JP2005133873A - Timing belt which makes it possible to forecast life and system of forecasting life - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply a timing belt which a user can forecast to break in near future as well as a system of forecasting life of the timing belt. <P>SOLUTION: An abnormal sound producing member 16 embedded in the timing belt 10 causes toothed cloth 14 to wear and the abnormal sound to arise by coming into contact with a pulley tooth 28 when it exposes on belt surface due to occurrence of crack or the like. The wear and crack on surface of the timing belt 10 cause failure of lost tooth and cutting, etc. of the timing belt 10 in near future. Consequently, the user can forecast failure of the timing belt 10 induced from some cause by reporting to the user by means of detecting the abnormal sound from the timing belt 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a timing belt used in automobile engines, general industrial power transmission devices, and the like.

  In a timing belt used for power transmission of an automobile or a general industrial power transmission device, wear or crack of a tooth cloth or the like is caused by long-term use. When wear and cracks progress, the transmission of power is hindered by chipping or breaking, so that the timing belt used for a certain period needs to be replaced. In order to notify the user when this replacement is necessary, a method for predicting the belt life is known (for example, Patent Document 1).

On the other hand, in order to prolong the life of the timing belt, the timing belt (for example, Patent Document 2) having improved wear resistance and heat resistance by protecting the surface of the tooth portion with metal fibers, and a manufacturing method thereof (for example, patent) Reference 3) has been published.
Japanese Patent Laid-Open No. 11-247951 (FIG. 3) JP2003-130138A (FIG. 1) Japanese Patent Laying-Open No. 2003-191345 (FIG. 1)

  Even if the tooth surface of the timing belt is protected to improve durability, the belt may be chipped or cut due to surface wear or cracks after long-term use. In this case, the timing belt may break suddenly without warning to the user such as abnormal noise, unlike a chain that generally generates abnormal noise for a while before breaking. Therefore, for the user, an unexpected problem such as sudden repair being required may occur.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a timing belt and a timing belt life prediction system that allow a user to predict that a failure will occur due to missing teeth in the near future.

  A first timing belt according to the present invention includes a tooth rubber that forms a tooth portion and a tooth cloth that covers the surface of the tooth portion, and a thin-layered noise generating member between the tooth rubber and the tooth cloth. It has. When the noise generating member is exposed on the surface of the timing belt due to wear of the tooth cloth, the noise generating member generates noise due to contact with the pulley.

  It is preferable that the first timing belt further includes an adhesive layer formed of rubber containing an organometallic salt between the tooth rubber and the tooth cloth. Moreover, in order to improve adhesiveness with a tooth rubber and a tooth cloth, it is desirable that the abnormal sound generating member is subjected to an adhesive treatment with a rubber containing an organic metal salt.

  In order to more effectively improve the adhesion between the noise generating member and the tooth rubber and the noise generating member and the tooth cloth by the adhesive layer, the noise generating member is preferably in a mesh shape. Further, when the timing belt does not have an adhesive layer, and when the abnormal sound generating member is not subjected to an adhesive treatment with rubber containing an organometallic salt, the abnormal sound generating member and the tooth rubber, and the abnormal sound generating member, In order to adhere the tooth cloth, the tooth rubber preferably contains an adhesive component mainly composed of rubber containing an organic metal salt.

  The second timing belt of the present invention includes a tooth rubber that forms a tooth part and a tooth cloth that covers the surface of the tooth part, and the tooth rubber is in contact with the tooth cloth that covers the tooth bottom part of the tooth part. A cord-like abnormal sound generating member is embedded in the inner wall. When the abnormal noise generating member is exposed on the surface of the timing belt due to wear of the tooth cloth or tooth rubber, abnormal noise is generated due to contact with the pulley.

  In order to improve the adhesiveness between the second timing belt and the tooth rubber and the tooth cloth, it is desirable that the abnormal sound generating member is subjected to an adhesive treatment with a rubber containing an organic metal salt. The abnormal sound generating member is made of metal, for example.

  When the noise generating member is not bonded with rubber containing an organic metal salt, the tooth rubber is bonded mainly with rubber containing an organic metal salt in order to bond the noise generating member and the tooth rubber. It is preferable to include a component.

  The second timing belt further includes a core wire embedded along the longitudinal direction so as to contact the noise generation member, and the noise generation member is longitudinal in a direction different from the direction in which the core wire is embedded. It is preferable that it is embed | buried along.

  In the first timing belt manufacturing method of the present invention, the tooth cloth covering the surface of the tooth portion, the thin-layered abnormal sound generating member, and the adhesive layer are formed on the cylindrical outer peripheral surface at a predetermined pitch. To form a tooth cloth molded body by pre-molding it into a corrugated shape integrally and continuously on the surface of a pre-formed drum provided with a groove, and forming a tooth part according to the shape of the tooth cloth molded body This is provided with a pre-molding step in which the tooth rubber is continuously pressed and integrated with the tooth cloth molding to obtain a tooth rubber integrated product. Further, the tooth rubber integrated product is cut into a predetermined length and the cutting edges are brought into contact with each other to make an endless shape, and the endless tooth rubber integrated product is formed at a predetermined pitch on the cylindrical outer peripheral surface. Is attached to a molding die provided with a core wire wrapped around the outer periphery of the integrated tooth rubber, and a back rubber material as a material for the back rubber layer is laminated to form a timing belt intermediate. A vulcanization process is performed in which a timing belt slab is formed by performing a vulcanization process.

  In the second timing belt manufacturing method of the present invention, a tooth cloth is attached to a molding die in which tooth grooves are provided at a predetermined pitch on a cylindrical outer peripheral surface, and a cord-like abnormal noise generating member is attached to the molding belt. 1 is spirally wound around the outer periphery of the tooth cloth along the direction 1, and the cord is wound spirally along the second direction at an angle different from the first direction on the noise generating member. After the tooth rubber material is attached so as to cover the core wire, vulcanization is performed. In this case, the first direction is a direction having a predetermined angle with respect to the surface perpendicular to the central axis of the molding die, and the second direction is relative to the surface perpendicular to the central axis of the molding die. And a direction having an angle smaller than a predetermined angle.

  In the timing belt life prediction system of the present invention, a timing belt in which a noise generating member is embedded between a tooth rubber and a tooth cloth and / or in a tooth rubber is used by being wound around a pulley. And the sound from a timing belt is detected using a sound sensor. The timing belt life prediction system includes an abnormal sound judging means for judging that the sound detected by the sound sensor is higher than a predetermined sound pressure, and that the sound from the timing belt is determined to be abnormal. If this happens, the user is warned that the timing belt cannot be used in the near future, and the timing belt needs to be replaced.

  According to the present invention, it is possible to obtain a timing belt and a timing belt life prediction system for informing a user that they cannot use in the near future.

  Hereinafter, an embodiment of a timing belt in the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a timing belt according to the first embodiment.

  The timing belt 10 includes a tooth rubber layer 12 forming a tooth portion and a tooth cloth 14 for protecting the tooth rubber layer 12. Between the tooth rubber layer 12 and the tooth cloth 14, a thin-layered abnormal sound generating member 16, a first adhesive rubber layer 18 for bonding the abnormal sound generating member 16, and a second adhesive rubber layer 20. And are provided. Further, the timing belt 10 is provided with a back rubber layer 22, and a core wire 24 is embedded between the tooth rubber layer 12 and the back rubber layer 22.

  Both the tooth rubber layer 12 and the back rubber layer 22 are formed of hydrogenated nitrile rubber (hereinafter referred to as H-NBR). However, the tooth rubber layer 12 and the back rubber layer 22 may be formed of different materials. The material of the tooth cloth 14 is aramid fiber. The abnormal sound generating member 16 is made of mesh-like stainless steel (SUS304) and has a thickness of 0.084 mm. The noise generating member 16 is covered with the first and second adhesive rubber layers 18 and 20. The first and second adhesive rubber layers 18 and 20 are formed of H-NBR containing zinc methacrylate, which is an organic metal salt, a peroxide vulcanizing agent, and a sulfur vulcanizing agent. These components added to the H-NBR in order to enhance the adhesion between the noise generating member 16 and the tooth rubber layer 12 and the noise generating member 16 and the tooth cloth 14 may be contained in the tooth rubber layer 12. good.

  Since the noise generating member 16 has a mesh shape, the first adhesive rubber layer 18 and the second adhesive rubber layer 20 are not completely independent of each other, and a large number of wires (see FIG. (Not shown) are integral with each other. The core wire 24 is made of glass fiber.

  FIG. 2 is a cross-sectional view showing an example of the timing belt 10 that engages with a pulley and has been used for a long period of time. The tooth cloth 14 and the first adhesive rubber layer 18 are locally lost due to wear. ing.

  When the timing belt 10 and the metal pulley 26 are engaged, the noise generating member 16 may come into contact with the pulley teeth 28, and abnormal noise is generated by this contact. Further, when the stainless steel wire forming the mesh-like noise generating member 16 is broken by friction with the pulley teeth 28, the broken portion of the wire scratches the surface of the pulley teeth 28, so that a larger noise is generated. Occur. Even if the tooth cloth 14 and the first adhesive rubber layer 18 are not worn, if the noise generating member 16 is exposed on the surface of the timing belt 10 due to the generation of cracks, noise is also generated.

  When wear on the surface of the timing belt 10 progresses, the strength of the tooth portion decreases, which causes a failure such as missing teeth or cutting. Further, even when the noise generating member 16 is exposed on the surface of the timing belt 10 due to a cause other than wear, such as a crack, the timing belt 10 is likely to fail in the near future. In this embodiment, since abnormal noise is generated from the timing belt 10, it is possible to make the user predict a failure of the timing belt 10 due to some cause.

  Next, a method for manufacturing the timing belt 10 will be described. FIG. 3 is a diagram showing preforming. Since the noise generating member 16 is made of stainless steel and does not stretch, it is difficult to integrally mold the material of the tooth rubber layer 12 and the core wire 24 by pressurization and heating in the vulcanization process. Therefore, prior to the vulcanization step, the noise generating member 16 is continuously preformed into a corrugated shape together with the tooth cloth 14 and the adhesive rubber layer material 30 which is the material of the first and second adhesive rubber layers.

  The tooth cloth 14, the noise generating member 16, and the adhesive rubber layer material 30 are continuously fed onto the preforming drum 32 in a stacked state. The surface of the preforming drum 32 is provided with tooth spaces at a predetermined pitch. The preforming drum 32 rotates in the direction indicated by the arrow A. The toothed roller 34 rotates in the direction of arrow B while engaging with the pre-forming drum 32. For this reason, the laminated tooth cloth 14, the noise generating member 16, and the adhesive rubber layer material 30 move together with the pre-forming drum 32 in the direction indicated by the arrow A while the pre-forming drum 32 and the toothed roller 34 are moved. In the engaging area, the tooth part 36 of the pre-forming drum 32 and the tooth part 38 of the toothed roller 34 are integrally and continuously formed into a corrugated shape by the cooperative action, and a tooth cloth molding 42 is obtained. It becomes.

  FIG. 4 is a diagram showing a pressing process of the tooth rubber layer material.

  A plate-like tooth rubber layer material 44 is continuously supplied so as to cover the surface of the tooth cloth molding 42 on the preforming drum 32. Then, the tooth rubber layer material 44 pressed by the pressing member 40 moving in the direction indicated by the arrow C is deformed and integrated with the tooth cloth molded body 42 while becoming a shape close to the tooth rubber layer 12, and the tooth rubber. It becomes the integrated product 43, and the preforming process is completed.

  FIG. 5 is a view showing a timing belt intermediate.

  After the tooth rubber integrated product 43 is cut to a predetermined length, the cut edges are brought into contact with each other to become endless. The endless tooth rubber integrated product 43 is mounted on a molding die 46 provided with a recess 52 for forming a tooth portion of the timing belt 10. The core wire 24 is wound around the outer periphery of the tooth rubber layer material 44, and the back rubber material 48, which is the material of the back rubber layer 22, is further laminated on the core wire 24. Is formed.

  The timing belt intermediate 50 on the surface of the molding die 46 is pressurized in the direction of arrow D and heated at the same time (vulcanization step). As a result, among the components of the timing belt intermediate body 50, the tooth cloth molded body 42, the tooth rubber layer material 44 and the back rubber material 48 are mainly deformed, and the timing belt intermediate body 50 becomes the surface of the molding die 46. The molding is performed so as to be completely in contact with each other, that is, so as to form a slab of the timing belt 10.

  In the vulcanization process, a part of the adhesive rubber layer material 30 forming the tooth cloth molding 42 passes from the tooth rubber layer material 44 side through the gap between the mesh-like noise generating member 16 and the tooth cloth 14. To the side (see FIGS. 1 and 3). Then, the first adhesive rubber layer 18 is formed by the adhesive rubber layer material 30 that has flowed to the tooth cloth 14 side, and the second adhesive rubber layer 20 is formed by the adhesive rubber layer material 30 remaining on the tooth rubber layer 12 side ( (See FIGS. 1 and 3). The vulcanization process is based on a conventionally known technique except that the integrated tooth rubber 43 including the stainless noise generating member 16 is used.

  The timing belt slab 50 having the same cross-sectional shape as the timing belt 10 by the vulcanization process is cooled and then subjected to a polishing process on the back surface. And the timing belt 10 is manufactured by cut | disconnecting so that it may become a predetermined width | variety.

  Next, detection of generated abnormal noise will be described. FIG. 6 is a schematic diagram showing the timing belt life prediction system 55.

  The timing belt life prediction system 55 includes a microphone 56, a CPU 58, and a warning lamp 59. Sound generated from the timing belt 10 is detected by the microphone 56. The microphone 56 always detects sound from the timing belt 10 when the timing belt 10 is operated. The sound data detected by the microphone 56 is sent to the CPU 58.

  When the abnormal noise generating member 16 is exposed due to wear of the timing belt 10, a louder sound is generated in contact between the exposed abnormal noise generating member 16 and the pulley 26. This sound has a higher sound pressure than that generated when the timing belt 10 operates normally and there is no contact between the pulley 26 and the noise generating member 16. The CPU 58 is set in advance with an upper limit value of sound pressure for determining abnormal noise. When sound data having a sound pressure higher than the upper limit value is input, it is determined that the sound is abnormal. To do.

  When it is determined that the sound from the timing belt 10 is abnormal, a signal for turning on the warning lamp 59 is transmitted from the CPU 58 to the warning lamp 59. As a result, the warning lamp 59 is lit and the user is informed that the timing belt 10 needs to be replaced because the timing belt 10 will break in the near future.

  As described above, according to the first embodiment, the timing belt 10 including the noise generating member 16 between the tooth cloth 14 and the tooth rubber layer 12 is manufactured. Then, the timing belt life prediction system using the timing belt 10 allows the user to predict the necessity of breakage and replacement of the timing belt 10.

  When the noise generating member 16 is made of a material having good moldability, the timing belt 10 is manufactured by a general-purpose manufacturing method in which the noise generating member 16 is molded into a predetermined shape in the vulcanization process without performing pre-molding. May be manufactured.

  The thickness of the abnormal noise generating member is preferably 0.05 mm to 0.2 mm. If the thickness is less than 0.05 mm, which is the lower limit of this range, the abnormal noise generating member may be instantaneously cut due to wear on the belt surface or the like, and abnormal noise may not be generated. Further, when the thickness is larger than the upper limit of 0.2 mm, the formability at the time of manufacturing the timing belt may be lowered, or the flexibility of the belt after the belt is completed may be lowered.

  The abnormal sound generating member may be in the form of a sheet. In this case, unlike the present embodiment, the first and second adhesive rubber layers 18 and 20 need to be independent from each other from the pre-molding stage.

  Hereinafter, the second embodiment will be described. FIG. 7 is a cross-sectional view illustrating a timing belt according to the second embodiment.

  The timing belt 60 is provided with a tooth rubber layer 62 forming a tooth portion, a tooth cloth 64 for protecting the tooth rubber layer 62, and a back rubber layer 72. Further, a core wire 74 is embedded between the tooth rubber layer 62 and the back rubber layer 72. The materials of these members are the same as the corresponding members of the timing belt 10, respectively, but may be formed of different materials.

  The timing belt 60 includes a mesh-like abnormal noise generating member 16 provided in the timing belt 10 of the first embodiment, a first adhesive rubber layer 18 for bonding the abnormal noise generating member 16, and a second adhesive. A member corresponding to the rubber layer 20 is not provided. However, an abnormal sound generating member 76 that is a stainless steel cord is embedded so as to be in contact with the tooth bottom portion 75 of the tooth rubber layer 62. For this reason, when the noise generating member 76 is exposed on the surface of the timing belt 60 due to the wear of the tooth cloth 64, cracks, or the like, the noise is generated due to contact with the pulley as with the timing belt 10. Therefore, the user can predict the life of the timing belt 10.

  In addition to the main component H-NBR, in addition to the main component H-NBR, the tooth rubber layer 62 includes zinc methacrylate, which is an organic metal salt, and peroxide in order to improve the adhesion between the noise generating member 76 and the tooth rubber layer 62. -Based vulcanizing agent and sulfur-based vulcanizing agent are included.

  Next, a method for manufacturing the timing belt 60 will be described. FIG. 8 is a cross-sectional view illustrating the vulcanization process of the timing belt 60.

  In manufacturing the timing belt 60, as shown in FIG. 8A, first, the tooth cloth 64 is mounted on a molding die 82 having a tooth gap structure with a predetermined pitch. Then, the cord-like abnormal sound generating member 76 and the core wire 74 are wound around the outer peripheral portion of the tooth cloth 64 at predetermined intervals in this order. Then, a plate-like rubber material 80 for forming the tooth rubber layer 62 and the back rubber layer 72 is laminated on the core wire 74. Thereafter, pressure and heating are performed in the direction of arrow E from the rubber material 80 side (vulcanization step).

  When the tooth rubber layer 62 does not contain an organic metal salt, a peroxide-based vulcanizing agent, or a sulfur-based vulcanizing agent, the abnormal sound generating member 76 adheres to the tooth cloth 64 or the tooth rubber layer 62. In order to increase the thickness, it is preferable that a surface treatment is performed in advance with an adhesive containing an organic metal salt, zinc methacrylate, and a thin adhesive metal layer (not shown) containing an organic metal salt is formed on the surface. .

  When the vulcanization process proceeds, the softened rubber material 80 flows from the gap between the core wire 74 and the abnormal sound generating member 76 toward the surface of the molding die 82 as shown in FIG. 8B. Finally, as shown in FIG. 8C, the rubber material 80 pressed against the surface of the molding die 82 is used to form a tooth rubber layer 62 having teeth of a predetermined shape, a back rubber layer 72, Is formed. In addition, the core wire 74 and the abnormal sound generating member 76 are not easily deformed, and the shapes are constant before and after the vulcanization process shown in FIGS.

  FIG. 9 is a schematic view showing a process of winding the core wire 74 around the outer periphery of the tooth cloth 64 attached to the surface of the molding die 82 in the manufacture of the timing belt 60.

  In the manufacture of the timing belt 60, when the molding die 82 rotates in the direction indicated by the arrow F, the cord 74 continues to be wound around the cord-like noise generating member 76 around the outer periphery of the tooth cloth 64. The abnormal sound generating member 76 is spirally wound along a direction inclined by a predetermined angle with respect to a plane perpendicular to the central axis G of the molding die 82, that is, a horizontal plane. The core wire 74 is wound more densely on the abnormal sound generating member 76 wound earlier than the abnormal sound generating member 76 along a direction inclined at an angle smaller than the abnormal sound generating member 76 with respect to the horizontal plane. .

  FIG. 10 is an enlarged view of the core wire 74 and the abnormal sound generating member 76 wound around the outer periphery of the tooth cloth 64 as seen from the inside of the molding die 82 with the tooth cloth 64 removed from the tooth bottom part 75.

  An arrow H indicates a horizontal plane that is a plane perpendicular to the central axis G, and an arrow I indicates a direction in which the core wire 74 is wound. Since the core wire 74 is wound at a predetermined interval substantially along a horizontal plane, the inclination between the direction indicated by the arrow H and the direction indicated by the arrow I is very small. On the other hand, the abnormal sound generating member 76 is also wound at a constant interval along the direction indicated by the arrow J and inclined by the angle α with respect to the horizontal plane. An abnormal sound generating member interval 76D, which is an interval at which the abnormal sound generating member 76 is arranged, is wider than a core wire interval 74D, which is an arrangement interval of the core wires 74. Thus, the core wire 74 and the abnormal sound generating member 76 are wound on the tooth cloth 64 along different directions at the time of manufacture, and the number of the wound around the unit width of the tooth cloth 64 is the abnormal sound generating member 76. Is less than the core 74.

  As a result of the arrangement of the core wire 74 and the abnormal sound generating member 76, even if the load from the pulley 26 is received during the operation of the timing belt 60, the abnormal sound generating member 76 is a core wire that is a gap between the core wires 74. It maintains between the layer which consists of the core wire 74, and the tooth rubber layer 62, without displacing to the space | interval 74D.

  The tooth rubber abnormal noise generating member 76 is for generating abnormal noise in contact with the pulley 26 when exposed to the surface due to wear or the like due to use of the timing belt 60, and is wound as tightly as the core wire 74. Since it is not necessary, the noise generating member interval 76D is wider than the core wire interval 74D, but may be changed as necessary.

  When the vulcanization process is finished after the core wire 74 and the abnormal sound generating member 76 are wound around the outer periphery of the tooth cloth 64, the vulcanized timing belt slab is moved along the horizontal plane of the molding die 82 indicated by the arrow H. The timing belt 60 is cut to a predetermined width. Accordingly, the core wire 76 is disposed substantially parallel to the longitudinal direction of the timing belt 60, and the noise generating member 76 is disposed along a direction inclined by an angle α with respect to the belt longitudinal direction. In addition, in the manufacturing method of the timing belt 60, it implements according to a conventionally well-known technique except the point which winds the cord-shaped abnormal sound generation | occurrence | production member 76 along the direction different from the core wire 74. FIG.

  FIG. 11 is a schematic view showing a state in which the tooth bottom portion of the timing belt 60 that has been used for a long period of time is worn and the noise generating member 76 is exposed on the surface.

  When the tooth bottom is worn by long-term use, the noise generating member 76 is exposed on the surface of the worn portion. The abnormal noise generating member 76 comes into contact with the metal pulley teeth 28 to generate abnormal noise. Although the load is applied to the exposed noise generating member 76 by contact with the pulley teeth 28, the core wire 74 arranged closer to the noise generating member 76 along a direction different from that of the noise generating member 76. Thus, the abnormal sound generating member 76 is prevented from being buried in the back rubber layer 72. In FIG. 11, the core wire 74 is shown in order to clarify the positional relationship between the noise generating member 76 and the core wire 74 in the timing belt 60, but the stainless steel abnormal noise generating member 76 is exposed. Then, an abnormal noise is generated and the use of the timing belt 60 is stopped. Therefore, the core wire 74 embedded under the abnormal noise generating member 76 is not exposed due to actual wear.

  The generated abnormal noise is detected by the timing belt life prediction system 55 as in the first embodiment, and the user can know in advance the failure of the timing belt 10.

  As described above, according to the second embodiment, the timing belt 60 including the noise generating member 76 that is in the tooth rubber layer 62 and is in contact with the tooth bottom 75 is manufactured. Since the timing belt 60 is used in the timing belt life prediction system of the present invention, the user can predict the necessity of breakage and replacement of the timing belt 60.

  The noise generating members 16 and 76 are made of a material having a lower hardness than the material forming the pulley 26 used together, and do not damage the surface of the pulley 26 even when the noise is generated.

It is sectional drawing which shows the timing belt of 1st Embodiment. It is sectional drawing which shows the timing belt of 1st Embodiment engaged with a pulley. It is a figure which shows preforming. It is a figure which shows the press process of a tooth rubber layer material. It is a figure which shows a timing belt intermediate body. It is the schematic which shows a timing belt lifetime prediction system. It is sectional drawing which shows the timing belt of 2nd Embodiment. It is a figure which shows the vulcanization | cure process in the timing belt manufacture of 2nd Embodiment. It is a figure which shows the winding process of the core wire in the timing belt manufacture of 2nd Embodiment. It is the enlarged view which looked at the core wire and the abnormal sound generation | occurrence | production member wound around the outer peripheral part of the tooth cloth from the inner side of the molding die by removing the tooth cloth in the tooth bottom part. In the timing belt of a 2nd embodiment, it is a schematic diagram showing the state where the abnormal sound generating member was exposed to the surface by wear.

Explanation of symbols

10, 60 Timing belt 12, 62 Tooth rubber layer (tooth rubber)
14, 64 Tooth cloth 16, 76 Abnormal sound generating member 18 First adhesive rubber layer (adhesive layer)
20 Second adhesive rubber layer (adhesive layer)
24, 74 Core wire 32 Pre-molded drum 42 Tooth fabric molded body 43 Integrated tooth rubber 50 Timing belt intermediate 55 Timing belt life prediction system 56 Microphone (sound sensor)
58 CPU (noise detection means)
59 Lamp (Warning means)

Claims (13)

Tooth rubber that forms the tooth part;
A tooth cloth covering the surface of the tooth part;
Between the tooth rubber and the tooth cloth, comprising a thin layer-like abnormal sound generating member,
The timing belt according to claim 1, wherein when the noise generating member is exposed on a surface of the timing belt due to wear of the tooth cloth, noise is generated by contact with a pulley.   The timing belt according to claim 1, further comprising an adhesive layer formed of rubber containing an organic metal salt between the tooth rubber and the tooth cloth.   The timing belt according to claim 1, wherein the noise generating member is subjected to an adhesion treatment with a rubber containing an organic metal salt.   The timing belt according to claim 1, wherein the noise generating member is made of mesh metal.   The timing belt according to claim 1, wherein the tooth rubber includes an adhesive component whose main component is rubber containing an organic metal salt. Tooth rubber that forms the tooth part;
A tooth cloth covering the surface of the tooth part;
A cord-like abnormal sound generating member embedded in the tooth rubber so as to be in contact with a tooth cloth covering a tooth bottom part of the tooth part;
The timing belt according to claim 1, wherein when the noise generating member is exposed on the surface of the timing belt due to wear of the tooth cloth, noise is generated by contact with a pulley.   The timing belt according to claim 6, wherein the noise generating member is subjected to adhesion treatment with rubber containing an organic metal salt.   The timing belt according to claim 6, wherein the noise generating member is made of metal.   The timing belt according to claim 6, wherein the tooth rubber includes an adhesive component whose main component is rubber containing an organic metal salt. A core wire embedded along the longitudinal direction so as to be in contact with the noise generating member;
The timing belt according to claim 6, wherein the noise generating member and the core wire are embedded along different directions so as to intersect with each other. The tooth cloth covering the surface of the tooth part, the thin-layered abnormal sound generating member and the adhesive layer are arranged on the surface of a pre-formed drum having a tooth pitch at a predetermined pitch on a cylindrical outer peripheral surface. And continuously pre-molded into a corrugated shape to form a tooth cloth molding,
According to the shape of the tooth cloth molding, a pre-molding step of continuously pressing the tooth rubber for forming the tooth portion and integrating with the tooth cloth molding to form a tooth rubber integrated product,
The tooth rubber integrated product is cut into a predetermined length and the cutting edges are brought into contact with each other to make an endless shape, and the endless tooth rubber integrated product is provided with a tooth groove at a predetermined pitch on a cylindrical outer peripheral surface. Is attached to the molded mold, wound around the outer periphery of the tooth rubber integrated product, and further laminated a back rubber material as a material of the back rubber layer to form a timing belt intermediate,
A timing belt manufacturing method comprising: a vulcanization step of vulcanizing the timing belt intermediate. A tooth cloth is attached to a molding die provided with tooth grooves at a predetermined pitch on a cylindrical outer peripheral surface, and a cord-like abnormal sound generating member is spiraled around the outer periphery of the tooth cloth along a first direction. Wrapped in a shape,
On the abnormal sound generating member, after winding the core wire spirally along a second direction different from the first direction, and further attaching a plate-like tooth rubber material so as to cover the core wire, A method of manufacturing a timing belt, characterized by performing a vulcanization treatment. A timing belt that generates noise by contact with the pulley when a noise generating member that is wound around the pulley and exposed between the tooth rubber and the tooth cloth and / or embedded in the tooth rubber is exposed due to surface wear. When,
A sound sensor for detecting sound from the timing belt;
Abnormal sound determining means for determining that the sound is abnormal when a sound having a sound pressure larger than a predetermined sound pressure is detected by the sound sensor;
A timing belt life prediction system comprising warning means for prompting a user to replace the timing belt when the sound is determined to be abnormal.

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