers and polyester-polyester type.

As a polyester / polyether type thermoplastic polyester elastomer, a typical example of the polyester having a hard segment is polybutylene terephthalate (PBT) obtained by combining butanediol and dimethyl terephthalate. Ethylene glycol may be used instead of butanediol, and 2,6-naphthalenedicarboxylic acid may be used instead of dimethyl terephthalate. A typical example of the soft segment polyester is polytetramethylene ether glycol (PTMG), but poly (1,2 propylene oxide) glycol or poly (ethylene oxide) glycol may be used.

On the other hand, in the case of a polyester / polyester type thermoplastic polyester elastomer, the polyester of the hard segment of the above-mentioned polyester / polyether type thermoplastic polyester elastomer (such as PBT) is used as the hard segment polyester. Good. As the polyester of the soft segment, a polylactone type may be used as the fatty acid polyester.

Further, as the thermoplastic elastomer,
For example, as described in claim 10, a polyamide elastomer may be used. In particular, a polyamide elastomer satisfying T _{B of} 15 MPa and E _{B of} 250% may have the following structure.

That is, as the hard segments, nylon 6, nylon 66, nylon 610, nylon 1
A polyamide selected from 1, 1 and nylon 12 may be used. As the soft segment, a long polyether polyol such as polytetramethylene ether glycol and polyoxypropylene glycol, or a long polyester polyol such as polyethylene adipate and polybutylene adipate may be used.

The above-mentioned thermoplastic elastomers of polyurethanes, polyesters and polyamides may contain, if necessary, fillers, coloring agents, antistatic agents, flame retardants, antioxidants, ultraviolet absorbers, light stabilizers, hydrolysis inhibitors. Further, additives such as plasticizers, lubricants, preservatives, fungicides, solid lubricants, lubricating oils, and greases may be used.

In particular, it is important to reduce and stabilize the tooth surface friction coefficient in order to reduce friction noise at the time of meshing, prevent heat generation due to friction, or suppress wear. It is preferable to add a lubricant or the like. Among these lubricants, solid lubricants include, for example, molybdenum disulfide, graphite, tungsten disulfide, boron nitride, graphite fluoride, melanin cyanurate, and fluorine resin represented by ethylene tetrafluoride. May be used.
As the lubricating oil, a naphthenic or paraffinic mineral oil, or a synthetic oil such as an ester or silicone oil may be used. Further, as the grease, a grease composed of a mineral oil or a synthetic oil and a metal soap or a composite soap as a thickener may be used, and a solid lubricant may be added to these.

Next, a second invention relates to a toothed pulley suitably used for the above-mentioned toothed belt. More specifically, the outer peripheral surface of the pulley is substantially centered in the belt width direction. From both ends in the opposite direction in the longitudinal direction of the belt, the tooth grooves formed at a predetermined pitch interval in the longitudinal direction of the belt, and concave along the circumference at a substantially central position in the belt width direction. And a vertical groove. In this case, the left and right tooth spaces are separated by the vertical grooves. Here, for example, if the left and right tooth grooves are connected without being separated, the connection portion of the belt will push up the connection portion of the belt teeth, which may adversely affect the tooth chipping durability. By separating the tooth spaces by the longitudinal grooves as in the invention of the above-mentioned invention, the above-mentioned disadvantages can be avoided.

The vertical groove may be formed so that the depth thereof is greater than the tooth groove depth. In this case, since the vertical groove serves as an escape groove for compressed air when biting, noise can be further reduced.

According to a third aspect of the present invention, there is provided a transmission using the toothed belt, and more specifically, the pressure surfaces of the teeth are formed in a convex arc shape as in the thirteenth aspect. Item 10. A toothed belt comprising: the toothed belt according to any one of Items 10, and a toothed pulley having a shape substantially similar to the tooth shape of the toothed belt, the toothed end of the toothed belt having a tooth groove contacting its bottom. Is a specific matter.

In this case, by forming the pressure surfaces of the teeth of the toothed belt as convex arc surfaces, interference of the pressure angle when the teeth are meshed with the pulley tooth grooves is reduced. Wear of the surface is suppressed, and resistance at the time of disengagement is reduced. As a result, generation of unnecessary stress at the belt tip is avoided. In addition, since the teeth are formed to have a large volume by being formed in a convex shape, deformation of the teeth under a high load can be suppressed to a small value. By avoiding the generation of unnecessary stress at the belt tip and suppressing the deformation of the teeth under a high load, high tooth chipping durability can be obtained.

Further, by contacting the tip of the belt tooth with the bottom of the tooth groove of the pulley, it is possible to prevent the belt land from colliding with the tooth top of the pulley due to excessive surface pressure, thereby further reducing noise. .

Further, as a belt transmission device, as in the fourteenth aspect, a toothed belt according to any one of the first to tenth aspects, and a tooth having a tooth groove substantially similar to the tooth shape of the toothed belt. And the toothed belt is provided with the toothed belt in such a direction that the end of the toothed belt in the belt width direction bites into the tooth groove of the toothed pulley earlier than the central part thereof. The belt may be run. in this case,
When the teeth of the toothed belt bite into the tooth grooves of the pulley, the compressed air is not discharged in the direction of the pulley end surface, so that sound is prevented from being emitted outward, and noise is further reduced. Can be

A fourth aspect of the present invention relates to a toothed belt manufacturing apparatus for manufacturing an open-ended toothed belt according to any one of the first to tenth aspects. A molding mold formed by laminating a pair of cylinders having an outer peripheral surface on which helical teeth are formed at pitch intervals in the axial direction of the cylinder so that the helical teeth are opposite to each other; and a thermoplastic elastomer. Extruder to heat and melt, and to project from the die toward the molding mold,
A feeding machine for feeding the core wire in a state where a predetermined tension is applied to the molding mold, and pressure applying means for pressing the thermoplastic elastomer toward tooth spaces formed by the helical teeth of the molding mold. Preparation is a specific matter. Here, as the "pressure applying means", for example, a cylindrical pressing roll may be used so that the thermoplastic elastomer is sandwiched between the molding mold and the pressing roll.

In this case, the thermoplastic elastomer is extruded onto the outer peripheral surface of the molding mold, and the core wire fed from the feeding machine is integrated with the thermoplastic elastomer. Then, while rotating the molding mold around its cylindrical axis, the thermoplastic elastomer is pressed by the pressure applying means so as to be filled in the tooth space of the molding mold, so that the teeth inclined in opposite directions to each other. Is continuously produced.

On the other hand, the fifth aspect of the present invention relates to claims 1 to 1
The present invention relates to a toothed belt manufacturing apparatus for manufacturing any of the endless toothed belts according to any one of claims 0 to 15, and more specifically, at least having an outer peripheral surface on which helical teeth are formed at a predetermined pitch interval as in claim 16. A molding mold formed by laminating two or more cylinders in the cylinder axis direction such that the helical teeth thereof are opposite to each other, and the above-described mold disposed at a position separated by a predetermined distance from the molding mold A tooth number adjusting roll having the same shape as the molding mold, and a core wire in a state of applying a predetermined tension is spirally wound in the cylinder axis direction between the molding mold and the tooth number adjusting roll. A core winding machine that feeds the core wire in a cylinder axis direction at a predetermined pitch while feeding the core wire, an extruder that heats and melts a thermoplastic elastomer, and projects from a die toward the molding mold; The elastomer is for a particular matter to be provided with a pressure applying means for pressing toward the tooth groove formed by the helical teeth of the forming mold.
Here, as the “pressure applying means”, as described above,
For example, a cylindrical pressing roll may be used. Also,
The "core winding machine" is configured so that the core wire is wound while moving along the cylinder axis so that the core wire is spirally wound in the cylinder axis direction of the molding mold and the number of teeth adjusting roll. Good to do. In addition, "Roll for adjusting the number of teeth"
Preferably, the distance from the molding mold can be changed.

In this case, the core wire is wound in advance between the molding mold and the number-of-teeth-rolls by a core winding machine, and the core wire wound around the molding mold by an extruder. Extrudes a thermoplastic elastomer. Then, while rotating the molding mold and the number-of-teeth adjusting roll about its cylindrical axis, the thermoplastic elastomer is pressed by the pressure applying means so as to fill the tooth space of the molding mold, so that the left and right sides thereof are pressed. An endless toothed belt in which teeth of opposite directions are formed is formed. When the formation of the toothed belt is completed over its entire length, the arrangement distance between the molding mold and the number-of-teeth adjusting roll is reduced, whereby the toothed belt is easily removed from the mold.

Here, the molding mold and the number-of-teeth-adjusting roll are used to form at least two or more cylinders each having an outer peripheral surface on which helical teeth are formed, in such a manner that the helical teeth are opposite to each other in the cylinder axial direction. The toothed belt is in a state where a plurality of toothed belts are connected in the width direction. For this reason, a plurality of belts can be obtained by a single molding by cutting the width of the removed belt.

Further, by adjusting the distance between the molding mold and the number-of-teeth adjusting roll, the number of teeth is changed, and without preparing a mold corresponding to the number of teeth, the number of teeth can be adjusted. Endless toothed belts are manufactured.

According to a sixth aspect of the present invention, there is provided a method of manufacturing a toothed belt for manufacturing the toothed belt according to any one of the first to tenth aspects. At intervals, at least two or more cylinders having an outer peripheral surface on which the helical teeth are formed, using a molding mold formed by overlapping the helical teeth in the cylinder axis direction so that the helical teeth are opposite to each other, While rotating the molding mold, a core wire is disposed on the outer peripheral surface of the molding mold, and the thermoplastic elastomer melted by heating is filled in the tooth space formed by the helical teeth of the molding mold. This is a method of specifying that the formation of the toothed belt is continuously performed by pressing the belt with the belt. In this case, claim 15 or claim 16
As in the described invention, toothed belts having teeth inclined in opposite directions are produced continuously.

[0052]

As described above, according to the toothed belt of the first invention, it is possible to sufficiently withstand a large tooth load and a large distortion and maintain its durability. It becomes a toothed belt. Also, noise during operation can be significantly reduced. In particular, even if the toothed belt has a narrow width, the above-described durability and noise reduction effects can be obtained.

According to the toothed pulley according to the second aspect of the present invention, it is possible to avoid affecting the durability of the toothed belt with missing teeth and to further reduce noise.

Further, according to the toothed belt transmission of the third aspect, the durability of the toothed belt with missing teeth can be maintained, and noise can be reduced.

In addition, according to the toothed belt manufacturing apparatus and the manufacturing method according to the fourth to sixth aspects of the present invention, it is possible to continuously manufacture toothed belts having teeth inclined in opposite directions. As described above, inconveniences such as manufacturing one by one and requiring a large number of molds can be avoided, and the manufacturing efficiency can be greatly improved.

[0056]

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

FIG. 1 shows a toothed belt transmission 9 using a toothed belt and a toothed pulley according to an embodiment of the present invention, wherein 1 is a toothed belt having teeth inclined in opposite directions, and 2 is a toothed belt. A toothed pulley for the toothed belt 1.

First, the toothed belt 1 will be described.

As shown in FIG. 2, the toothed belt 1 has teeth (belt teeth) which are inclined in a direction opposite to each other in the longitudinal direction of the belt from substantially the center in the belt width direction to both ends thereof.
11 and 12 are formed at predetermined pitch intervals in the belt longitudinal direction. The belt lands 16, 16 are formed by a pair of belt teeth 11, 11, 12, 12 adjacent in the belt longitudinal direction.

The pair of left and right belt teeth 11 and 12 in the belt width direction are connected to each other at a substantially central position in the belt width direction so as to substantially coincide with the belt longitudinal direction. On the other hand, a pair of left and right belt teeth 11,
12 are formed so that the inclination angles thereof are different from each other (see θ ₁ and θ _{2 in} the figure), whereby the pair of left and right belt teeth 11 and 12 in the belt width direction are positioned at both ends in the belt width direction. , Which are staggered in the longitudinal direction of the belt (see L1 in the figure).

As shown in FIG. 34, each of the belt teeth 11, 12 has a pressure surface 12a, 12a formed in a convex arc shape. Such a tooth shape may be, for example, a round tooth (STPD tooth shape).

As shown in FIG. 4, the toothed belt 1 has a main body 1 made of a thermoplastic elastomer.
5 and a core 13 embedded in the main body 15. This cord 13 has a fine pitch, that is,
It is buried in the main body 15 at a normal driving pitch of 1.1 to 1.4 times the core diameter or more.

Here, the thermoplastic resin constituting the main body 15 is used.
As the elastomer, for example, T _B15MPa or more,
E_BPoly of 250% or more and rubber hardness of 80 ° to 95 °
Urethane elastomers, polyester elastomers,
Or using any of the polyamide elastomers
do it. Specifically, for example, T_B51MPa, E_B
480% polyurethane with a rubber hardness of 90 °, more specific
Specifically, for example, as a composition, a long chain of a soft segment
Polycaprolactone diol as polyol, hard
4,4'-diphenyl as a segment diisocyanate
As methane diisocyanate and short-chain polyols
Polyurethane of 1,4-butanediol (manufacturer name:
Japan Miracleton Co., Ltd., part number E590PYWD)
What you need to do.

On the other hand, the core wire 13 may have a tensile modulus of 25,000 MPa or more and a tensile strength of 800 MPa or more. Specifically, for example, a tensile modulus of 60000 MPa and a tensile strength of 140 MPa
An aramid cord of 0 MPa (manufacturer: Dupont Toray, trade name: Kevlar K49 type 968) may be used.

Then, on the tooth surface of the toothed belt 1,
As shown in FIG. 4, a knitted fabric 14 as a cloth is in close contact with and covers. This knitted fabric has an elongation of 50% or more in the belt width direction and the longitudinal direction.

Next, the operation and effect of the toothed belt in the above embodiment will be described.

First, the operation relating to the physical properties of the toothed belt
The effect will be described.

As the thermoplastic elastomer of the main body 15,
By allowing use or more of 15MPa to T _B, it is possible to form the toothed belt 1 it is possible to sufficiently withstand even for large tooth loads. Also, E
_{By using B} having a content of 250% or more, it is possible to form the toothed belt 1 in which the generation of cracks is avoided even with a large distortion. Further, the rubber hardness is 80
The degree of rubber hardness is 8 by using
Tooth skipping that may occur when the angle is 0 ° or less,
It is possible to avoid wear of the pressure surface of the tooth, and deterioration due to self-heating caused by bending which may occur when the rubber hardness exceeds 95 °. As a result, it is possible to form the toothed belt 1 that maintains high durability even under a high load and a large load.

Next, the function and effect of the shape of the toothed belt 1 will be described.

By forming the belt teeth 11 and 12 inclined in the opposite direction from the vicinity of the center in the belt width direction, the belt teeth 11 and 12 are engaged with the tooth groove 21 of the pulley 2 when the pulley 2 is engaged. Is continuously bitten, so that noise can be extremely reduced.
In addition, by inclining the belt teeth 11 and 12 in the opposite direction, the belt does not shift, and the angle of inclination can be increased. Thereby, even if the toothed belt 1 is narrow, a large noise reduction effect can be obtained. Further, for example, even if the toothed pulley 2 does not have a flange, position control in the belt width direction can be performed, and generation of a flange rubbing sound can be avoided.

Further, since the left and right belt teeth 11 and 12 are connected near the center thereof, the deformation of the teeth is suppressed to a small level even when a large tooth load is applied, and as a result, a high durability of missing teeth is maintained. Will be able to In addition, the pair of left and right belt teeth 11 and 12 are staggered in the longitudinal direction of the belt at both end positions in the width direction of the belt (see L1 in FIG. 2).
The noise can be further reduced.

Further, the toothed belt 1 has a knitted cloth 14 having an elongation of 50% or more in the belt width direction and the longitudinal direction.
However, since the surface of the belt teeth 11 and 12 of the toothed belt 1 is covered, the impact at the time of meshing is reduced by the cushion effect of the knitted fabric 14, so that noise can be further reduced. become. In addition, since the knitted fabric 14 has an elongation of 50% or more in both the vertical and horizontal directions, even if the inclination angle of the belt teeth 11 and 12 is large, the surface of the belt teeth 11 and 12 is surely formed. Along with this, noise can be reliably reduced.

Next, the toothed pulley 2 and the toothed belt transmission 9 will be described.

The toothed pulley 2 is, as shown in FIG.
Tooth grooves (pulley tooth grooves) 21 which are inclined in opposite directions in the longitudinal direction of the belt from substantially the center in the belt width direction to both ends thereof and are formed at a predetermined pitch in the longitudinal direction of the belt.
Are formed on the outer peripheral surface. This pulley tooth groove 21
The shape of the belt teeth 11, 1 of the toothed belt 1 is
2, and the depth of the pulley tooth groove 21 is set so that the tooth tip of the toothed belt 1 contacts the bottom thereof (see FIG. 4). For this reason, the tooth crest 21a of the toothed pulley and the belt lands 16, 16 of the toothed belt 1 are not in contact with each other.

The toothed pulley 2 is formed with a vertical groove 22 which is concave along the circumference at a substantially central position in the belt width direction. It is formed to be deeper than the depth of the tooth groove 21.

Such a toothed belt 1 and a toothed pulley 2
As shown in FIG. 1, the toothed belt transmission 9 using the toothed belt pulley 2 of the toothed pulley 2 has the belt teeth 11, 12 of the toothed belt 1 with their ends in the belt width direction larger than the central portion thereof. The toothed belt 1 is caused to run in such a direction as to bite into the groove 21 first (see the arrow in FIG. 1).

Next, the operation and effect of the toothed pulley 2 and the toothed belt transmission 9 will be described.

In the toothed pulley 2, since the left and right pulley tooth grooves 21 are separated by the vertical groove 22, for example, when the left and right pulley tooth grooves 21 are connected, a belt tooth may be generated at a connection portion thereof. Can be prevented from being pushed up, and the influence on the tooth chipping durability can be avoided.

Further, since the vertical groove 22 is formed so that the depth of the vertical groove 22 is deeper than the depth of the pulley tooth grooves 21 and 21, the vertical groove 22 serves as an escape groove for compressed air when biting with the toothed belt 1. Thus, the noise can be further reduced.

On the other hand, in the above-mentioned transmission, the pressure surfaces 12a of the belt teeth 11, 12 of the toothed belt 1 are formed into a convex arcuate surface, so that the belt teeth 11, 12 mesh with the pulley tooth grooves 21. Pressure angle interference at the time of
In particular, abrasion of the pressure surface during high-speed running can be suppressed, and resistance at the time of disengagement can be reduced. As a result, it is possible to avoid the generation of unnecessary stress on the belt tip. Also, by forming the belt teeth 11 and 12 in a convex shape, the volume of the teeth is increased, so that the deformation of the teeth under a high load can be suppressed to a small value, and unnecessary stress on the belt tooth tips can be reduced. Thus, high tooth chipping durability can be obtained by avoiding the occurrence of cracks and suppressing the deformation of the teeth under a high load.

The belt tooth 1 is located at the bottom 21b of the pulley tooth groove.
By bringing the tip portions 1 and 12 into contact with each other, it is possible to prevent the belt land portions 16 and 16 from colliding with the pulley tooth top 21a due to excessive surface pressure, and to further reduce noise.

Further, the belt teeth 1 of the toothed belt 1
By running the toothed belt 1 in such a direction that the end portions in the width direction of the belts 1 and 12 bite into the pulley tooth grooves 21 of the toothed pulley 2 more than the center portion thereof, The belt tooth 1 of the toothed belt 1 is
When the bites 1 and 12 bite, the compressed air is not discharged toward the end face of the pulley 2. Therefore, it is possible to prevent the sound from being emitted toward the outside, and it is possible to further reduce the noise.

Next, a manufacturing apparatus and a manufacturing method for manufacturing the toothed belt 1 according to the present embodiment will be described.

FIG. 5 or FIG. 6 shows a manufacturing apparatus for manufacturing the toothed belt 1 according to this embodiment, and this manufacturing apparatus is used for manufacturing an open-end belt.

In the same figure, 3 is a feeding device for feeding out the core wire 13, 4 is an extruder for projecting the heated and melted thermoplastic elastomer, 5 is a pressing roll as pressure applying means, and 61 is a toothed belt 1. A molding mold for molding the teeth, a take-up device 71 for taking the formed toothed belt 1, and a winding machine 72 for taking up the formed toothed belt 1.

As shown in FIG. 7, the molding mold 61 includes a pair of cylinders 63, 64 having outer peripheral surfaces on which helical teeth 63a, 63a,. 63a and 64a are formed to overlap each other in the direction of the cylinder axis X1 so that they are opposite to each other. As shown in FIG. 5 or FIG. 6, the molding mold 61 is rotatably disposed around the cylinder axis X1.

The extruder 4 heats and melts the thermoplastic elastomer and projects the thermoplastic elastomer from the dies 41 toward the molding mold 61. It is arranged to be. The extruder 4 is a die 41
The core wire 13 passes through the dice 41. The core wire 13 is configured to protrude from the protrusion of the die 41 in a state where the core wire 13 is integrated with the thermoplastic elastomer from the extrusion device 4.

The feeder 3 feeds the core 13 to which a predetermined tension has been applied to the molding mold 61 through the die 41 of the extruder 4, and the core 13 is wound. A plurality of drums 31,
, And a tension applying device 32 that applies a predetermined tension to the core wire 13 provided on each of the drums 31. In FIG. 5, the tension applying device 32 is illustrated only on one drum 31, and the illustration of the tension applying device provided on the other drum 31 is omitted.

The pressing rolls 51, 51 are made of a thermoplastic elastomer containing the core 13 fed from the die 41, and the adjacent helical teeth 63a, 63a of the molding mold 62.
Tooth groove 63 formed by 63a, 64a, 64a
b, 64b (see FIG. 7). Each of the pressing rolls 51 is formed of a cylindrical member, and is arranged adjacent to the molding mold 61 so as to be rotatable about an axis in the same direction as the cylindrical axis X1 (FIG. 5). And
The thermoplastic elastomer is pressed against the press roll 61 so as to sandwich the thermoplastic elastomer between the molding mold 61 and the press roll 51.

The pulling device 71 pulls the toothed belt 1 formed in the forming mold 61 and includes a plurality of rotatably mounted rollers. In addition, the winding machine 7
Reference numeral 2 denotes a roller rotatably mounted so as to wind up the toothed belt 1 taken up by the take-up device 71.

FIG. 5 or FIG. 6 shows a manufacturing apparatus for manufacturing an open-ended toothed belt. On the other hand, an apparatus for manufacturing an endless toothed belt is configured as shown in FIG. .

In the same figure, 62 is a molding mold for molding the teeth of the toothed belt, 82 is a roll for adjusting the number of teeth having the same shape as the molding mold, and 81 is the core wire 13 formed by the molding roll 62 and the number of teeth. This is a core winding machine that winds around the adjusting roll 82. Although not shown, the endless toothed belt manufacturing apparatus also includes an extruder 4. Also, the same structures as those of the open-end toothed belt manufacturing apparatus are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, the molding mold 62 includes four cylinders 63 to 66 having an outer peripheral surface on which helical teeth 63a to 66a are formed at a predetermined pitch interval. To 66a are opposite to each other.
They are formed so as to be overlapped in one direction (see the solid line and the two-dot chain line in the figure).

On the other hand, as described above, the tooth number adjusting roll 82 is formed in the same shape as the molding mold 62, and is disposed at a position separated from the molding mold 62 by a predetermined distance. (See FIG. 8). The number-of-teeth adjusting roll 82 is disposed so that the distance from the molding mold 62 can be adjusted (see the dashed-dotted arrow in the figure). And it is arrange | positioned rotatably around the cylinder axis X2.

The core winding machine 81 winds the core wire 13 around the forming mold 62 and the number-of-teeth adjusting roll 82 with a predetermined tension applied. The core winding machine 81 is configured to wind the core wire 13 between the molding mold 62 and the tooth number adjusting roll 82 while moving the core wire 13 in the cylinder axis X1 direction of the molding mold 62. As a result, the core wire 13 is spirally wound.

Next, the production of the toothed belt in the above-described apparatus for producing a toothed belt will be described.

First, in the open-end toothed belt manufacturing apparatus (see FIG. 5 or FIG. 6), the feeding machine 3
The core 13 is passed through the die 41 in a state where a predetermined tension is applied to the core 13. At this time, the thermoplastic elastomer that has been heated and melted is extruded from the extruder 4, and is extruded onto the outer peripheral surface of the molding mold 61 in a state where the core wire 13 and the thermoplastic elastomer are integrated in the die 41.

Then, while rotating the molding mold 61 around its cylindrical axis X1, the pressing roll 5 is pressed so that the thermoplastic resin containing the core wire 13 is filled in the tooth space of the molding mold 61. Molding is performed. The formed belt 1 is taken out of the molding mold 61 by a take-up device 71 and taken up by a take-up machine 72.

On the other hand, in the endless toothed belt manufacturing apparatus (see FIG. 8), first, the core wire 13 is wound by the winding machine 81 between the molding mold 62 and the tooth number adjusting roll 82. I do. Next, the thermoplastic elastomer heated and melted by the extruder 4 is extruded against the core wire 13 of the molding mold 62. The press roll 51 presses the thermoplastic elastomer against the mold 62 while rotating the mold 62 and the number-of-teeth adjusting roll 82 to perform molding. If the forming by the pressing roll 51 is performed over the entire length of the belt 1 wound around the forming mold 62 and the number-of-teeth adjusting roll 82, the forming is completed. When this molding is completed, the number of teeth adjusting roll 82 is moved so that the interval between the molding mold 62 and the number of teeth adjusting roll 82 is reduced, and the belt 1 is moved.
Die out. As shown in FIG. 6, the belt 1 thus die-cut has four cylinders 63-66.
, The toothed belt 1 having a pair of left and right teeth is connected in the belt width direction. For this reason, the width of the belt body 1 is cut to complete the toothed belt 1.

Next, the operation and effects of the above-described apparatus and method for manufacturing a toothed belt will be described.

In the above-described open-end toothed belt manufacturing apparatus, the teeth 1 inclined to the left and right in opposite directions to each other.
The toothed belt 1 having 1 and 12 can be manufactured continuously, and the manufacturing efficiency can be greatly improved.

In the endless toothed belt manufacturing apparatus, a plurality of toothed belts can be obtained by a single molding. In addition, the toothed belt 1 is moved by moving the roll 82 for adjusting the number of teeth.
Since the mold can be easily removed, there is no need for many steps such as splitting the mold up and down and twisting the mold left and right, as in the past, greatly improving the manufacturing efficiency. Will be able to do it. Further, the molding mold 62
By adjusting the distance between the toothed belt 1 and the roller 82 for adjusting the number of teeth, the number of teeth of the toothed belt 1 to be manufactured is changed. Therefore, without preparing a mold corresponding to the number of teeth,
A belt with an arbitrary number of teeth can be manufactured. <Other Embodiments> Note that the present invention is not limited to the above-described embodiments, but includes various other embodiments. That is, in the above embodiment, the toothed belt 1
The inclination angles of the belt teeth 11 and 12 are made different from each other on the left and right (see θ ₁ and θ _{2 in} FIG. 2). However, the present invention is not limited to this.
Tilt angle in the same (see theta ₁ of the drawing), the belt width direction to vary the length (W ₁ of the drawing, W ₂ reference) toothed belt 1 'very good and so. Even in this case, at the central portion in the belt width direction, the positions of the pair of left and right belt teeth 11 and 12 are aligned and connected.
At both ends in the belt width direction, a pair of left and right belt teeth 1
There will be a discrepancy between positions 1 and 12 (see L2 in the figure).

[0103]

EXAMPLES In order to verify the effects of the present invention on durability and noise, a durability test and a noise test were conducted. FIG. 10 shows the results of the durability test, and FIG. 12 shows the results of the noise test.

[0104] toothed belt as an embodiment used in the endurance test and noise test, as thermoplastic elastomeric body _{15, T B 51MPa, E B} 480%, and rubber hardness 90 ° of the polyurethane (Manufacturer: Japan Miracleton Co., Ltd., product number E590PYWD) was used. As the composition, polycaprolactone diol is used as the long chain polyol of the soft segment, 4,4'-diphenylmethane diisocyanate is used as the diisocyanate of the hard segment, and 1,4-butanediol is used as the short chain polyol.

The core wire 13 has a tensile modulus of elasticity of 600.
Aramid core wire with 00MPa and tensile strength of 1400MPa (Manufacturer: Dupont Toray, trade name Kevlar K4
9 types 968) were used. The core diameter is φ10mm,
S · Z winding was performed at a core wire pitch of 1.2 mm.

The tooth profile of the toothed belt 1 is an STPD tooth profile composed of a convex arc, and the tooth pitch is 8 m in frontal pitch.
m, and the inclination angle was 30 °. The belt width is 3
0 mm.

The toothed belt 1 was manufactured by the endless toothed belt manufacturing apparatus of the above embodiment.

On the other hand, a toothed belt as a comparative example is formed of chloroprene rubber and has a shape of a straight tooth ST.
The tooth pitch was 8 mm (S8M) in the PD tooth profile. Also,
The belt width was 30 mm. The toothed belt of this comparative example was manufactured by molding and flowing using a cylindrical mold.

In the tooth chipping durability test, a test belt is wound around a driving pulley and a driven pulley, and a set weight and a load torque are applied to the driven pulley. In this state, the test belt was run at a rotation speed of 3400 rpm, and the time required until tooth chipping occurred was measured. The number of teeth of the driving pulley and the number of teeth of the driven pulley are 20.

As shown in FIG. 10, the result of the tooth chipping durability test shows that the toothed belt 1 of the present invention greatly improves the durability.

On the other hand, in the noise test, as shown in FIG.
Test belt 1 for driving pulley 10a and driven pulley 10b
To give a set weight to the driven pulley 10b. In this state, the belt 1 is rotated at a rotational speed of 300 to 500.
The vehicle was run at 0 rpm, and the noise level was measured with the microphone 10. The distance between the microphone 10 and the pulley 10a is 300 mm.

As shown in FIG. 12, as a result of this noise test, the example is lower by about 5 to 20 dBA than the comparative example, and the toothed belt 1 of the present invention reliably reduces noise. You can see that.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a toothed belt transmission of the present invention.

FIG. 2 is a diagram showing tooth surfaces of a toothed belt.

FIG. 3 is a half sectional explanatory view showing a toothed pulley.

FIG. 4 is a sectional view showing an AA section in FIG. 2;

FIG. 5 is a schematic front view showing a manufacturing apparatus for manufacturing an open-ended toothed belt.

FIG. 6 is a schematic plan view showing a manufacturing apparatus for manufacturing an open-ended toothed belt.

FIG. 7 is an explanatory front view showing a molding mold.

FIG. 8 is a view corresponding to FIG. 5, showing a manufacturing apparatus for manufacturing an endless toothed belt.

FIG. 9 is a view corresponding to FIG. 2, showing a tooth surface of a toothed belt according to another embodiment.

FIG. 10 is a diagram showing the results of a tooth chipping durability test.

FIG. 11 is an explanatory diagram showing an aspect of a noise test.

FIG. 12 is a diagram showing the results of a noise test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 'Toothed belt 2 Toothed pulley 3 Feeder 4 Extruder 9 Toothed belt transmission 11, 12 Belt teeth (teeth) 13 Core wire 14 Knitted fabric 15 Main body 21 Pulley tooth groove (tooth groove) 22 Vertical groove 41 Dies 51 Pressing roll (pressure applying means) 61,62 Mold for forming 63-66 Cylindrical 81 Core winding machine 82 Roll for adjusting the number of teeth 12a Pressure surface 63a-66a Helical tooth 63b-66b Tooth groove (forming mold)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29D 29/08 B29D 29/08 F16H 7/02 F16H 7/02 A 55/38 55/38 A // B29K 67:00 75:00 77:00 105: 22 (72) Inventor Eijiro Nakajima 3-2-1-15 Meiwadori, Hyogo-ku, Kobe City, Hyogo Prefecture Inside Bando Chemical Co., Ltd. (72) Inventor Yuji Sekiguchi Hyogo, Kobe City, Hyogo Prefecture F-term (reference), 3-2-15, Meiwadori, Bando, Japan Bando Chemical Co., Ltd.

Claims (17)

[Claims] 1. A tensile strength of 15 MPa or more and an elongation of 25
A main body formed of a thermoplastic elastomer having a rubber hardness of 80 to 95 ° and a tensile modulus of elasticity of 25,000 MPa or more and a tensile strength of 80% or more embedded in the main body.
0MPa or more core wires, and teeth inclined in opposite directions in the belt longitudinal direction from substantially the center in the belt width direction to both ends thereof are formed at predetermined pitch intervals in the belt longitudinal direction. Characterized toothed belt. 2. The toothed belt according to claim 1, wherein a pair of right and left teeth in the belt width direction are connected to each other at substantially a center position in the belt width direction so as to substantially coincide with the belt longitudinal direction. belt. 3. The toothed belt according to claim 2, wherein a pair of left and right teeth in the belt width direction are staggered in a longitudinal direction of the belt at both end positions in the belt width direction. 4. The toothed belt according to claim 3, wherein the pair of left and right teeth in the belt width direction have different inclination angles from each other. 5. The toothed belt according to claim 3, wherein a pair of left and right teeth in the belt width direction have different lengths in the belt width direction. 6. The belt according to claim 1, wherein a cloth having an elongation of 50% or more in a belt width direction and a longitudinal direction adheres to and covers the surface of the belt teeth. A toothed belt, characterized in that: 7. The toothed belt according to claim 6, wherein the cloth is a knitted cloth. 8. The toothed belt according to claim 1, wherein the thermoplastic elastomer is a polyurethane elastomer. 9. The toothed belt according to claim 1, wherein the thermoplastic elastomer is a polyester elastomer. 10. The toothed belt according to claim 1, wherein the thermoplastic elastomer is a polyamide elastomer. 11. A toothed pulley used for the toothed belt according to any one of claims 1 to 10, wherein an outer peripheral surface of the pulley extends from substantially a center in a belt width direction to both ends thereof. Tooth grooves which are inclined in directions opposite to each other in the direction, and are formed at predetermined pitch intervals in the belt longitudinal direction,
A toothed pulley provided with a vertical groove which is concave along the circumference at a substantially central position in the belt width direction. 12. The toothed pulley for a toothed belt according to claim 11, wherein the vertical groove is formed so that its depth is greater than the tooth groove depth. 13. The toothed belt according to claim 1, wherein the tooth pressure surface is formed in a convex arc shape, and the toothed belt has a shape substantially similar to the tooth shape of the toothed belt. A toothed pulley having a tooth groove in which a tooth tip of the toothed belt contacts a bottom part thereof. 14. A toothed belt according to any one of claims 1 to 10, and a toothed pulley having tooth grooves substantially similar to the tooth shape of the toothed belt. A toothed belt transmission device, wherein the toothed belt travels in a direction such that an end portion in a belt width direction bites into a tooth groove of the toothed pulley earlier than a center portion thereof. 15. A toothed belt manufacturing apparatus for manufacturing an open-ended toothed belt according to any one of claims 1 to 10, wherein an outer peripheral surface on which helical teeth are formed is formed at a predetermined pitch interval. A pair of cylinders having a pair of cylinders, a molding mold formed by superposing in the cylinder axis direction such that the helical teeth thereof are opposite to each other, and a thermoplastic elastomer is heated and melted and directed from a die to the molding mold. An extruder for projecting a core wire in a state where a predetermined tension has been applied to the molding mold; and And a pressure applying means for pressing. 16. A toothed belt manufacturing apparatus for manufacturing an endless toothed belt according to any one of claims 1 to 10, wherein the toothed belt has an outer peripheral surface having helical teeth formed at a predetermined pitch interval. A molding mold formed by stacking at least two or more cylinders in the cylinder axis direction so that their helical teeth are opposite to each other, and disposed at a position separated by a predetermined distance from the molding mold A roller for adjusting the number of teeth having the same shape as that of the molding mold, and a core wire in a state where a predetermined tension is applied is spirally wound in the cylinder axis direction between the molding mold and the roller for adjusting the number of teeth. A core winding machine that feeds the core wire in the cylinder axis direction at a predetermined pitch while feeding the core wire, an extruder that heats and melts the thermoplastic elastomer and projects from the die toward the molding mold, The thermoplastic elastomer, toothed belt manufacturing apparatus characterized by comprising a pressure applying means for pressing toward the tooth groove formed by the helical teeth of the forming mold. 17. A method for manufacturing a toothed belt according to claim 1, wherein at least two of the toothed belts have an outer peripheral surface formed with helical teeth at a predetermined pitch interval. Using a molding mold formed by laminating the above cylinders in the cylinder axis direction so that the helical teeth thereof are opposite to each other, while rotating the molding mold, on the outer peripheral surface of the molding mold A cored wire is arranged, and a heated and melted thermoplastic elastomer is pressed so as to fill a tooth space formed by the helical teeth of the molding mold, thereby continuously forming a toothed belt. Method for manufacturing a toothed belt.