JP6430241B2 - Transmission belt manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a transmission belt (V-ribbed belt, cogged V-belt, toothed belt, etc.).

  For example, in the case of a V-ribbed belt, a transmission sleeve is manufactured by forming an annular sleeve including a compression layer, vulcanizing the sleeve, then grinding the compression layer of the sleeve to form a rib, and adjusting to the belt width. Cut the sleeves. Further, when ribs are formed by grinding, a material loss occurs. Therefore, in order to suppress material loss, a method of forming ribs without grinding is also known (for example, see Patent Document 1). Patent Document 1 uses an inner mold that can be expanded and contracted and an outer mold having a rib groove for forming a rib on the inner circumferential surface, and a first sleeve including a compression layer is attached to the outer circumferential surface of the inner mold, The inner mold is expanded and the first sleeve is pushed into the outer mold to form a rib. After that, the core and the stretched layer are formed on the outer peripheral surface of the inner mold with the first sleeve held by the outer mold. It is described that the second sleeve is formed, the inner mold is expanded, the second sleeve is integrated with the first sleeve, and vulcanization is performed.

Japanese Patent No. 4256204

  However, in the method described in Patent Document 1, since the core wire is extended when the second sleeve is integrated with the first sleeve, it is difficult to maintain the alignment of the core wires well. There may be restrictions on the material of the core wire, such as difficulty in using a material with a high elastic modulus. Further, in the method described in Patent Document 1, it is also conceivable to reduce the extension of the core wire when the second sleeve is integrated with the first sleeve by reducing the gap between the first sleeve and the second sleeve. . However, when the first sleeve is lifted from the outer mold, if the gap is small, the second sleeve comes into contact with the first sleeve when the second sleeve is formed, and rubbing or twisting between the sleeves occurs. obtain. Since the gap becomes smaller as the belt circumferential length becomes shorter, the above problem becomes more prominent as the belt circumferential length becomes shorter. Therefore, in the method described in Patent Document 1, the belt circumferential length may be restricted.

  An object of the present invention is to provide a transmission belt that can suppress loss of material, can maintain the alignment of the cores well, and is less likely to be restricted in the material of the cores and the belt circumference. It is in providing the manufacturing method of.

According to an aspect of the present invention, a compression layer having a plurality of convex portions extending in a belt longitudinal direction or a belt width direction on one surface, and the belt on the other surface opposite to the one surface in the compression layer. In a manufacturing method of a transmission belt including a core wire extending in a longitudinal direction, an annular sleeve including the compression layer is formed, and after the sleeve formation step, after the sleeve formation step, the compression layer in the sleeve Forming a plurality of convex portions on one surface; and a vulcanizing step of vulcanizing the sleeve after the convex portion forming step, wherein the sleeve includes the core wire. The sleeve forming step further includes a core wire disposing step of disposing the core wire on the other surface of the compressed layer so as to coincide with a pitch circumference during vulcanization in the vulcanization step , Convex part formation process The groove forming surface of the convex forming member having a groove forming surface in which a plurality of grooves corresponding to the plurality of convex portions are formed is pressed against the outer peripheral surface of the sleeve corresponding to the one surface of the compression layer. Thus, a method for manufacturing a transmission belt is provided.

  According to this invention, since it is the structure which forms a convex part irrespective of grinding, the loss of material can be suppressed. Moreover, since it is not the structure which extends a core wire when integrating a 2nd sleeve with a 1st sleeve like the method of patent document 1, the alignment state of a core wire can be hold | maintained favorably, and Restrictions are unlikely to occur in the material of the core wire and the belt circumference.

  The transmission belt further includes an extension layer sandwiching the core wire with the compression layer, the sleeve further includes the extension layer, and the sleeve forming step includes the extension of the core wire with the compression layer. You may further include the extending | stretching layer arrangement | positioning process of arrange | positioning the said extending | stretching layer so that it may pinch | interpose. In this case, the alignment state of the core wires can be more reliably and satisfactorily maintained by forming the convex portion in a state where the core wires are buried between the stretch layer and the compression layer.

  In the sleeve forming step, the sleeve is formed on the outer peripheral surface of a cylindrical drum so that the outer peripheral surface of the drum and the other surface of the compression layer are opposed to each other with the core wire in between. The convex portion forming step may be performed in a state where the sleeve is mounted on the outer peripheral surface of the drum. In this case, since the tool (drum) is used in common in the sleeve forming step and the convex portion forming step, it is not necessary to separately prepare a tool for forming the convex portion, and the manufacturing cost can be reduced and the work efficiency can be reduced. improves.

  The convex portion forming step may be performed while changing the pressing position of the groove forming surface with respect to the outer peripheral surface of the sleeve. In this case, the convex portion can be easily formed using a relatively small convex portion forming member.

  The convex portion forming member is an annular member in which an inner peripheral surface corresponding to the groove forming surface surrounds the outer peripheral surface of the sleeve, and the convex portion forming step includes the inner peripheral surface of the sleeve as the inner peripheral surface. You may carry out in the state surrounded by the surrounding surface. In this case, the convex portion can be easily formed.

  In the convex portion forming member, at least the groove portion is made of rubber, and the rubber may include short fibers oriented in the axial direction of the convex portion forming member corresponding to the belt width direction. In this case, shrinkage in the axial direction of the rubber is suppressed, and pitch deviation of the convex portion in the belt width direction can be prevented. Accordingly, the sleeve can be securely attached to the member to which the sleeve is attached in the vulcanization process, and as a result, the dimensional accuracy of the transmission belt to be manufactured can be improved. Further, since shrinkage with time in the axial direction of the rubber is also suppressed, the number of times the convex portion forming member can be used, which is judged from the viewpoint of dimensional accuracy, is increased, which is economical.

  The core wire may be composed of an aramid fiber. Aramid fiber has properties such as high strength and high elastic modulus (it is difficult to stretch), and the core wire is made of aramid fiber to realize reduction in thickness of transmission belt and reduction in bending rigidity. The transmission belt can be applied to a high load system. Further, although the aramid fiber is difficult to stretch due to its high elastic modulus, the present invention is not configured to stretch the core wire when the second sleeve is integrated with the first sleeve as in the method described in Patent Document 1. Aramid fibers can be suitably used as the wire material.

  The transmission belt has a coating layer made of a knitted fabric that covers the plurality of convex portions on the one surface, and the convex portion forming step includes the covering layer between the convex portion forming member and the compression layer. You may carry out by pressing the said groove formation surface of the said convex-part formation member on the said outer peripheral surface of the said sleeve in the state which interposed the layer. In this case, the coating layer improves air permeability and suppresses the remaining air, so that the air venting effect is improved (evacuation can be made unnecessary). In addition, the convex portion forming member can be easily peeled from the sleeve after the convex portion forming step. Furthermore, since the formation state of the convex portion is stabilized and the coefficient of friction on the surface of the convex portion is lowered, the mounting property of the sleeve to the member to which the sleeve is mounted in the vulcanization process is improved. In addition, stabilization of the surface characteristics (friction coefficient, etc.) of the belt can be realized.

  According to this invention, since it is the structure which forms a convex part irrespective of grinding, the loss of material can be suppressed. Moreover, since it is not the structure which extends a core wire when integrating a 2nd sleeve with a 1st sleeve like the method of patent document 1, the alignment state of a core wire can be hold | maintained favorably, and Restrictions are unlikely to occur in the material of the core wire and the belt circumference.

It is a flowchart which shows the manufacturing method of the power transmission belt which concerns on 1st Embodiment of this invention. It is a perspective view which shows the convex part formation apparatus used at the convex part formation process in the manufacturing method of the power transmission belt which concerns on 1st Embodiment of this invention. (A) is a top view which shows the condition where convex part formation is performed by the convex part formation apparatus shown in FIG. (B) is sectional drawing which followed the IIIB-IIIB line | wire of Fig.3 (a). FIG. 3C is an enlarged view of a region IIIC surrounded by a one-dot chain line in FIG. (A)-(c) is sectional drawing corresponding to the area | region IIIC enclosed with the dashed-dotted line of FIG.3 (b) which shows a convex part formation process in steps. (A)-(c) is sectional drawing corresponding to the area | region IIIC enclosed with the dashed-dotted line of FIG.3 (b) which shows a vulcanization process in steps. (A) is a top view which shows the condition where the convex part formation is performed by the convex part formation apparatus in the manufacturing method of the power transmission belt which concerns on 2nd Embodiment of this invention. (B) is sectional drawing which followed the VIB-VIB line | wire of Fig.6 (a). FIG. 6C is an enlarged view of a region VIC surrounded by a one-dot chain line in FIG. (A), (b) is a fragmentary sectional view which shows the preparation process of the convex part formation member used with the manufacturing method of the power transmission belt which concerns on 3rd Embodiment of this invention in steps. (C) is a perspective view which shows the convex part formation member used with the manufacturing method of the power transmission belt which concerns on 3rd Embodiment of this invention. It is a figure which shows the condition where the convex part formation is performed by the convex part formation apparatus in the manufacturing method of the power transmission belt which concerns on 3rd Embodiment of this invention, (a) is a partially notched perspective cross section of a convex part formation apparatus. FIG. 4B is a cross-sectional view corresponding to FIG. It is a figure which shows the condition where the convex part formation is performed by the convex part formation apparatus in the manufacturing method of the power transmission belt which concerns on 4th Embodiment of this invention, (a) is a partially notched perspective cross section of a convex part formation apparatus. FIG. 4B is a cross-sectional view corresponding to FIG. (A) is a table | surface which shows the manufacturing conditions and quality evaluation of the Example and comparative example of this invention. (B) is a table | surface which shows the composition of the rubber | gum for an extension layer, the rubber | gum for compression layers, and the rubber | gum for the adhesion process of a coating layer in the Example and comparative example of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  The manufacturing method according to the first embodiment of the present invention is a method for manufacturing a V-ribbed belt having a plurality of ribs (projections) extending in the longitudinal direction of the belt on one surface, as shown in FIG. The sleeve forming step S1, the convex portion forming step S2, and the vulcanizing step S3 are included.

  In the sleeve forming step S1, the annular sleeve 1 is formed using the drum 10 also used in the convex portion forming step S2.

  As shown in FIG. 2, the drum 10 is cylindrical and has a smooth outer peripheral surface 10 x without a groove. The drum 10 is formed by machining general structural rolled steel (SS400 or the like) or carbon steel (S45C, S55C or the like), and the outer peripheral surface 10x may be protected by hard chrome plating or the like.

  As shown in FIG. 4, the sleeve 1 includes a compression layer 1 a in which a plurality of protrusions 1 v are formed on one surface in the protrusion formation step S <b> 2, and the other surface opposite to the one surface in the compression layer 1 a. 2 includes a core wire 1b extending in the longitudinal direction of the belt, an extension layer 1c sandwiching the core wire 1b with the compression layer 1a, and a covering layer 1d covering the plurality of convex portions 1v. The compression layer 1a may be composed of a rubber composition containing a rubber component such as ethylene-propylene-diene rubber, millable urethane rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, styrene-butadiene rubber, natural rubber, or butyl rubber. The core wire 1b is composed of an aramid fiber. The stretch layer 1c is a rubber composition containing a rubber component such as ethylene-propylene-diene rubber, millable urethane rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, styrene-butadiene rubber, natural rubber, butyl rubber, and the like, similar to the compression layer 1a. And may be further fiber reinforced. The covering layer 1d is made of a knitted fabric, and may be knitted with, for example, a polyester composite yarn and a cellulose natural spun yarn (for example, cotton yarn).

  In the sleeve forming step S1, first, as shown in FIG. 4A, the outer peripheral surface 10x of the drum 10 is provided with a release paper 2 (for example, a silicone release agent coated on both sides of a base material made of paper or the like). The stretched layer 1c is wound thereon, and further the core wire 1b is further referred to as the circumferential direction of the drum 10 (hereinafter, simply referred to as “circumferential direction”. The “circumferential direction” is the belt longitudinal direction. And the compression layer 1a and the covering layer 1d are sequentially wound thereon to form the sleeve 1. In other words, in the sleeve forming step S1, the core wire placement step S1a for placing the core wire 1b on the other surface of the compression layer 1a and the stretch layer for placing the stretch layer 1c so as to sandwich the core wire 1b between the compression layer 1a Placement step S1b. At this time, the core wire 1b is disposed so as to coincide with the pitch circumference during vulcanization.

  In the convex portion forming step S2 performed after the sleeve forming step S1, the drum 10 is moved and incorporated in the convex portion forming apparatus 100 shown in FIGS. 2 and 3 while the sleeve 1 is mounted on the outer peripheral surface 10x of the drum 10. The plurality of convex portions 1v are formed on the outer peripheral surface 1x of the sleeve 1 (that is, one surface of the compression layer 1a in the sleeve 1) using the convex portion forming apparatus 100.

  The convex portion forming apparatus 100 includes a drum 10 that is also used in the sleeve forming step S <b> 1, a support portion 15 that supports the drum 10, a drive portion 16 that drives the support portion 15 to rotate while supporting the drum 10, and a plurality of portions. A convex portion forming member 20 having a groove forming surface 20x formed with a plurality of grooves 20v corresponding to the convex portion 1v, and a reaction force member 30 arranged to face the convex portion forming member 20 with the drum 10 interposed therebetween. A heater 40 that heats the convex portion forming member 20, a pressing means 50 disposed outside the convex portion forming member 20 and the reaction force member 30, a pair of frames 60 that support the pressing means 50, and each of the above configurations And a gantry 70 for supporting the element.

  The support portion 15 includes a disk-shaped base 11 that supports the lower surface of the drum 10, an upper shaft 12 that protrudes upward from the center portion of the upper surface of the base 11, and a lower shaft 13 that protrudes downward from the center portion of the lower surface of the base 11. including. The upper shaft 12 passes through a hole formed in the center of the lower wall of the drum 10 and is inserted into the drum 10. The lower shaft 13 passes through the gantry 70, and a drive unit 16 is provided at the lower end thereof. The base 11 and the lower shaft 13 are rotatably supported by the gantry 70 via a support roll 11a and a bearing 13a, respectively.

  The convex portion forming member 20 has substantially the same length as that of the drum 10 with respect to the axial direction of the drum 10 (hereinafter, simply referred to as “axial direction”. The “axial direction” corresponds to the belt width direction). And a plate-like member curved along the outer peripheral surface 10x of the drum 10 that is shorter than the drum 10 in the circumferential direction. The convex forming member 20 is formed by machining carbon steel (S55C or the like) or the like, and the groove forming surface 20x that is the inner peripheral surface thereof may be protected by hard chrome plating or the like.

  The reaction force member 30 includes a base portion 31 and a pair of contact portions 32. The base 31 is a rectangular flat plate member having substantially the same length as the drum 10 in the axial direction and shorter than the drum 10 in the circumferential direction. The pair of abutting portions 32 are fixed in the vicinity of both axial ends of the surface of the base portion 31 facing the outer peripheral surface 10x of the drum 10, and near the both axial ends of the outer peripheral surface 10x of the drum 10 (the sleeve 1 is disposed). Are not in contact with each other). The inner surfaces of the pair of contact portions 32 (surfaces that contact the outer peripheral surface 10x of the drum 10) may be flat or may be curved along the outer peripheral surface 10x. Of the reaction member 30, only the pair of contact portions 32 are in contact with the outer peripheral surface 10 x of the drum 10, and the base portion 31 is not in contact with the outer peripheral surface 10 x of the drum 10. Further, neither the base portion 31 nor the pair of contact portions 32 of the reaction force member 30 is in contact with the sleeve 1. The base 31 may be formed from carbon steel (for example, S55C) or the like, and the pair of contact portions 32 may be formed from a hard resin material (for example, nylon resin) or the like.

  The heater 40 is a plate heater in which a heating element (nichrome wire) is sandwiched between insulators (mica (mica)), and is disposed on the outer peripheral surface of the convex portion forming member 20.

  The pressing means 50 is used to press the groove forming surface 20x against the outer peripheral surface 1x of the sleeve 1 when forming the convex portion, and one set is provided for each of the convex portion forming member 20 and the reaction force member 30. A pair of upper and lower cylinders (pneumatic cylinder, hydraulic cylinder, electric cylinder, etc.).

  The pair of frames 60 are erected on the mount 70 and support the cylinder of the pressing means 50 on the outer sides of the convex portion forming member 20 and the reaction force member 30.

  In the convex portion forming step S2, first, as shown in FIG. 4A, the outer peripheral surface 10x of the drum 10 and the groove forming surface 20x of the convex portion forming member 20 are arranged so as to face each other with the sleeve 1 interposed therebetween. At this time, on the opposite side of the convex portion forming member 20 across the drum 10, as shown in FIGS. 2, 3 </ b> A, and 3 </ b> B, the pair of contact portions 32 of the reaction force member 30 is formed on the drum 10. It is in contact with the outer peripheral surface 10x. And the convex part formation member 20 of the state heated with the heater 40 is pressed with the press means 50, and as shown in FIG.4 (b), the coating layer 1d is provided between the convex part formation member 20 and the compression layer 1a. In a state of being interposed, the groove forming surface 20x is pressed against the outer peripheral surface 1x of the sleeve 1. At this time, on the opposite side of the convex portion forming member 20 across the drum 10, as shown in FIGS. 2 and 3A, 3B, the reaction force member 30 is prevented from moving by the pressing force. The drum 10 is supported. Thereby, the convex part 1v is formed in a part of outer peripheral surface 1x of the sleeve 1 (part pressed by the groove formation surface 20x).

  Thereafter, the pressing by the pressing means 50 is released, and the convex portion forming member 20 and the reaction force member 30 are separated from the outer peripheral surface 1x of the sleeve 1 (see FIG. 4C). Then, the drive unit 16 turns the support unit 15 together with the drum 10 in the circumferential direction by a predetermined angle (an angle corresponding to the groove forming surface 20x), and a portion of the outer peripheral surface 1x of the sleeve 1 where the convex portion 1v is not yet formed and the groove The groove forming surface 20x is pressed against the outer peripheral surface 1x of the sleeve 1 again with the forming surface 20x facing.

  The above operation is repeated to form the convex portion 1v on the entire outer peripheral surface 1x of the sleeve 1. That is, the convex portion forming step S2 is performed while changing the pressing position of the groove forming surface 20x against the outer peripheral surface 1x of the sleeve 1.

  And after the convex part 1v is formed in the whole outer peripheral surface 1x of the sleeve 1, the sleeve 1 is taken out from the drum 10. FIG. For example, as shown in FIG. 4C, the sleeve 1 is pulled out from the drum 10 together with the release paper 2 by moving the sleeve 1 in the axial direction. Alternatively, the drum 10 may be moved in the axial direction while pressing the sleeve 1 against the outer peripheral surface 10 x of the drum 10 or blowing air between the outer peripheral surface 10 x of the drum 10 and the sleeve 1. At this time, the sleeve 1 may be gripped and moved by the operator's hand, or the sleeve 1 and the drum 10 may be moved using any device. Further, in order to facilitate the take-out operation, a release agent may be applied to the outer peripheral surface 10x of the drum 10 in advance, or the release paper 2 and the release agent may be used in combination. You may use only.

  At this stage, the sleeve 1 is in an unvulcanized state. That is, in the convex portion forming step S2, the pressure, temperature, time, and the like are controlled so that vulcanization is not performed.

  In the vulcanization step S3 performed after the convex portion formation step S2, the sleeve 1 is vulcanized using a vulcanizer 150 shown in FIG.

  The vulcanizer 150 includes an inner mold 160 and an outer mold 170. The inner mold 160 includes a cylindrical drum 161, a cylindrical flexible jacket 162, an upper lid 163, and the like. The outer mold 170 is a cylindrical heating jacket in which a plurality of grooves 170v corresponding to the plurality of convex portions 1v are formed on the inner peripheral surface.

  In the vulcanization step S3, first, the release paper 2 is peeled from the sleeve 1, and then the sleeve 1 is mounted on the outer mold 170 so that the plurality of convex portions 1v are accommodated in the plurality of grooves 170v, respectively. Thereafter, as shown in FIG. 5A, the inner mold 160 is attached to the outer mold 170. Then, as shown in FIG. 5B, the outer mold 170 is heated by supplying steam to the inside, and the flexible jacket 162 is expanded to vulcanize the sleeve 1. After vulcanization, with the flexible jacket 162 expanded, water is circulated inside the outer mold 170 to cool the sleeve 1. Then, as shown in FIG. 5 (c), the flexible jacket 162 is sucked by vacuuming and separated from the sleeve 1, and then the inner mold 160 is moved upward to separate from the outer mold 170, and then The sleeve 1 is taken out from the outer mold 170.

  Further, the V-ribbed belt is completed by cutting the sleeve 1 in accordance with the belt width.

  As described above, according to the present embodiment, since the convex portion is formed without being ground, the material loss can be suppressed. Moreover, since it is not the structure which extends a core wire when integrating a 2nd sleeve with a 1st sleeve like the method of patent document 1, the alignment state of a core wire can be hold | maintained favorably, and Restrictions are unlikely to occur in the material of the core wire and the belt circumference.

  The sleeve formation step S1 includes an extension layer arrangement step S1b in which the extension layer 1c is arranged so as to sandwich the core wire 1b with the compression layer 1a. In this case, the alignment state of the cores 1b can be more reliably and satisfactorily maintained by forming the protrusions while the cores 1b are buried between the stretched layer 1c and the compression layer 1a.

  In the sleeve forming step S1, the sleeve 1 is formed on the outer peripheral surface 10x of the drum 10, and the convex portion forming step S2 is performed in a state where the sleeve 1 is mounted on the outer peripheral surface 10x of the drum 10. In this case, by making the tool (drum 10) common in the sleeve forming step S1 and the convex portion forming step S2, it is not necessary to prepare a tool for forming the convex portion separately, and the manufacturing cost can be reduced. Work efficiency is improved.

  The convex portion forming step S2 is performed while changing the pressing position of the groove forming surface 20x against the outer peripheral surface 1x of the sleeve 1. In this case, the convex portion can be easily formed using the relatively small convex portion forming member 20.

  The core wire 1b is composed of an aramid fiber. The aramid fiber has characteristics such as high strength and high elastic modulus (difficult to stretch), and by constituting the core wire 1b with an aramid fiber, the transmission belt can be made thinner and the bending rigidity can be reduced. And transmission belts can be applied to high load systems. Further, although the aramid fiber is difficult to stretch due to its high elastic modulus, the present invention is not configured to stretch the core wire when the second sleeve is integrated with the first sleeve as in the method described in Patent Document 1. Aramid fibers can be suitably used as the material for the wire 1b.

  In the convex portion forming step S2, the groove forming surface 20x of the convex portion forming member 20 is pressed against the outer peripheral surface 1x of the sleeve 1 with the covering layer 1d interposed between the convex portion forming member 20 and the compression layer 1a. By doing. In this case, the coating layer 1d improves the air permeability and suppresses the remaining air, so that the air venting effect is improved (evacuation can be made unnecessary). Further, the convex portion forming member 20 can be easily peeled from the sleeve 1 after the convex portion forming step S2. Furthermore, since the formation state of the convex portion 1v is stabilized and the friction coefficient of the surface of the convex portion 1v is lowered, the mounting property of the sleeve 1 to the member (outer mold 170) to which the sleeve 1 is mounted in the vulcanization step S3 is improved. To do. In addition, stabilization of the surface characteristics (friction coefficient, etc.) of the belt can be realized.

  Then, with reference to FIG. 6, the manufacturing method which concerns on 2nd Embodiment of this invention is demonstrated. The second embodiment is the same as the first embodiment except that the convex portion forming step S2 and the convex portion forming apparatus used in the step are different from the first embodiment.

  In 2nd Embodiment, in convex part formation process S2, the convex part formation apparatus 200 shown in FIG. 6 is used instead of the convex part formation apparatus 100 shown in FIG. The convex portion forming apparatus 200 includes a convex portion forming member 220 shown in FIGS. 6A and 6B instead of the convex portion forming member 20 shown in FIGS. ) And (b) include the reaction force member 230 shown in FIGS. 6A and 6B instead of the reaction force member 30, and instead of the heater 40, heat is generated inside the convex portion forming member 220. It differs from the convex part forming apparatus 100 in that a heater (not shown) configured to circulate water (heat medium) is included.

  The convex portion forming member 220 has a cylindrical shape, and a plurality of grooves 220v corresponding to the plurality of convex portions 1v are formed on the outer peripheral surface corresponding to the groove forming surface 220x. The convex portion forming member 220 is supported by the base portion 221 so as to be rotatable about an axis along the axial direction of the drum 10. The convex forming member 220 has substantially the same length as the drum 10 in the axial direction. The convex portion forming member 220 is formed by machining carbon steel (S55C or the like) or the like, and the groove forming surface 220x that is the outer peripheral surface thereof may be protected by hard chrome plating or the like.

  The reaction force member 230 includes a base portion 231 and a pair of contact portions 232. Each of the pair of contact portions 232 has a columnar shape, and is supported so as to be rotatable around an axis along the axial direction of the drum 10 in the vicinity of both axial ends of the surface of the base portion 231 facing the outer peripheral surface 10x of the drum 10. The outer peripheral surface 10x of the drum 10 is in contact with the vicinity of both axial ends (the portion where the sleeve 1 is not disposed). Of the reaction member 230, only the pair of contact portions 232 are in contact with the outer peripheral surface 10 x of the drum 10, and the base portion 231 is not in contact with the outer peripheral surface 10 x of the drum 10. Further, the base 231 and the pair of contact portions 232 of the reaction force member 230 are not in contact with the sleeve 1. The base 231 may be formed from carbon steel (for example, S55C) or the like, and the pair of contact portions 232 may be formed from a hard resin material (for example, nylon resin) or the like.

  In the convex portion forming step S2 of the second embodiment, first, the outer peripheral surface 10x of the drum 10 and the groove forming surface 220x of the convex portion forming member 220 are disposed so as to face each other with the sleeve 1 interposed therebetween. At this time, the pair of contact portions 232 of the reaction force member 230 are in contact with the outer peripheral surface 10x of the drum 10 on the opposite side of the convex portion forming member 220 across the drum 10. And the convex part formation member 220 of the state heated with the heater (not shown) is pressed with the press means 50, and as shown in FIG.6 (c), it coat | covers between the convex part formation member 220 and the compression layer 1a. The groove forming surface 220x is pressed against the outer peripheral surface 1x of the sleeve 1 with the layer 1d interposed. At this time, the reaction force member 230 supports the drum 10 so that the drum 10 does not move by the pressing force on the opposite side of the convex portion forming member 220 across the drum 10. Thereby, the convex part 1v is formed in a part of outer peripheral surface 1x of the sleeve 1 (part pressed by the groove formation surface 220x).

  In the second embodiment, while the groove forming surface 220x is pressed against the outer peripheral surface 1x of the sleeve 1, the support unit 15 is swung in the circumferential direction together with the drum 10 by the driving unit 16, so that the entire outer peripheral surface 1x of the sleeve 1 is provided. Convex part 1v is formed. That is, also in the second embodiment, similarly to the first embodiment, the convex portion forming step S2 is performed while changing the pressing position of the groove forming surface 220x against the outer peripheral surface 1x of the sleeve 1. The process after the convex portion 1v is formed on the entire outer peripheral surface 1x of the sleeve 1 is the same as that in the first embodiment.

  Subsequently, a manufacturing method according to a third embodiment of the present invention will be described with reference to FIGS. The third embodiment is the same as the first embodiment except that the convex portion forming step S2 and the convex portion forming apparatus used in the step are different from the first embodiment.

  In 3rd Embodiment, in convex part formation process S2, the convex part formation apparatus 300 shown in FIG. 8 is used instead of the convex part formation apparatus 100 shown in FIG. The convex portion forming apparatus 300 includes a convex portion forming member 320 shown in FIG. 7C instead of the convex portion forming member 20 shown in FIGS. 3A and 3B, and FIGS. ) Is different from the convex forming apparatus 100 in that it does not include the reaction force member 30, the heater 40, and the frame 60, and adopts a cylindrical flexible jacket 350 instead of a cylinder as a pressing means.

  The convex forming member 320 is an annular member in which the inner peripheral surface corresponding to the groove forming surface 320 x surrounds the outer peripheral surface 1 x of the sleeve 1. A plurality of grooves 320v corresponding to the plurality of convex portions 1v are formed on the groove forming surface 320x.

  As shown in FIGS. 7A and 7B, for example, a method of manufacturing the convex portion forming member 320 has a flat upper plate 391 and a plurality of convex portions 392v corresponding to the plurality of grooves 320v formed on the upper surface. A step of pressing and vulcanizing by sandwiching a base material (rubber matrix) 320a to be the convex forming member 320 between the lower plate 392, a step of press-bonding unvulcanized end portions after the step, etc. including. From the viewpoint of easily peeling the convex portion forming member 320 from the upper plate 391, when the upper plate 391 and the lower plate 392 are pressed, the release paper 2 is interposed between the upper plate 391 and the base material 320a. It is preferable.

  The manufacturing method of the convex part formation member 320 is not limited to said method, For example, you may include the process of winding the base material 320a around a drum and vulcanizing | curing with a vulcanization can.

  The convex forming member 320 and the flexible jacket 350 are rubbers containing rubber components such as ethylene-propylene-diene rubber, millable urethane rubber, chloroprene rubber, nitrile rubber, hydrogenated nitrile rubber, styrene-butadiene rubber, natural rubber, butyl rubber and the like. It may consist of a composition. The convex forming member 320 further includes short fibers oriented in the axial direction (for example, nylon, cotton (denim) obtained by RFL treatment). In addition, the base material 320a of the convex forming member 320 used in Example 4 described later is made of a rubber composition containing chloroprene rubber as a rubber component, and nylon and cotton (denim) having a cut length of 6 mm. Each of the short fibers subjected to RFL treatment was blended at a ratio of 10 parts by weight (total 20 parts by weight) with respect to 100 parts by weight of the rubber component, so that the thickness was 5 mm. Further, the flexible jacket 350 used in Example 4 to be described later vulcanizes a 6 mm thick base material composed of a rubber composition containing butyl rubber as a rubber component by a known method (for example, the base material). Wrapped around a drum and vulcanized with a vulcanizing can).

  From the viewpoints of improving air permeability and air bleeding effect, a coating layer made of a knitted fabric may be provided on the groove forming surface 320x. In addition, from the viewpoint of suppressing shrinkage in the axial direction of the convex portion forming member 320, a cylindrical outer covering body that covers the convex portion forming member 320 may be further provided.

  In the convex portion forming step S2 of the third embodiment, as shown in FIGS. 8A and 8B, the outer peripheral surface 10x of the drum 10 and the groove forming surface 320x of the convex portion forming member 320 are sandwiched by the sleeve 1. These are arranged so as to face each other, and these are arranged in the flexible jacket 350. After that, the drum 10 and the flexible jacket 350 are sandwiched in the axial direction between the upper lid 360 and the bottom plate (not shown), and the pressure, temperature, time, etc. are controlled so that vulcanization is not performed. External pressure (vapor pressure) is applied from the outside of the protective jacket 350. Thereby, the convex part 1v is formed in the whole outer peripheral surface 1x of the sleeve 1. FIG. Thus, in the third embodiment, unlike the first and second embodiments, the convex portion forming step S2 is performed in a state where the outer peripheral surface 1x of the sleeve 1 is surrounded by the groove forming surface 320x.

  After the convex portion 1v is formed on the entire outer peripheral surface 1x of the sleeve 1, the upper cover 360 is removed, the flexible jacket 350 is removed, and the sleeve 1 is taken out from the drum 10 together with the convex portion forming member 320. 1 is removed from the convex forming member 320.

  As described above, according to the present embodiment, the convex portion forming step S2 is performed in a state where the outer peripheral surface 1x of the sleeve 1 is surrounded by the groove forming surface 320x. Thereby, convex part formation can be performed easily.

  The convex portion forming member 320 has at least a groove 320v made of rubber, and the rubber includes short fibers oriented in the axial direction of the convex portion forming member 320 corresponding to the belt width direction. In this case, the shrinkage in the axial direction of the rubber is suppressed, and the pitch shift of the convex portion 1v in the belt width direction can be prevented. As a result, the sleeve 1 can be securely attached to the member (outer mold 170) to which the sleeve 1 is attached in the vulcanization step S3, and as a result, the dimensional accuracy of the manufactured transmission belt can be improved. Further, since shrinkage with time in the axial direction of the rubber is also suppressed, the number of times the convex portion forming member 320 can be used, which is judged from the viewpoint of dimensional accuracy, is increased, which is economical.

  Next, a manufacturing method according to the fourth embodiment of the present invention will be described with reference to FIG. The manufacturing method according to the fourth embodiment is a method of manufacturing a low-edge cog type V-belt (low-edge cog belt) having a plurality of cogs (convex portions) extending in the belt width direction on one surface. The portion forming step S2 and the convex portion forming apparatus used in the step are different from those in the third embodiment, and the other portions are the same as those in the third embodiment. The elongated layer 1c in the sleeve 1 according to the fourth embodiment includes a covering layer (not shown) made of canvas or the like.

  In the fourth embodiment, in the convex portion forming step S2, a convex portion forming apparatus 400 shown in FIG. 9 is used instead of the convex portion forming apparatus 300 shown in FIG. The convex portion forming apparatus 400 is different from the convex portion forming apparatus 300 in that it includes a convex portion forming member 420 instead of the convex portion forming member 320.

  Similar to the convex portion forming member 320, the convex portion forming member 420 is an annular member in which the inner peripheral surface corresponding to the groove forming surface 420x surrounds the outer peripheral surface 1x of the sleeve 1, and a plurality of convex portions are formed on the groove forming surface 420x. A plurality of grooves 420v corresponding to 1v are formed. However, in the present embodiment, since each convex portion 1v extends in the belt width direction, each groove 420v extends in the belt width direction.

  The manufacturing method of the convex portion forming member 420, the constituent material of the convex portion forming member 420, and the like may be the same as those of the convex portion forming member 320. Moreover, convex part formation process S2 of 4th Embodiment is the same as that of 3rd Embodiment, and is performed using the flexible jacket 350 as a press means.

  As shown in FIG. 10A, the inventor performs Comparative Examples 1 to 4 according to the manufacturing method of Patent Document 1, Examples 1 to 3 according to the manufacturing method of the first embodiment, and the third embodiment. Example 4 related to the manufacturing method was performed, and the appearance of the ribs in the sleeve after vulcanization and the arrangement state of the cores in the sleeve after vulcanization were confirmed.

  The sleeves of Comparative Examples 1 to 4 and Examples 1 to 4 have the same configuration as that of the sleeve 1 shown in FIG. 5B, respectively, and include a compression layer 1a (thickness 2.0 mm) and a core wire 1b (aramid core wire). In the case of polyester, it has a diameter of 0.7 mm, and in the case of a polyester core wire, it has a diameter of 1.0 mm), a stretched layer 1c (thickness of 0.8 mm) and a covering layer 1d (thickness of 0.8 mm) made of knitted fabric, The total thickness is 4.3 mm and the width is 400 mm at the stage, and the total thickness is 4.1 mm and the width is 400 mm after the vulcanization, and the belt peripheral length POC after the vulcanization is as shown in FIG.

  The rubber for the stretch layer 1c, the rubber for the compression layer 1a, and the rubber for adhesion treatment of the coating layer 1d have the same composition in Comparative Examples 1 to 4 and Examples 1 to 4, respectively, and the materials and blending ratios are 10 (b). For the stretched layer 1c and the compressed layer 1a, rubber blended as shown in FIG. 10 (b) was kneaded using a known method such as a Banbury mixer, and the kneaded rubber was passed through a calender roll to a predetermined thickness. . For the coating layer 1d, a rubber for adhesion treatment having the composition shown in FIG. 10B was dissolved in an organic solvent to form a rubber paste, and the knitted fabric of the coating layer 1d was immersed in the rubber paste.

The knitted fabric constituting the coating layer 1d is the same in Comparative Examples 1 to 4 and Examples 1 to 4, and a cellulose-based natural spun yarn (cotton yarn) is used on the belt surface (friction transmission surface) side, and the compressed layer 1a side is used. And a polyester composite yarn (PTT / PET conjugate yarn: a composite yarn conjugated with polytrimethylene terephthalate (PTT) and polyethylene terephthalate (PET)). In addition, the knitted fabric structure includes a cellulose composite yarn having a knitting ratio of 60% by mass, and a polyethylene glycol type nonionic surfactant which is a nonionic surfactant as a hydrophilic treatment agent (hydrophilic softener). Was multi-layered and the bulkiness was 3.2 cm ³ / g.

  About the core wire 1b, in Comparative Examples 1 and 2 and Example 1, 1100 dtex / 1 × 3 configuration (3300 dtex in total), various twists (upper twisting factor 3.0, lower twisting factor 3.0), tensile stress 100N A polyester core wire having an elongation of 2.0% and an elongation of 3.3% at a tensile stress of 140 N was used. In Comparative Examples 3 and 4 and Examples 2 to 4, 1670 dtex / 1 × 2 configuration, Lang twist (upper twist coefficient 4.5, lower twist coefficient 1.0), elongation 0.9% at a tensile stress of 100 N, A para-aramid cord with an elongation of 1.2% at a tensile stress of 140 N was used. Further, in both Comparative Examples 1 to 4 and Examples 1 to 4, the core wire 1b was dipped in a resorcin-formalin-latex liquid (RFL liquid) to which a water-soluble epoxy compound was added in order to improve the adhesion to rubber. . Thereafter, the cores 1b of Comparative Examples 3 and 4 and Examples 2 to 4 were further coated with a treatment liquid in which a rubber composition containing EPDM was dissolved in an organic solvent (toluene) and polymeric isocyanate was added. .

  First, Comparative Examples 1 and 2 and Example 1 using a polyester core as the core 1b will be considered. Comparative Examples 1 and 2 are based on the manufacturing method of Patent Document 1 (a configuration in which the core wire is extended when the first sleeve including the compression layer and the second sleeve including the core wire and the extension layer are integrated) In Comparative Example 1 (belt circumferential length 500 mm) in which the gap between the first sleeve and the second sleeve can be secured 1.0 mm, there are problems in both the appearance of ribs (convex parts) and the arrangement of the cores in the sleeve after vulcanization. In Comparative Example 2 (belt peripheral length 450 mm) in which the gap was less than 1.0 mm, wrinkles occurred partially on the rib surface (coating layer) in the vulcanized sleeve, and the core Partial disturbance also occurred in the arrangement state of the lines. Therefore, in the manufacturing method of Patent Document 1, when a polyester core wire is employed, it is necessary to secure the gap of 1.0 mm or more (that is, the belt circumferential length is 500 mm or more) from the viewpoint of ensuring the quality of the transmission belt. I understood it. On the other hand, in Example 1, the belt peripheral length was 450 mm, but there was no problem in both the appearance of the ribs and the arrangement of the cores in the vulcanized sleeve.

  Next, Comparative Examples 3 and 4 and Examples 2 to 4 using an aramid core wire as the core wire 1b will be considered. Comparative Examples 3 and 4 are based on the manufacturing method of Patent Document 1 (a configuration in which the core wire is extended when the first sleeve including the compression layer and the second sleeve including the core wire and the extension layer are integrated) In the case of an aramid core wire, since it has a characteristic that it is difficult to stretch, even if the upper twisting factor is increased and it is easy to stretch, it is necessary to secure a certain gap between the first sleeve and the second sleeve. In the case of the length of 1100 mm, there was no problem in the appearance of the ribs and the arrangement of the cores in the sleeve after vulcanization, but in Comparative Example 4 (belt circumference 1000 mm), the surface of the rib (covering) The layer was partially wrinkled, and the cores were partially disturbed. Therefore, in the manufacturing method of patent document 1, when an aramid core wire was employ | adopted, it turned out that a belt peripheral length needs to be 1100 mm or more from the point of ensuring the quality of a transmission belt. On the other hand, in Example 2, the belt circumferential length was 1000 mm, and in both Examples 3 and 4, the belt circumferential length was 450 mm. However, there was no problem in both the appearance of the ribs and the arrangement of the cores in the sleeve after vulcanization. .

  That is, according to the present invention, a belt having a relatively short belt circumference that is difficult to manufacture from the viewpoint of ensuring quality by the manufacturing method of Patent Document 1 regardless of whether a polyester core wire or an aramid core wire is adopted as the core wire 1b. (In other words, the belt circumferential length is less likely to be restricted as compared with the manufacturing method of Patent Document 1).

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims.

-Constituent materials, such as a convex formation member and a drum, are not specifically limited. For example, in the first and second embodiments, the convex portion forming member is formed by machining carbon steel (S55C or the like) or the like, but is formed from a hard resin material (for example, nylon resin) or the like. The portion including the groove forming surface may be formed of a hard resin material, and the other portion may be formed of a metal material.
In the first and second embodiments, the sleeve 1 is provided with one set of the convex forming member 20; 220 and the reaction force member 30; 230 facing each other with the drum 10 interposed therebetween. On the other hand, you may arrange | position two or more sets of convex part formation member 20; 220 and reaction force member 30; 230 which mutually oppose on both sides of the drum 10. FIG. In this case, the pressing timing with respect to the outer peripheral surface 1x of the sleeve 1 for the two or more convex portion forming members 20; 220 may be the same or may be shifted.
In the first and second embodiments, the drum 10 is cantilevered by the support unit 15, but the drum 10 may be supported on both sides by the support unit 15.
In the first and second embodiments, since the drum 10 is cantilevered by the support portion 15, it is preferable to provide the reaction force member 30; 230 with respect to the convex portion forming member 20; 220. Is supported by the support portion 15 at both ends, the reaction member 30; 230 may be omitted.
-Although the convex formation member 20 of 1st Embodiment is a plate-shaped member curved along the outer peripheral surface 10x of the drum 10, it may be a flat plate-shaped member. In this case, in the convex portion forming step S2, the groove forming surface and the outer peripheral surface of the sleeve are in line contact, and the convex portion forming member and the convex portion forming member 20 are compared to the case where the convex portion forming member 20 is a curved plate member. Since the contact area with the sleeve is reduced, a large pressing force acts on the sleeve, so that the convex portion can be easily formed, and the equipment load can be reduced.
In the first embodiment, the heater 40 is not disposed on the outer peripheral surface of the convex portion forming member 20 but may be a heater (cartridge heater or the like) built in the convex portion forming member 20.
-A press means is not limited to the structure of embodiment mentioned above. For example, in the first and second embodiments, a pair of upper and lower cylinders is provided for each of the convex portion forming member 20; 220 and the reaction force member 30; 230, but the convex portion forming member 20; 220 is provided. A plurality of pairs of upper and lower cylinders may be provided for each of the reaction force members 30 and 230. Further, in the first or second embodiment, an electric cylinder is adopted as the cylinder provided on the reaction force member 30; 230 side, and the pair of contact portions 32; 232 are in positions where they contact the outer peripheral surface 10x of the drum 10. The electric cylinder may be controlled so that the reaction force member 30; 230 is fixed. In this case, a large pressing force acts on the sleeve when the convex portion is formed, so that the convex portion can be easily formed, and the equipment load can be reduced.
-You may replace the reaction force member 30; 230 of 1st and 2nd embodiment with the pulley which can rotate centering on the axis | shaft along the axial direction of the drum 10. As shown in FIG. When the said structure is employ | adopted for 1st Embodiment, whenever the convex part formation position is changed, the operation | movement of separating the contact part 32 from the outer peripheral surface 10x, and making it contact | abut to the outer peripheral surface 10x again becomes unnecessary.
・ Pressure bonding of each component (compressed layer, core wire, stretched layer, covering layer, etc.) laminated in the sleeve forming process may be performed in the sleeve forming process, or simultaneously with the convex forming in the convex forming process. May be.
-You may perform the process (coating of an adhesive layer) for improving the adhesiveness with another element to each component (a compression layer, a core wire, an elongate layer, a coating layer, etc.) of a transmission belt.
-In above-mentioned embodiment, although the case where a rib or cog corresponds to a convex part was illustrated, when a power transmission belt is a toothed belt, a tooth part corresponds to a convex part.

DESCRIPTION OF SYMBOLS 1 Sleeve 1a Compression layer 1b Core wire 1c Elongation layer 1d Coating layer 1v Convex part 1x Outer peripheral surface of sleeve 10 Drum 10x Outer peripheral surface of drum 20; 220; 320; 420 Convex forming member 20v; 220v; 320v; 420v Groove 20x; 220x; 320x; 420x Groove forming surface 100; 200; 300; 400 Convex forming device

Claims (8)

A compression layer having a plurality of protrusions extending in the belt longitudinal direction or the belt width direction on one surface, and a core extending in the belt longitudinal direction on the other surface of the compression layer opposite to the one surface A method of manufacturing a transmission belt including a
Forming an annular sleeve including the compression layer, a sleeve forming step;
After the sleeve forming step, forming the plurality of convex portions on the one surface of the compression layer in the sleeve, and a convex portion forming step,
A vulcanization step for vulcanizing the sleeve after the convex portion formation step,
The sleeve further includes the core wire,
The sleeve forming step includes a core wire arranging step of arranging the core wire on the other surface of the compressed layer so as to coincide with a pitch circumference at the time of vulcanization in the vulcanization step ,
In the convex portion forming step, the groove forming surface of the convex portion forming member having a groove forming surface formed with a plurality of grooves corresponding to the plurality of convex portions corresponds to the one surface of the compression layer. A method for manufacturing a power transmission belt, comprising pressing the outer peripheral surface of a sleeve. The transmission belt further includes an extension layer that sandwiches the core wire with the compression layer,
The sleeve further includes the stretch layer,
2. The manufacturing method according to claim 1, wherein the sleeve forming step further includes an extension layer arranging step of arranging the extension layer so as to sandwich the core wire with the compression layer. In the sleeve forming step, the sleeve is formed on the outer peripheral surface of a cylindrical drum so that the outer peripheral surface of the drum and the other surface of the compression layer are opposed to each other with the core wire in between.
The manufacturing method according to claim 1, wherein the projecting portion forming step is performed in a state where the sleeve is mounted on the outer peripheral surface of the drum.   The manufacturing method according to claim 1, wherein the convex portion forming step is performed while changing a pressing position of the groove forming surface with respect to the outer peripheral surface of the sleeve. The convex portion forming member is an annular member in which an inner peripheral surface corresponding to the groove forming surface surrounds the outer peripheral surface of the sleeve,
The said convex-part formation process is performed in the state which surrounded the said outer peripheral surface of the said sleeve by the said inner peripheral surface, The manufacturing method as described in any one of Claims 1-3 characterized by the above-mentioned. The convex portion forming member has at least a groove portion made of rubber,
The said rubber | gum contains the short fiber oriented in the axial direction of the said convex-part formation member corresponding to the said belt width direction, The manufacturing method of Claim 5 characterized by the above-mentioned.   The said core wire is comprised from an aramid fiber, The manufacturing method as described in any one of Claims 1-6 characterized by the above-mentioned. The transmission belt has a coating layer made of a knitted fabric that covers the plurality of convex portions on the one surface,
The convex portion forming step presses the groove forming surface of the convex portion forming member against the outer peripheral surface of the sleeve in a state where the covering layer is interposed between the convex portion forming member and the compression layer. The manufacturing method according to claim 1, wherein the manufacturing method is performed.