JP2001173726A - Toothed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise when power of a toothed belt transmitting mechanism is transmitted. SOLUTION: A belt tooth part side surface of this toothed belt is constituted by recessed and protrusion surfaces which are formed in such a constitution that fine protrusion parts for absorbing shock by elastically deforming when abutting on pulleys and fine recessed parts for forming air passages held between pulleys when abutting on the pulleys are alternately disposed in a belt width direction and the recessed parts of a belt width direction are communicated with them of the belt length direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed belt, and more particularly, to a technical field related to noise reduction during running of a toothed belt.

[0002]

2. Description of the Related Art In the field of OA equipment, general industrial machines, and the like, a synchronous belt transmission is required at a portion where synchronous power transmission is required, using a synchronous belt transmission mechanism constituted by a synchronous belt and a pulley around which the synchronous belt is wound. Have been. The toothed belt includes, for example, a belt main body formed by a belt tooth portion provided at a predetermined pitch on the inner peripheral side of the belt and a belt rear surface portion on the outer peripheral side of the belt, and a belt between the belt tooth portion and the belt rear surface portion. And a spiral cord extending substantially in the belt length direction and forming a pitch in the belt width direction, and a canvas for covering the belt surface on the belt tooth side. Also,
The pulley around which the toothed belt is wound has a configuration in which pulley grooves in which the belt teeth mesh with the peripheral edge are provided at a predetermined pitch.

[0003]

By the way, in the V-belt transmission mechanism, the power is transmitted by continuously moving the belt in and out of the pulley, while in the case of the toothed belt, the belt tooth portion is transmitted to the pulley by the belt. Power transmission is performed by repeating a multi-step operation such as contact and meshing. Therefore, in the toothed belt transmission mechanism, there are many factors that generate noise, such as contact of the belt teeth with the pulley, and the noise during power transmission is larger than that in the V-belt transmission mechanism. There's a problem.

[0004] The present invention has been made in view of such a point, and an object of the present invention is to reduce noise during power transmission of a toothed belt transmission mechanism by improving a toothed belt.

[0005]

Means for Solving the Problems The inventors of the present invention have disclosed a noise generated at the time of power transmission of a toothed belt transmission mechanism, an impact sound generated by an impact when a belt comes into contact with a pulley,
When the belt comes into contact with the pulley, the air that exists between the two is compressed and the air compression noise is generated, and the friction noise generated when the belt slides on the pulley is classified into impact noise and air compression noise. This is intended to reduce by providing fine irregularities on the surface of the belt tooth side. Also, paying attention to the fact that when the belt contacts the pulley, there is a fact that all parts in the belt width direction contact at the same time,
The irregularities are arranged alternately in the belt width direction.

Specifically, the invention of the present application relates to a toothed belt, in which a belt tooth side surface has a fine protrusion that elastically deforms and absorbs an impact at the time of contact with a pulley, And fine concave portions forming an air passage held between the pulleys at the time of contact are alternately arranged in the belt width direction, and the concave portions in the belt width direction communicate with each other in the belt length direction. It is characterized by being constituted by the formed uneven surface.

According to the above configuration, the surface of the belt tooth side is formed of an uneven surface in which fine convex portions and concave portions are alternately arranged in the belt width direction and the concave portions communicate with each other in the belt length direction. When the belt abuts the pulley,
Each convex portion elastically deforms to absorb the impact, the belt tooth portion hits the pulley and the impact sound emitted is reduced, and the air existing between the belt and the pulley is Since the air is released by the passage formed by the series of the concave portions, the air compression noise generated when the air is compressed in the closed space is also reduced.

Here, it is desirable that the average height of the convex portion in the belt width direction of the belt tip portion is 0.04 to 0.15 mm, and the average height of the convex portion in the belt width direction of the bottom portion of the belt tooth. Is desirably 0.02 to 0.15 mm. This point will become clear in the examples described later,
When the average height of the convex portion in the belt width direction of the belt tooth tip is 0.04 mm or more, or the average height of the convex portion in the belt width direction of the belt tooth bottom is 0.02 mm or more, the impact due to the convex portion is caused. It is considered that the function of absorbing and forming the air passage by the concave portion is properly performed, and the noise during belt running can be effectively reduced. If the average height of the protrusions is greater than 0.15 mm at the tooth tip or the tooth bottom of the belt, the meshing of the belt teeth with the pulley groove becomes loose, which may hinder power transmission. Therefore, it is preferable that the distance be 0.15 mm or less. Here, the average height of the protrusion is defined by JIS
This concept is based on the center line average roughness (Ra) in B0601.

[0009] It is desirable that the convex portion is formed so that the cross-sectional area decreases toward the tip.
According to this configuration, the convex portion comes into contact with the pulley while being gradually compressed from the distal end, and the impact is further reduced, so that the impact noise is further reduced. In addition, a wide air passage formed by the concave portion is ensured, so that the air compression noise can be more effectively reduced.

The diameter of the concave portion in the belt width direction is preferably 0.2 to 1.0 times the diameter of the convex portion in the belt width direction. That is, when the diameter of the concave portion in the belt width direction is smaller than 0.2 times the diameter of the convex portion in the belt width direction, the passage of the air formed by the concave portion becomes narrow, and the air compression noise due to the escape of air is reduced. The reduction cannot be sufficiently achieved. Also, when it is larger than 1.0 times,
The ratio of the convex portion decreases, and plastic compression deformation occurs in the convex portion while the contact of the belt with the pulley is repeated, so that the impact absorbing effect of the convex portion decreases.

Furthermore, the coefficient of friction of the belt tooth surface is
Desirably, it is 0.3 or less. By setting the friction coefficient of the belt tooth side surface to 0.3 or less, the friction noise generated when the belt slides on the pulley surface is also reduced, and the noise source for the toothed belt is totally reduced. It will be reduced. Here, means for reducing the friction coefficient of the belt surface include, for example, addition of a lubricant to a matrix forming the belt body, application of silicone oil to the belt surface, elimination of soaking treatment on canvas, and increase in unevenness of the belt surface. To reduce the contact area with the pulley.

Another specific embodiment of the present invention relates to a specific construction of the toothed belt, in which a twill woven fabric formed by a warp extending in a belt length direction and a weft extending in a belt width direction is formed by the warp. In a toothed belt in which the belt tooth side surface is coated so that the ridges exposed are
The constituent denier of one of the warp yarn and the weft is 1.5 to 4.0 of the constituent denier of the other yarn.
It is characterized by being twice.

[0013] According to the above configuration, the canvas covering the belt tooth side surface has a denier number of one of the warp yarn and the weft yarn which is 1.5 times the denier number of the other yarn.
Since the ridges formed by the warp yarns are exposed on the belt surface, fine convex portions and concave portions are formed on the belt tooth side surface in the belt width direction. Are alternately formed. As a result, as described above, the impact noise and the air compression noise when the belt comes into contact with the pulley can be reduced. Here, the number of constituent denier of one yarn is 1.
If it is smaller than 5 times, the unevenness formed on the canvas surface will be small, and it will not be possible to sufficiently reduce noise. Further, when the number of deniers constituting the warp is greater than 4.0 times the number of deniers constituting the weft, the convex portion becomes large and the air passage formed by the concave portion becomes narrow,
Air compression noise cannot be sufficiently reduced. On the other hand, if the number of deniers of the weft is greater than 4.0 times the number of deniers of the warp, the concave portion becomes large and the convex portion undergoes plastic compression deformation, and the shock absorbing effect is reduced. Therefore, from the viewpoint of durability, it is preferable that the number of deniers constituting the warp is 1.5 to 4.0 times the number of deniers constituting the weft.

In this case, the specific configuration of the twill woven canvas is that the denier of the warp is 400 to 800 de.
And the denier of the weft is 200 to 300 de. That is, under the condition that the constituent denier of the warp is 1.5 to 4.0 times the constituent denier of the weft, according to the twill woven fabric formed by the warp and the weft selected in each of these ranges, actually, Impact noise and air compression noise can be reduced.

It is preferable that the warp yarn is a twisted yarn.
According to such a configuration, since the cross section of the warp is substantially circular, the cross-sectional area of the convex portion becomes smaller toward the tip. Therefore, the convex portion comes into contact with the pulley while being gradually compressed from the front end, and the impact is further reduced, so that the impact sound is further reduced. In addition, a wide air passage formed by the concave portion is ensured, so that the air compression noise can be more effectively reduced.

Further, the exposed length of the weft in the belt width direction is preferably 0.2 to 1.0 times the exposed length of the warp in the belt width direction. That is, if the exposed length of the weft yarn in the belt width direction is smaller than 0.2 times the exposed length of the warp yarn in the belt width direction, the air passage by the concave portion formed by the weft yarn portion becomes narrow, and the air escapes. As a result, air compression noise cannot be sufficiently reduced. On the other hand, when it is larger than 1.0 times, the ratio of exposure of the warp decreases, and plastic compression deformation occurs in the convex portion formed by the warp during repeated contact of the belt with the pulley. The effect will be reduced.

It is desirable that the twill woven canvas is one in which the adhesive treatment with rubber glue is performed only for the coating treatment for adhesion to the belt body. That is, by not soaking the canvas with rubber glue,
The amount of rubber adhering to the side of the canvas exposed on the belt surface is reduced, the friction coefficient of the belt surface is suppressed to a low level, and the friction noise generated by the belt rubbing against the pulley is reduced. On the other hand, the coating treatment ensures the adhesiveness to the belt body.

However, the twill woven fabric is treated by dipping in a resorcinol-formalin aqueous solution, a resorcinol-formalin latex (hereinafter referred to as "RFL") aqueous solution or a solution containing an epoxy compound, and heating and drying. There may be. By performing such a treatment, the ability of the canvas to adhere to the belt body is imparted.

[0019]

As described above, according to the invention of the present application, on the belt tooth side surface, fine convex portions and concave portions are alternately arranged in the belt width direction and concave portions are formed in the belt length direction. Since it is composed of uneven surfaces communicating with each other, when the belt comes into contact with the pulley, each convex portion elastically deforms to absorb the impact, and the belt teeth hit the pulley. The impact noise caused by the
Further, the air existing between the belt and the pulley is released by the passage formed by the concavities, and the air compression noise generated when the air is compressed in the closed space is also reduced.

[0020]

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

FIG. 1 shows a toothed belt B according to an embodiment of the present invention. FIG. 2 shows a twill fabric canvas surface.

In the toothed belt B, a belt main body is formed by a belt tooth portion 11 provided on the inner peripheral surface of the belt at a predetermined pitch in the belt length direction and a belt rear surface portion 12 on the outer peripheral surface side of the belt. Between the belt teeth 11 and the belt rear surface 12, a core wire 13 as a tension member is provided in a spiral shape extending substantially in the belt length direction and forming a pitch in the belt width direction. . The belt inner peripheral surface on the side of the belt teeth 11 is covered with canvas 14.

The belt teeth 11 and the belt back 12 are
It is formed of a rubber composition containing chloroprene rubber or the like as a main rubber.

The core wire 13 is formed of a twisted yarn such as glass fiber or aramid fiber bonded by RFL.

The canvas 14 is a twill fabric having a 2/2 structure or the like.
In this twill fabric, the constituent denier of the warp extending in the belt length direction is 1.5 to 4.0 times the constituent denier of the weft extending in the belt width direction, and the warp has a thickness of 40.
Twisted yarns such as 6,6-nylon fibers of 0 to 800 de and wefts are formed of twisted yarns of 6,6-nylon fibers of 200 to 300 de thickness. The ridges formed on the surface of the canvas 14 by the warp are exposed on the belt surface. Therefore, the surface of the belt teeth 11 side is formed by the convex portion formed by the warp and the exposed portion of the weft. The concavities and convexities are arranged so as to be alternately arranged in the belt width direction. The projection has a shape in which the cross-sectional area becomes narrower toward the tip, and the average height is 0.04 to 0.15 mm. The diameter of the concave portion in the belt width direction is equal to the diameter of the convex portion in the belt width direction.
2 to 1.0 times, the average height is 0.02
It is 0.15 mm.

FIG. 2 shows an example of the canvas 14 having a thickness of 42 cm.
0de 6,6-nylon fiber is used as warp 21 and thickness 2
6 / nylon fiber of 10de is used as the weft yarn 22.
2 shows a twill fabric canvas of two configurations. The warp 21 forms a ridge on the canvas surface from the upper left to the lower right in the figure. The warp yarns 21 and the weft yarns 22 are alternately exposed in the belt width direction. A convex portion is formed on the canvas surface by the bulky warp yarns 21, and a concave portion is formed by the weft yarn 22 portion. Further, since the twill structure is 2/2, the diameter of the convex portion and the diameter of the concave portion in the belt width direction are substantially equal. That is, the ratio between the diameter of the convex portion and the diameter of the concave portion in the belt width direction, that is, the ratio of the warp yarn and the weft yarn exposed to the canvas surface is generally determined by the twill structure.

Next, a method of manufacturing the toothed belt B will be described. <Canvas preparation step> A false twist yarn consisting of a warp yarn made of 6,6-nylon fiber or the like having a thickness of 400 to 800 de and an elastic yarn made of urethane fiber or the like, and a 6,6 yarn having a thickness of 200 to 300 de.
2/2 formed by a weft of nylon fibers
Is immersed in an RFL solution and heated and dried, and then the surface on which the ridge formed by the warp is not formed is coated with a rubber paste. Then, a twill woven fabric is formed into a cylindrical shape so that the coated rubber is on the outside and the weft is arranged to extend in the axial direction. The reason why the false twist yarn was used is that the elasticity of the canvas is required in the press-fit molding described later, and after vulcanization molding, the elastic yarn thermally deteriorates and loses its significance as an essential component of the belt. Is what you do. <Material setting step> A cylindrical mold in which grooves extending in the axial direction on the peripheral surface are provided at equal pitches in the peripheral direction is covered with the canvas.
Then, from above, a core wire made of glass fiber or the like bonded by RFL is spirally wound at an equal pitch. Further, an unvulcanized rubber composition sheet formed of chloroprene rubber or the like is wound thereon. At this time, the canvas, the core wire, and the rubber are set in layers on the peripheral surface of the cylindrical mold in this order from the mold side. <Vulcanization molding step> A cylindrical mold in which the materials are set is placed in a vulcanization can and a predetermined temperature and pressure are applied. At this time, the unvulcanized rubber composition flows and is pressed into the groove provided in the cylindrical mold so as to press the canvas, thereby forming a belt tooth portion. <Width cutting process> From the cylindrical mold removed from the vulcanizing can,
The cylindrical belt precursor formed on the peripheral surface is released from the mold, and is cut into a predetermined width to obtain the toothed belt B.

In the toothed belt B having the above structure, the canvas 14 covering the surface of the belt teeth 11 is made of a twill fabric having a 2/2 structure or the like. This twill fabric has a warp structure extending in the belt length direction. The denier is 1.5 to 4.0 times the number of deniers constituting the weft extending in the belt width direction, and the warp has a thickness of 400 to 800 de 6,6-nylon fiber or the like, and the weft has a thickness of It has a configuration of 200-300 de 6,6-nylon fiber or the like. Further, the ridge formed by the warp is exposed on the belt surface.
Therefore, on the surface of the belt teeth 11 side, fine convex portions formed by warp yarns and fine concave portions formed by weft yarns are alternately arranged in the belt width direction, and the concave portions communicate with each other in the belt length direction. It will be composed of a rough surface. Accordingly, when the belt comes into contact with the pulley, each convex portion is elastically deformed and absorbs an impact, so that the impact sound generated when the belt teeth hit the pulley is reduced. In addition, since the air existing between the belt and the pulley is released by the passage formed by the concavities, the air compression noise generated by the air being compressed in the closed space is also reduced. The Rukoto.

The average height of the convex portions in the belt width direction of the belt tooth tip is 0.04 to 0.15 mm,
Since the average height of the convex portion in the belt width direction of the belt tooth bottom is 0.02 to 0.15 mm, the effects of absorbing the impact by the convex portion and forming the air passage by the concave portion are properly performed. The noise during the running of the belt is reliably reduced, and the meshing of the belt teeth 11 with the pulley groove is not sufficient, so that the transmission of power is not hindered.

Since the warp is made of twisted yarn, the convex part formed by the warp is formed so that the cross-sectional area becomes smaller toward the front end. , And the impact is further reduced, so that the impact sound is further reduced. In addition, a wide air passage formed by the concave portion is ensured, so that the air compression noise can be more effectively reduced.

The exposed length of the weft yarn in the belt width direction is 0.2 to 1.0 times the exposed length of the warp yarn in the belt width direction, that is, the diameter of the concave portion in the belt width direction is larger than that of the convex portion in the belt width direction. Is 0.2 to 1.0 times as large as the diameter of the air compressor, so that the air passage formed by the concave portion is sufficiently ensured, the air compression noise is reliably reduced, and the air is compressed repeatedly. It is possible to prevent the impact absorbing effect from being reduced due to the plastic compressive deformation of the projection.

Further, since the canvas 14 has been subjected to a process of dipping in an RFL solution, heating and drying, and a coating process of a glue rubber, the canvas 14 has high adhesiveness to the belt body. In addition, since the soaking process with the adhesive rubber is not performed, the amount of rubber existing on the surface of the canvas 14 is small, and the friction coefficient of the belt surface is 0.3 or less. Accordingly, the friction noise generated by the friction of the belt with the pulley is also reduced, and the noise during the running of the belt is reduced as a whole. (Other Embodiments) In the above embodiment, the canvas is bonded by dipping in an RFL solution and heating.
It may be subjected to immersion in an F solution or a solution containing an epoxy compound and heat treatment. In this case, the amount of rubber adhering to the surface of the canvas is further reduced, so that the frictional noise generated when the belt slides on the pulley is further reduced.

In the above embodiment, the number of deniers constituting the warp is set to 1.5 to 4.0 times the number of deniers constituting the weft, but the number of deniers constituting the weft is 1.5 to 4.0 times the number of deniers constituting the warp. It may be configured to be 4.0 times.

[0034]

EXAMPLES <Preparation of Test Evaluation Sample Belts> Sample belts according to the following examples were prepared. The created sample belt had a belt tooth pitch of 8 mm, a belt width of 300 mm, and a circumference of 840 mm. -Example 1-As a canvas covering the surface of the toothed belt on the tooth side of the belt,
420 de 6,6-nylon fiber (Leona 6,6
Asahi Kasei Co., Ltd.) is a warp yarn that is twisted 20 times per 10 cm into a warp yarn extending in the belt length direction.
A twill fabric having a 2/2 configuration was used in which a twisted yarn obtained by twisting 6,6-nylon fiber e (produced by Leona 6,6 Asahi Kasei Corporation) 20 times per 10 cm into a weft extending in the belt width direction was used. Further, the canvas was subjected to an immersion in an RFL solution and a heat treatment, and then subjected to an adhesive treatment for coating a rubber paste on a belt side surface. The twill fabric was used such that ridges formed by warp yarns were exposed on the belt surface.

A rubber composition mainly composed of chloroprene rubber is used as the rubber composition for forming the belt body, and the core wire embedded in the belt body has a filament diameter of 7 μm which has been subjected to an adhesive treatment by RFL. 3/1
Three configurations of glass fiber cores were used.

Embodiment 1 A toothed belt having the above configuration is used in Embodiment 1.
And Eight belts were created. Example 2 Example 1 was repeated except that a canvas was used after immersion in an RFL solution and heat treatment, followed by soaking treatment on rubber paste and coating treatment on the belt side surface with rubber paste. Example 2 was a toothed belt having the same configuration as that of Example 2. Four belts were made. Example 3 A toothed belt having the same configuration as that of Example 1 except that the canvas was not subjected to an adhesive treatment by RFL, but was subjected to an adhesive treatment by immersion in an aqueous solution containing an epoxy resin compound and heat treatment. Was set to Example 3. Two belts were created. -Comparative Example- 6,6-nylon fiber having a thickness of 280 de (Promilan
Toray Co., Ltd.) is a warp extending in the belt length direction and has a thickness of 2
A 10/2, 6-nylon fiber (manufactured by Promiran Toray Co., Ltd.) was twisted 40 times per 10 cm, and a twill woven fabric having a 2/2 configuration in which weft yarns were formed as weft yarns extending in the belt width direction was used as canvas. The same configuration as in Example 1 except that the twill woven canvas was immersed in an RFL solution and heated, and then subjected to a soaking process on rubber paste and a coating process on the belt side surface with rubber paste. Was used as a comparative example. Three belts were made. <Test evaluation method>-Average height of convex portions and state of unevenness of belt surface-The belt tip and bottom of all toothed belts according to each example are scanned in the belt width direction by a contracer, and JI is performed.
The average height of the projections was determined according to the center line average roughness (Ra) in SB0601. In addition, the irregularities at the tooth tips of the toothed belts of Example 1 and Comparative Example were enlarged and traced. -Friction Coefficient- The friction coefficient at the tooth tips of all the toothed belts according to each example was measured by the friction coefficient measuring device shown in FIG.
That is, the test piece 31 obtained by cutting out a part of the belt
Was bonded and fixed to the test piece fixture 32 with the belt teeth facing downward. Next, the weight 34 was placed on the test piece attachment 32 such that the belt tip of the test piece 31 was pressed against the sliding plate 33. Subsequently, by moving the sliding plate 33, the tip of the belt is moved to the sliding plate 3.
The resistance load was detected in the load cell 35 which was slid on the three surfaces and connected to the test piece fixture 32. And
Friction coefficient was calculated by dividing the resistance load by the weight of the weight 34. The measurement of the friction coefficient was performed after the belt running test. As shown in FIG. 4, the belt running tester for noise measurement includes a driving pulley 41 having 24 teeth, a driven pulley 42 having the same configuration as the driving pulley 41, and 300 mm above the driving pulley 41. And a collected sound collecting microphone 43. The toothed belt 44 according to each example to be evaluated was wound around both pulleys 41 and 42 of the tester, and the driven pulley 42 was set in a state where a constant load was applied and no load torque was applied. Then, the rotation speed of the driving pulley 41 was varied in the range of 300 to 5000 rpm, and the noise at that time was measured. The belt running test was performed in a room temperature (25 ° C.) temperature atmosphere. <Test Evaluation Results>-Belt Surface Roughness-FIG. 5 shows an enlarged trace of the belt surface of Example 1 and FIG. 6 shows a comparative example of the belt surface.

In Example 1, a twill woven canvas formed by a warp yarn of a nylon thread having a thickness of 420 de and a weft yarn of a nylon yarn having a thickness of 210 de is used.
The warp forms a large ridge on the belt surface. Therefore, on the belt surface, the convex portions and the concave portions are alternately arranged in the belt width direction, and this point can be confirmed from FIG. According to this, the height difference between the convex portion and the concave portion is about 0.08 mm.

In the comparative example, a twill woven fabric formed by a warp yarn of a nylon yarn having a thickness of 280 de and a weft yarn of a nylon yarn having a thickness of 210 de is used, so that the belt surface has a substantially flat surface. This point can be confirmed from FIG. —Relationship Between Friction Coefficient and Noise— FIG. 7 shows the relationship between the friction coefficient of the belt tip and the noise during belt running. According to this, it can be confirmed that noise tends to decrease as the friction coefficient decreases. Specifically, in Example 1 in which the canvas was not subjected to a soaking treatment with rubber glue, or in Example 3 in which the canvas was subjected to an adhesive treatment with an aqueous solution containing an epoxy compound, the friction coefficient of the belt surface was 0.3 or less. The noise levels are generally lower than those of the comparative example and the second embodiment. It is considered that this is because the frictional noise between the belt and the pulley was suppressed low because the friction coefficient was low. -Relationship between Average Height of Convex Portion and Noise-FIG. 8 shows a relationship between the average height of the convex portion in the belt width direction of the belt tip of the belt and the noise during belt running, and FIG.
4 shows a relationship between an average height of a convex portion in a belt width direction of a belt tooth bottom portion and noise during belt running. According to these,
It can be confirmed that the noise tends to decrease as the average height of the projections increases. Specifically, Examples 1 to 3
In this case, the average height of the convex portion of the belt tooth tip is 0.04 mm or more, and the average height of the convex portion of the belt tooth bottom is 0.04 mm.
2 mm or more, so that the noise during belt running is lower than that of the comparative example. this is,
It is considered that the effect of absorbing the impact by the convex portion and the formation of the air passage by the concave portion is properly performed, thereby reducing the noise during running of the belt.

[Brief description of the drawings]

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

FIG. 2 is a front view of a twill fabric canvas.

FIG. 3 is an explanatory diagram showing a configuration of a friction coefficient measuring device.

FIG. 4 is a layout diagram of a belt running tester for noise measurement.

FIG. 5 is an enlarged trace of irregularities on the surface of the tip of the belt of Example 1.

FIG. 6 is an enlarged trace of irregularities on the surface of the tip of the belt of the comparative example.

FIG. 7 is a graph showing the relationship between the friction coefficient of the belt tip and noise.

FIG. 8 is a graph showing a relationship between an average height of a convex portion of a belt tip and noise.

FIG. 9 is a graph showing a relationship between an average height of a convex portion at the bottom of the belt and noise.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Belt tooth part 12 Belt back part 13 Core wire 14 Canvas 21 Warp 22 Weft 31 Test piece 32 Test piece fixture 33 Sliding plate 34 Weight 35 Load cell 41 Drive pulley 42 Follower pulley 43 Sound collecting microphone 44 Toothed belt

Claims (13)

[Claims] 1. A belt-shaped tooth side surface has a fine convex portion which elastically deforms and absorbs an impact at the time of contact with a pulley, and air which is held between the pulley at the time of contact with the pulley. Fine recesses forming a passage are alternately arranged in the belt width direction, and the recesses in the belt width direction are constituted by uneven surfaces formed so as to communicate with each other in the belt length direction. Toothed belt. 2. The toothed belt according to claim 1, wherein an average height of the protruding portions in a belt width direction of the belt tip portion is 0.04 to 0.15 mm. 3. An average height of a convex portion in a belt width direction of a bottom portion of a belt tooth located between adjacent belt tooth portions is 0.3.
The toothed belt according to claim 1 or 2, wherein the thickness is from 02 to 0.15 mm. 4. The toothed belt according to claim 1, wherein the convex portion is formed so that a cross-sectional area decreases toward a tip end. 5. The method according to claim 1, wherein the diameter of the concave portion in the belt width direction is 0.2 to 1.0 times the diameter of the convex portion in the belt width direction. A toothed belt according to item 1. 6. The toothed belt according to claim 1, wherein a friction coefficient of a surface of the tooth side of the belt is 0.3 or less. 7. A twill woven fabric formed by a warp extending in a belt length direction and a weft extending in a belt width direction covers a belt tooth portion side surface such that a ridge formed by the warp is exposed. In the toothed belt, the constituent denier of one of the warp yarn and the weft is 1.5 to 4.0 of the constituent denier of the other yarn.
A toothed belt characterized in that it is doubled. 8. The toothed belt according to claim 7, wherein the constituent denier of the warp yarn is 1.5 to 4.0 times the constituent denier of the weft yarn. 9. The toothed belt according to claim 8, wherein the warp has a configuration of 400 to 800 de, and the weft has a configuration of 200 to 300 de. 10. The toothed belt according to claim 7, wherein the warp yarn is a twisted yarn. 11. The exposed length of the weft in the belt width direction is 0.2 to 1.1 times the exposed length of the warp in the belt width direction.
The toothed belt according to any one of claims 7 to 10, wherein the ratio is zero. 12. The twill woven fabric according to claim 7, wherein only a coating process for bonding to the belt body is performed as a bonding process using rubber glue. A toothed belt according to item 1. 13. The twill woven fabric is subjected to an adhesive treatment of immersing in a resorcinol-formalin aqueous solution, a resorcinol-formalin latex aqueous solution or a solution containing an epoxy compound and heating and drying. The toothed belt according to any one of claims 7 to 12, wherein: