JP2001096537A - Belt molding vulcanization apparatus and preparation method of belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form an unevenness on the outer peripheral face of a belt without using a rubber sleeve. SOLUTION: A belt molding and vulcanizing apparatus is provided with a cylindrical mold 2 being removably provided, pieces 9 of a mold wherein an outer mold frame formed so as to surround the cylindrical mold 2 and provided with a no. of long holes with a uniform width passing through the side wall in the direction toward the axis of the cylindrical mold 2 on the peripheral direction at specified pitches and an outer mold being fitted into the long holes and being freely horizontally movably provided in the direction toward the above described axis and being formed into approximately the same thickness as the width of the long hole so as to avoid to generate a gap between the side face of the long hole and being brought into contact with the outer peripheral face of a belt precursor 3 and covering this and on the inner peripheral face of which projections are provided at specified pitches in the peripheral direction by being projected from the inner peripheral face of the outer mold frame, are formed with the outer mold frame, a heating means for heating the outer mold frame and the pieces 9 of the mold, a forwarding mechanism for forwarding the pieces 9 of the mold in the direction toward the above described direction and a retreating mechanism for retrating the pieces 9 of the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt forming vulcanizing apparatus for forming and vulcanizing a power transmission belt having irregularities on both the inner and outer circumferences of the belt and a method of manufacturing the belt. The technical field includes a vulcanizing apparatus and a manufacturing method of a tension band of a high-load transmission V-belt used for a belt transmission such as a belt-type continuously variable transmission in a general-purpose agricultural machine or an automobile.

[0002]

2. Description of the Related Art In recent years, belt type continuously variable transmissions have been developed as transmissions for agricultural machines such as combines and tractors, automobiles, and the like, from the viewpoint of improving operability during shifting and improving fuel consumption rate. Is underway. As a high-load transmission V-belt used in this type of transmission, for example, one described in Japanese Patent Application Laid-Open No. 60-49151 is known.

In this device, as shown in FIG. 7, a large number of blocks b are locked and fixed at a predetermined pitch and a predetermined interval in a belt circumferential direction on a pair of endless tension bands a on both sides. Has become. More specifically, as shown in FIG. 8, on the upper and lower surfaces of each tension band a, a number of upper surface grooves c and lower surface grooves d are provided at predetermined pitches in the belt circumferential direction so as to extend in the belt width direction. In addition, on both sides of each block b, a long hole-shaped fitting portion penetrating in the belt circumferential direction is provided so as to extend in the belt width direction, and the upper edge e of the fitting portion is tensioned. The upper surface groove c of the band a and the lower edge f are engaged with the lower surface groove d, respectively, so that the block b is locked and fixed to both tension bands a.

The upper groove c and the lower groove d of the tension band a are formed in the tension band a in the following manner. That is,
The lower surface groove d is formed by setting a member such as rubber on the outer peripheral surface of a cylindrical mold having a plurality of ridges extending in the axial direction on the outer peripheral surface and provided at a predetermined pitch in the circumferential direction, and heating and heating the member. It is formed by pressing. The upper surface groove c is formed by externally fitting the tension band precursor with a rubber sleeve having a plurality of ridges extending in the axial direction on the inner peripheral surface and provided at a predetermined pitch in the circumferential direction, and heating and pressing. It is formed.

[0005]

However, if the rubber sleeve is used repeatedly, the ridge formed on the inner peripheral surface is deformed and hardened, and the dimensional accuracy of the formed upper surface groove is poor. Will be. Therefore, there is a problem that the rubber sleeve must be frequently replaced in order to secure the dimensional accuracy of the upper surface groove.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a belt vulcanization molding apparatus and a belt vulcanization molding apparatus capable of forming irregularities on a belt outer peripheral surface without using a rubber sleeve. It is to provide a manufacturing method.

[0007]

SUMMARY OF THE INVENTION The present invention provides a belt forming vulcanizing apparatus for forming irregularities on the outer peripheral surface of a belt.
A long hole of an outer mold frame surrounding the belt precursor formed on the outer peripheral surface of the cylindrical mold and extending in parallel with the axial direction on the side wall is provided with a large number of long holes at a predetermined pitch in the circumferential direction. By inserting a mold piece having a thickness substantially equal to the width of the long hole and projecting it to the inner peripheral surface of the outer mold frame, it contacts and covers the outer peripheral surface of the belt precursor, and is fixed to the outer peripheral surface of the belt precursor. An outer mold having a ridge provided on the inner peripheral surface so as to form the concave groove is formed.

Specifically, the invention of the present application is a belt forming vulcanizing apparatus, comprising: a cylindrical mold that is detachably provided;
An outer mold frame formed so as to surround the cylindrical mold, and provided on the side wall with a large number of long holes of uniform width penetrating in a direction toward the axis of the cylindrical mold at a predetermined pitch in the circumferential direction; It is fitted in the elongated hole and is provided so as to be horizontally movable in a direction toward the axis, and is formed to have a thickness substantially equal to the width of the elongated hole so that no gap is formed between the elongated hole and a side surface thereof. And, by projecting from the inner peripheral surface of the outer mold frame, it comes into contact with the outer peripheral surface of the rubber belt precursor provided on the outer peripheral surface of the cylindrical mold, covers the belt precursor, and covers the inner peripheral surface of the belt precursor. A mold piece that forms an outer mold with the outer mold frame provided with protrusions for forming a predetermined concave groove on the outer peripheral surface of the precursor at a predetermined pitch in the circumferential direction, and a rubber of the belt precursor. Heating means for heating the outer mold frame and mold pieces to vulcanize to a predetermined degree of vulcanization; and An advancing mechanism for advancing the mold piece in the direction toward the axis so as to be formed, and retreating the mold piece in a direction away from the axis so that the cylindrical mold can be detached after completion of molding vulcanization. And a retraction mechanism.

In the above-mentioned belt forming vulcanizing apparatus, a mold piece is fitted into the long hole of the outer mold frame having a long hole of uniform width on the side wall at a predetermined pitch in the circumferential direction. By protruding the mold pieces from the inner peripheral surface, an outer mold is formed which comes into contact with and covers the outer peripheral surface of the belt precursor, and the outer peripheral surface of the outer mold has a concave groove to be provided in the belt precursor. Corresponding ridges will be provided. That is, since the concave groove on the outer peripheral surface of the belt precursor is formed by the mold, there is no problem that the rubber sleeve needs to be frequently replaced as in the related art. Further, the shape accuracy of the concave groove is improved more than before.

[0010] Further, since the width of the elongated hole and the thickness of the mold piece are made substantially equal and the mold piece is guided by sliding on the side surface of the elongated hole, the elongated hole and the mold piece are formed. There is no problem that a gap is formed between the mold and the mold, and burrs are generated due to the outflow of rubber, and canvas or rubber is caught between the side surface of the long hole and the mold piece. In this case, it is conceivable to provide a gap between the mold pieces in a state where the outer mold is formed to allow the rubber to escape,
For example, a high-load transmission V that requires accuracy on the order of microns
In a belt tension band or the like, the generation of such rubber burrs is a fatal problem in quality and is not appropriate.

Further, since the mold piece is advanced toward or retracted from the axis of the cylindrical mold, the front portion of the projecting mold piece is radially attached to the outer peripheral surface of the belt precursor. It will come into contact with or be separated from it. Therefore,
When forming the outer mold, the front part of the mold piece slides on the outer peripheral surface of the belt precursor to form a convex portion by rubber or canvas,
When the outer mold is released, the concave groove is not deformed by applying an external force to the side surface of the concave groove in which the front portion of the mold piece is formed.

Here, as the heating means, means for holding the mold pieces in a high-temperature atmosphere such as a high-temperature and high-pressure steam atmosphere;
A means for providing a water passage in a mold piece, and a means for flowing pressurized hot water through the mold piece, attaching a band heater, a sheath heater, an infrared heater, etc. to the mold piece, or increasing the temperature of the mold piece by irradiating far infrared rays or induction heating. There is no particular limitation on electrical means and the like.

[0013] The advance mechanism is not particularly limited, but the mold is formed so as to face the opposite side of the cylindrical mold and extend outwardly in the axial direction of the cylindrical mold. It is convenient and preferable to provide an inclined surface provided on the piece and an outer mold forming member that applies an external force to the inclined surface in the axial direction to advance the mold piece. In this case, by forming the outer mold forming member so that an external force can be simultaneously applied to the back surfaces of all the mold pieces, the outer mold can be easily formed. Specifically, a configuration in which the back surface of the mold piece is formed on an inclined surface that extends outwardly in the axial direction of the cylindrical mold, and an outer mold forming member that exerts an external force in the axial direction on the inclined surface is arranged. Can be considered.

The retreat mechanism is not particularly limited, but the mold piece is formed so as to face the cylindrical mold side and extend outwardly in the axial direction of the cylindrical mold. It is convenient and preferable to provide the formed inclined surface and an outer mold disassembling member that applies an external force to the inclined surface in the axial direction to retract the mold piece. Also in this case, similarly to the case of the advance mechanism, the outer mold can be easily released by configuring the outer mold disassembling member to apply an external force to all the mold pieces at the same time.
Specifically, an outer mold disassembling member that forms an inclined surface facing the cylindrical mold side and extending outward as it goes in the axial direction at one end of the mold piece, and exerts an external force in the axial direction on the inclined surface. A configuration for arrangement is possible.

Another aspect of the present invention is a method for producing a belt in which a belt-shaped vulcanizing apparatus is used to form an irregular shape on the outer peripheral surface of the belt, wherein the belt-forming vulcanizing apparatus is detachably provided. A cylindrical mold, and a uniform-width elongated hole formed so as to surround the cylindrical mold and extending in the axial direction of the cylindrical mold on the side wall and penetrating in the direction toward the axis has a predetermined pitch in the circumferential direction. And a mold which is fitted into the elongated hole and has a thickness substantially equal to the width of the elongated hole so that no gap is formed between the outer die frame and the side surface of the elongated hole. And a step of providing a rubber belt precursor on the outer peripheral surface of the cylindrical mold, and a cylindrical mold provided with the belt precursor. A process for installing the belt at a predetermined position in the belt forming vulcanizing apparatus by fitting it into the outer mold frame. And moving the mold piece toward the axis of the cylindrical mold to cause the mold piece to protrude from the inner peripheral surface of the outer mold frame, and contact the outer peripheral surface of the belt precursor to form the belt. The outer mold frame and the mold are provided with ridges covering the precursor and having ridges for forming a predetermined groove on the outer peripheral surface of the belt precursor on the inner peripheral surface at a predetermined pitch in the circumferential direction. Heating the mold piece to remove rubber so that a predetermined groove is formed on the outer peripheral surface of the belt precursor by a ridge provided on the inner peripheral surface of the outer mold. A step of vulcanizing to a predetermined degree of vulcanization, and a step of unfastening the outer mold by retracting the mold piece in a direction away from the shaft to detach the cylindrical mold. Features.

According to the above-described belt manufacturing method, since the concave groove on the outer peripheral surface of the belt is formed by the mold, the rubber sleeve does not need to be replaced unlike the related art, and maintenance for the rubber sleeve is unnecessary. Further, the shape accuracy of the concave groove is improved more than before.

[0017]

As described above, according to the belt forming vulcanizing apparatus and the belt manufacturing method of the present invention,
Since the concave groove on the outer peripheral surface of the belt is formed by a mold, it is not necessary to use a rubber sleeve unlike the related art, and it is not necessary to replace the rubber sleeve. In addition, the shape accuracy of the concave groove is improved more than before.

Further, since the width of the elongated hole and the thickness of the mold piece are made substantially equal and the mold piece slides on the side surface of the elongated hole, the gap between the elongated hole and the mold piece is provided. There is no problem that burrs are generated due to the outflow of rubber due to voids, and that canvas or rubber is caught between the side surfaces of the long holes and the mold pieces.

Further, since the mold piece advances toward the axis of the cylindrical mold or retreats away from the axis, the front portion of the mold piece abuts against the outer peripheral surface of the belt precursor in the radial direction. Or, when the outer mold is formed, the front part of the mold piece slides on the outer peripheral surface of the belt precursor to form a convex portion by rubber or canvas, or when the outer mold is released, the mold piece is removed. The groove is not deformed by applying an external force to the side surface of the groove formed with the front portion.

[0020]

Embodiments of the present invention will be described in detail with reference to the drawings. The embodiments of the present invention are not limited to those described below. (Embodiment 1) FIG. 1 shows a tension belt forming vulcanizer for a V-belt for high load transmission according to Embodiment 1 of the present invention. This tension band forming vulcanizer is provided with a cylindrical heating jacket 1 constituting the outer periphery of a vulcanizing can. In addition, high-temperature steam can be introduced into the vulcanization can, thereby realizing a high-temperature atmosphere. A cylindrical mold 2 is detachably provided at the center of the heating jacket 1, and a rubber tension band precursor 3 is formed on the outer peripheral surface thereof. On the outer peripheral surface of the cylindrical mold 2, ridges having a semicircular cross section are formed at a predetermined pitch in the circumferential direction so as to extend in parallel with the axial direction, thereby forming a tension band on the inner peripheral surface of the tension band precursor 3. Is formed.

Here, the cylindrical mold 2 is set by fitting a tapered portion 2a provided at a lower portion into a cylindrical rubber holding down flange 4 provided at the bottom of a vulcanizing can. .

Also, positioning small projections 5 and 5 project from the bottom inside the rubber holding lower flange 4.
By fitting these positioning small projections 5 and 5 into positioning holes provided at the bottom of the cylindrical mold 2, the protrusions formed on the outer peripheral surface of the cylindrical mold 2 and the outer peripheral surface of the tension band precursor 3 are brought into contact. The cylindrical mold 2 is arranged so that a ridge formed on an inner peripheral surface of an outer mold described below surrounds the tension mold, and a lower surface groove of a tension band formed on an inner peripheral surface of the tension band precursor 3 is formed. The inner groove and the outer groove serving as the upper surface groove of the tension band formed on the outer peripheral surface are formed correspondingly.

Further, in a state where the cylindrical mold 2 on which the tension band precursor 3 is formed is set in a vulcanizing can, a rubber press upper flange 2b attached to the upper part of the cylindrical mold 2
The upward movement of the rubber of the tension band precursor 3 is regulated by the tension band precursor 3, and the downward flow of the rubber is regulated by the rubber holding down flange 4.

Further, the cylindrical mold 2 is
Four plate-shaped first mold pieces 6 are radially arranged at intervals. A lower projection 6a is provided below the first mold piece 6,
An upper projection 6b is formed on the upper part, and the lower projection 6a is fitted in an annular groove provided on the upper surface of a ring-shaped lower flange 7 provided on the bottom of the heating jacket 1, and the upper projection 6b is formed on the heating jacket 1. 1 is fitted into an annular groove provided on the lower surface of the ring-shaped upper flange 8 installed on the upper part. Then, the outer mold frame having 204 long holes extending in the side wall in parallel with the axis of the cylindrical mold 2 by the first mold piece 6, the lower flange 7, and the upper flange 8 is provided. The tension band precursor 3 formed and formed on the outer peripheral surface of the cylindrical mold 2 is surrounded by the outer mold frame. The front surface of the first mold piece 6, that is, the surface forming the inner periphery of the outer mold frame, is in contact with the outer peripheral surface of the tension band precursor 3. Each of the first mold pieces 6 is formed to be thicker from the front to the rear, so that the width of the long hole formed between the first mold pieces 6 is uniform.

A plate-shaped second mold piece 9 is inserted into a long hole formed between the first mold pieces 6. The front part of the second mold piece 9, that is, the surface facing the cylindrical mold 2 side is formed in a “convex” shape in cross section, and this is the side of the cylindrical mold 2 of the long hole of the outer mold frame. Ridges are provided at predetermined pitches in the circumferential direction to contact and cover the outer peripheral surface of the belt precursor 3 and to form predetermined grooves on the outer peripheral surface of the belt precursor 3 by projecting to the outer peripheral surface. The formed outer mold is formed. At this time, the inside of the vulcanization can is filled with high-temperature steam to create a high-temperature atmosphere, whereby the temperature of the cylindrical mold 2 and the outer mold is increased, and the rubber of the tension band precursor 3 is vulcanized. Becomes Then, on the outer peripheral surface of the tension band precursor 3, an outer groove having a “concave” cross section to be the upper surface groove of the tension band is formed. Therefore, according to the present tension band forming vulcanizing apparatus, since the outer groove on the outer peripheral surface of the tension band (the upper surface groove of the tension band) is formed by the mold, it is not necessary to use a rubber sleeve as in the prior art. Replacement of the rubber sleeve is not required. in addition,
The shape accuracy of the outer groove is improved more than before.

The thickness of the second mold piece 9 is substantially equal to the width of the elongated hole, and both side faces of the second mold piece 9 are guided by sliding on the side faces of the adjacent first mold piece 6. While moving forward and backward in the long hole. As a result, when the second mold piece 9 is retracted, no gap is generated between the first mold piece 6 and the adjacent first mold piece 6, and rubber or canvas is sandwiched between the mold pieces or the rubber flows out. Is prevented from occurring.

Further, since the second mold piece 9 advances toward the axis of the cylindrical mold 2 or retreats away from the axis, the front portion of the second mold piece 9 is a tension band precursor. 3
It comes into contact with or separates from the outer peripheral surface in the radial direction,
When the outer mold is formed, the front portion of the second mold piece 9 slides on the outer peripheral surface of the belt precursor 3 to form a convex portion with rubber or canvas, or when the outer mold is released, the second mold piece 9 is formed. No external force is exerted on the side surface of the groove in which the front portion is formed, so that the groove is not deformed.

Further, since the outer mold is formed by a large number of first mold pieces 6 and second mold pieces 9 of 408 or more, which are 200 or more, the shape error generated in each mold piece is canceled out. The outer mold has high shape accuracy as a whole. Each second mold piece 9 projects to form a ridge on the inner peripheral surface of the outer mold, that is, one ridge is formed for each second mold piece 9. Therefore, the shape accuracy of each ridge is maintained at a high level.

The rear surface of the second mold piece 9 is an inclined surface formed so as to extend outwardly as it goes downward. In the state shown in FIG. A mold clamping ring 10 as an outer mold forming member is formed on a tapered surface having the same taper ratio as the rear surface of the second mold piece 9 and is provided so as to be vertically displaceable. When the mold closing ring 10 is lowered (the lowering means is not shown),
A mechanism in which the inner peripheral surface comes into contact with the back surface of the second mold piece 9 to apply a vertical external force, and the second mold piece 9 advances to the cylindrical mold 2 side to form an outer mold; Has become. The mold closing ring 10 is configured to simultaneously contact the rear surfaces of all the second mold pieces 9, so that the outer mold can be easily formed.

Further, an upper cutout 9a is formed in the upper part of the front part of the second mold piece 9 so that the surface facing the cylindrical mold 2 side is an inclined surface extending rearward as going upward. A mold opening upper ring 11 as an outer mold disassembling member having a lower portion of the outer peripheral surface formed on a tapered surface having the same taper ratio as the inclined surface is disposed above the upper ring in the state of FIG. Then, when the mold opening upper ring 11 descends (the descending means is not shown), the lower part of the outer peripheral surface becomes the second mold piece 9.
Abuts against the inclined surface of the upper notch 9a to apply a vertical external force, and the second mold piece 9 is pushed outward. Similarly, a lower notch 9b is provided in the lower part of the front part of the second mold piece 9 so that the surface facing the cylindrical mold 2 side is an inclined surface extending rearward as going downward. A mold opening lower ring 12 as an outer mold disassembling member in which the upper part of the outer peripheral surface is formed on a tapered surface having the same taper ratio as the inclined surface is disposed below the lower part in the state of FIG. When the opening lower ring 12 is raised (the lifting means is not shown), the upper portion of the outer peripheral surface comes into contact with the inclined surface of the lower cutout 9b of the second mold piece 9 to apply a vertical external force. The two mold pieces 9 are pushed outward. In other words, the second mold piece 9 has a mechanism for retreating by receiving an outward force at two upper and lower portions to release the outer mold. The mold opening upper ring 11 and the mold opening lower ring 12 are configured to simultaneously contact all the second mold pieces 9,
The outer mold can be easily released.

The upper mold opening ring 11 and the lower mold opening ring 12 are lowered or raised so as to interlock with each other to retreat the second mold piece 9, and at this time, the mold clamping ring 10 is also raised together. It is supposed to. Conversely, mold closing ring 1
When the second mold piece 9 moves forward by lowering 0, the mold opening upper ring 11 rises and the mold opening lower ring 12 descends in conjunction therewith.

FIG. 2 shows the first mold piece 6. First mold piece 6
Are radially arranged at intervals so as to surround the tension band precursor formed on the outer peripheral surface of the cylindrical mold,
It is formed in a plate shape. A lower projection 6a is provided at a lower portion of the first mold piece 6, and an upper projection 6b is provided at an upper portion thereof. The lower projection 6a is formed on an upper surface of a lower flange provided at the bottom of the heating jacket. Fits in the groove of
The upper protrusion 6b is fitted and fixed in an annular groove provided on the lower surface of the upper flange provided above the heating jacket. The first mold piece 6, the upper flange, and the lower flange allow the side wall to extend 20 parallel to the axis.
An outer mold frame provided with four long holes is formed. At this time, the front surface 6c of the first mold piece 6 constitutes a part of the inner peripheral surface of the outer mold frame that contacts the outer peripheral surface of the tension band precursor. The first mold piece 6 is formed to be thicker from the front surface 6c to the rear, so that the width of the long hole formed between the first molds 6 is uniform.

FIG. 3 shows the second mold piece 9. Second mold piece 9
Is inserted into a long hole formed between the first mold pieces of the outer mold frame. The front portion 9c of the second mold piece 9 is formed in a “convex” shape in cross section, and when this protrudes toward the cylindrical mold side of the long hole of the outer mold frame, tension is applied to the outer peripheral surface of the tension band precursor. An outer groove having a “concave” shape in cross section, which becomes the upper groove of the band, is formed. The thickness of the second mold piece 9 is substantially equal to the width of the long hole,
Both side faces of the second mold piece 9 are guided in contact with the side faces of the adjacent first mold piece, so as to advance and retreat in the elongated hole. Accordingly, when the second mold piece 9 is retracted, no gap is generated between the adjacent first mold pieces, and rubber or canvas is sandwiched between the mold pieces, or the rubber flows out. appear,
The occurrence of such a problem is suppressed. Also, the second mold piece 9
The rear surface portion 9d of the rear surface has an inclined surface formed so as to extend outward as it goes downward. Then, the mold closing ring as the outer mold forming member descends, and a vertical external force acts on the back surface 9d, the second mold piece 9 is pushed forward and the outer mold is formed. Becomes Further, an upper cutout portion 9a formed on an inclined surface extending rearward as going upward is provided at an upper portion of the front portion 9c of the second mold piece 9. Then, the mold opening upper ring as an outer mold disassembling member descends, comes into contact with the inclined surface of the upper cutout 9a, and a vertical external force acts, whereby the second mold piece 9 is pushed outward. It will be. Similarly, a lower cutout 9b formed on an inclined surface extending rearward downward is provided at a lower portion of the front portion 9c of the second mold piece 9. And
The mold opening lower ring as an outer mold disassembling member rises, comes into contact with the inclined surface of the lower notch 9b and is given a vertical external force, and the second mold piece 9 is pushed outward. Become.
Then, the second mold piece 9 is retreated by these two external forces, and the outer mold is released.

FIG. 4 shows a cylindrical outer die formed by alternately arranging the first die pieces 6 and the second die pieces 9. The outer mold is formed by inserting second mold pieces 9, 9,... Into respective long holes of the outer mold frame formed by the first mold pieces 6, 6,. That is, the first mold pieces 6, 6,... Are in a fixed state, and the second mold pieces 9, 9,.
The elongated hole formed therebetween can be advanced and retracted in the radial direction. Here, the first mold pieces 6, 6,... Are formed to be thicker toward the outside in the radial direction, and the elongated holes formed between the adjacent first mold pieces 6, 6 are formed. The intervals are uniform. Then, the second mold pieces 9, 9, ...
Has a thickness substantially equal to the interval between the long holes,
The second mold pieces 9, 9,... Can move forward and backward in the radial direction while being guided by the side faces of the first mold pieces 6, 6,. Thus, when the second mold pieces 9, 9,... Are retracted, no gap is generated between the adjacent first mold pieces 6, 6,..., And rubber or canvas is sandwiched between the mold pieces. In addition, the occurrence of problems such as the occurrence of burrs due to rubber leakage or the like is suppressed. The front portions of the second mold pieces 9, 9,... Are formed in a “convex” shape in cross section, and project from the inner peripheral surface of the outer mold frame, thereby forming a tension band on the outer peripheral surface of the tension band precursor. Is formed so as to form an outer groove having a “concave” cross-section, which is to be the upper surface groove.

Next, the mechanism for moving the second mold piece 9 forward and backward will be described.

When the cylindrical mold 2 formed on the outer peripheral surface of the tension band precursor 3 is inserted into the outer mold frame formed by the first mold piece 6 and molded and vulcanized, FIG. As shown in (a), the mold opening upper ring 11 is raised and the mold opening lower ring 12 is lowered, so that the inner peripheral surface of the mold closing ring 10 is in the second position.
When the mold piece 9 is lowered so as to come into contact with the back surface, the second
A vertical downward external force is applied to the back surface of the mold piece 9. Then, the second mold piece 9 advances toward the cylindrical mold 2 to form an outer mold.

After the completion of the molding vulcanization, as shown in FIG. 5 (b), the mold closing ring 10 is raised, and the outer peripheral surface of the mold opening upper ring 11 becomes the upper cutout 9a of the second mold piece 9. When the mold opening upper ring 11 is lowered so as to come into contact with the inclined surface, a vertical downward external force is applied to the inclined surface. Similarly, when the mold opening lower ring 12 is raised so that the outer peripheral surface of the mold opening lower ring 12 comes into contact with the inclined surface of the lower cutout portion 9b of the second mold piece 9, the vertical upward external force is applied to the inclined surface. Will join. Then, the second mold piece 9 is retracted by the action of both external forces, the outer mold is released, and the cylindrical mold 2 can be detached. (Embodiment 2) A method of manufacturing a high-load transmission V-belt including a method of manufacturing a tension band according to Embodiment 2 of the present invention will be described with reference to FIG. <First material setting step> A rubber mold having elasticity in the circumferential direction and rubber glue is provided on a cylindrical mold having semicircular cross-sectional projections extending in parallel with the axial direction on the outer peripheral surface at a predetermined pitch in the circumferential direction. Is covered with a cylindrical first nylon canvas which has been subjected to an adhesive treatment.

Next, a sheet of a rubber composition containing hydrogenated nitrile rubber (H-NBR) as a main component is wound on the first nylon canvas.

At this time, the canvas and the rubber are arranged in layers on the outer peripheral surface of the cylindrical mold in this order. <Pressurizing step> A cylindrical mold in which the first nylon canvas and rubber are set as described above is placed in a vulcanizing can, a predetermined pressure is applied for a predetermined time, and the canvas and rubber are pressed against the cylindrical mold. To form a canvas-rubber composite. At this time,
An inner groove corresponding to a ridge having a semicircular cross section provided on the outer peripheral surface of the cylindrical mold is formed on the peripheral surface of the inside of the canvas / rubber composite, and this is the lower surface groove of the tension band. <Cutting process> The canvas / rubber composite was removed from the cylindrical mold, and a 2
It runs around both rollers of the shaft belt traveling device. Then, a blade is applied to the rubber surface, the blade is scanned in the axial direction of the roller, and the rubber on the outer peripheral surface of the canvas / rubber composite is cut to obtain a predetermined rubber thickness. <Second material setting step> The rubber-canvas composite whose rubber surface has been cut is set again in a cylindrical mold, and a core wire made of aromatic polyamide fiber and subjected to an adhesive treatment is spirally formed at a predetermined pitch. Wrap in a shape.

Next, from above, the same hydrogenated nitrile rubber (H-NBR) as used in the first material setting step was used.
Is wound around a rubber sheet.

Then, a cylindrical second nylon canvas which has elasticity in the circumferential direction and has been subjected to an adhesive treatment with rubber glue is covered from above.

Through the above steps, a tension band precursor 3 composed of canvas, rubber and a core wire is formed on the outer peripheral surface of the cylindrical mold 2. <Cylindrical mold setting step> The rubber press upper flange 2b is attached to the cylindrical mold 2 on which the tension band precursor 3 is formed,
It is installed in the heating jacket 1 of the tension band forming vulcanizing apparatus according to the first embodiment. At this time, the lower tapered portion 2 a of the cylindrical mold 2 is fitted into the lower rubber holding flange 4 in the heating jacket 1, and the positioning small protrusions 5, 5 are formed in the positioning holes provided in the bottom of the cylindrical mold 2. Is fitted. Thereby, a ridge provided on the outer peripheral surface of the cylindrical mold 2,
The ridges provided on the mold pieces 6, 6,... Are opposed to each other, and the inner groove serving as the lower surface groove and the outer groove serving as the upper surface groove of the tension band are formed in the tension band precursor 3 correspondingly. The Rukoto. <Mold vulcanization step> The mold fixture 13 is lowered to fix the cylindrical mold 2. Then, the mold opening upper ring 11 is moved up, the mold opening lower ring 12 is moved down, and the mold closing ring 10 is moved down so that the inner peripheral surface comes into contact with the back surface of the second mold piece 9. As a result, the rear surface of the second mold piece 9 receives a vertical downward external force, which acts as a thrust for advancing the second mold piece 9. Then, the first mold piece 6 and the second mold piece 9 contact the outer peripheral surface of the tension band precursor 3 to form an outer mold that covers the outer surface.

In this manner, the tension band precursor 3 is sealed by the outer mold formed by the cylindrical mold 2 and the mold piece 7, the rubber holding upper flange 2b, and the rubber holding lower flange 4. Become.

The temperature of the cylindrical mold 2 and each mold piece 7 rises by filling the inside of the vulcanizer with steam at a predetermined temperature and pressure, and the state is maintained for a predetermined time to obtain a predetermined vulcanization degree. By vulcanizing the rubber up to this point, a vulcanized tension band precursor 3 formed of rubber and fibers is formed. At this time, since the protrusions are formed at a predetermined pitch in the circumferential direction so as to extend in the axial direction on the inner peripheral surface of the outer mold, the cross-section “concave” corresponding to the protrusions is formed on the outer peripheral surface of the tension band precursor 3. A U-shaped outer groove is formed, which becomes the upper surface groove of the tension band.

Next, the mold closing ring 10 is raised, and the mold opening upper ring 11 is lowered so that the outer peripheral surface thereof comes into contact with the upper notch 9a of each second mold piece 9, and the upper notch is formed. An external force is exerted vertically downward on the inclined surface 9a, and similarly, the mold opening lower ring 12 is raised so that the outer peripheral surface thereof contacts the lower notch portion 9b of the second mold piece 9, and the lower notch portion is similarly raised. An external force is exerted on the inclined surface 9b vertically upward. Then, the second mold piece 9 retreats due to the action of both of these external forces, the outer mold is released, and when the mold fixture 13 is further raised, the cylindrical mold 2 is lifted.
Can be detached.

Then, the cylindrical mold 2 is taken out of the heating jacket 1, and the vulcanized tension band precursor 3 is released from the mold. <Width cutting and chamfering step> The demolded tension band precursor 3 is cut into a ring having a predetermined width, and further chamfered so as to have a predetermined cross-sectional shape. In this way, the tension band of the high-load transmission V-belt is manufactured.

As shown in FIG. 6, the tension band has an upper surface covered with an upper canvas 21, a lower surface covered with a lower canvas 22, and a space between the upper and lower canvases 21 and 22. Shape rubber 23 is filled, and a cord 24 is buried at the center in the belt thickness direction so as to extend in the belt longitudinal direction. An upper surface groove 25 having a “concave” cross section is formed on the upper surface of the tension band so as to extend in the belt width direction, and a lower surface groove 2 having a semicircular cross section so as to extend in the belt width direction also on the lower surface.
6 are formed. The upper surface groove 25 corresponds to the one formed by the ridge provided on the mold piece, and the lower surface groove 26 corresponds to the one formed by the ridge provided on the outer peripheral surface of the cylindrical mold. <Assembly process> The upper edge of the fitting portion of the block provided with a long hole-shaped fitting portion penetrating in the belt length direction on both sides so as to extend in the belt width direction is formed on the upper surface groove of the tension band. Further, the lower edge portion is engaged with the lower surface groove and attached to each other, thereby obtaining a high load transmission V-belt as shown in FIG.

According to the method of manufacturing the tension band in the method of manufacturing the high load transmission V-belt, since the upper surface groove of the outer peripheral surface of the tension band is formed by the mold, it is necessary to replace the rubber sleeve as in the prior art. There is no need for maintenance. Further, since the upper surface groove is formed by a mold, the shape accuracy is improved more than before. (Other Embodiments) In Embodiments 1 and 2 described above, the forming and vulcanizing apparatus and the manufacturing method of the tension band of the V belt for high-load transmission are used. However, the present invention is not particularly limited thereto. In addition to a double-sided toothed belt having belt teeth formed on both sides, a molding vulcanizing apparatus and a manufacturing method for a power transmission belt having cogs on both surfaces of the belt may be used.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a vulcanizing apparatus for forming a tension belt of a high-load transmission V-belt according to a first embodiment of the present invention.

FIG. 2 is a (a) top view and (b) a side view of a first mold piece.

3A is a top view and FIG. 3B is a side view of a second mold piece.

FIG. 4 is a top view of a cylindrical hole formed by alternately arranging first mold pieces and second mold pieces.

FIG. 5 is a diagram showing a (a) mechanism for moving forward and (b) a mechanism for retracting the second mold piece.

FIG. 6 is a side view of the tension band of the high-load transmission V-belt.

FIG. 7 is a perspective view of a high-load transmission V-belt.

FIG. 8 is a side view of the high load transmission V-belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating jacket 2 Cylindrical mold 2a Tapered part 2b Upper flange of rubber press 3 Tension band precursor 4 Lower flange of rubber 5 Small positioning protrusion 6 First mold piece 6a Lower protrusion 6b Upper protrusion 7 Lower flange 8 Upper flange 9 2 Mold piece 9a Upper cutout 9b Lower cutout 9c Front 9d Back 10 Mold closing ring 11 Mold opening upper ring 12 Mold opening lower ring 13 Mold fixture 21 Upper canvas 22 Lower canvas 23 Shape rubber 24 Core wire 25 upper surface groove 26 lower surface groove a tension band b block c upper surface groove d lower surface groove e upper edge f lower edge

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29L 29:00 B29L 29:00 F term (Reference) 4F202 AG05 AG16 AH12 CA27 CB01 CK11 CK42 CK73 CN01 4F203 AG05 AG16 AH12 DA11 DB01 DC01 DL14 4F213 AG05 AG16 AH12 WA39 WA55 WA87 WA97 WB01 WC01 WK03

Claims (4)

[Claims] 1. A cylindrical mold detachably provided, and a slot having a uniform width, which is formed so as to surround the cylindrical mold, and penetrates a side wall in a direction toward an axis of the cylindrical mold. A plurality of outer mold frames provided at a predetermined pitch in a circumferential direction, and a gap is formed between the outer mold frames which are fitted in the elongated holes and are horizontally movable in a direction toward the axis, and are laterally movable. Outer peripheral surface of a rubber belt precursor provided on the outer peripheral surface of the cylindrical mold by being formed to have a thickness substantially equal to the width of the long hole so as not to protrude from the inner peripheral surface of the outer mold frame. The outer die is provided with a ridge for covering the belt precursor in contact with the inner peripheral surface and forming a predetermined groove on the outer peripheral surface of the belt precursor at a predetermined pitch in the circumferential direction. A mold piece formed by a mold; and the outer metal for vulcanizing the rubber of the belt precursor to a predetermined degree of vulcanization. Heating means for heating the mold and the mold pieces; an advance mechanism for advancing the mold pieces in the direction toward the axis so that the outer mold is formed; and the cylindrical mold after completion of the molding and vulcanization. And a retreat mechanism for retreating the mold piece in a direction away from the shaft so that the mold can be detached. 2. An inclined surface provided on a mold piece so as to extend in a direction opposite to the cylindrical mold side and extend outwardly in the axial direction of the cylindrical mold, The belt forming vulcanizing apparatus according to claim 1, further comprising: an outer mold forming member that applies the external force to the inclined surface in the axial direction to advance the mold piece. 3. An inclined surface formed on a mold piece so as to extend toward the cylindrical mold side and extend outwardly in the axial direction of the cylindrical mold; The belt molding vulcanizing apparatus according to claim 1 or 2, further comprising: an outer mold disassembling member that applies an external force to the surface to retreat the mold piece. 4. A method for producing a belt in which an irregular shape is formed on an outer peripheral surface of a belt by using a belt forming vulcanizing apparatus, the belt forming vulcanizing apparatus comprising: a cylindrical mold removably provided; An outer mold formed so as to surround a mold, and provided on the side wall with a large number of long holes of uniform width extending in the axial direction of the cylindrical mold and penetrating in the direction toward the axis at a predetermined pitch in the circumferential direction. A frame, a mold piece fitted into the long hole and formed to have a thickness substantially equal to the width of the long hole so that no gap is formed between the side surface of the long hole and the mold piece; A step of providing a rubber belt precursor on the outer peripheral surface of the cylindrical mold, and fitting the cylindrical mold provided with the belt precursor to the outer mold frame. Installing the vulcanization molding device at a predetermined position in the vulcanization molding apparatus; The mold piece is protruded from the inner peripheral surface of the outer mold frame by advancing toward the axis of the outer mold frame, and comes into contact with the outer peripheral surface of the belt precursor to cover the belt precursor and the inner peripheral surface of the belt precursor. A step of forming an outer mold in which protrusions for forming a predetermined concave groove on the outer peripheral surface of the body are provided at a predetermined pitch in the circumferential direction by the outer mold frame and the mold pieces; A step of heating the mold piece and vulcanizing the rubber to a predetermined degree of vulcanization so that a predetermined concave groove is formed on the outer peripheral surface of the belt precursor by the ridge provided on the inner peripheral surface, A step of retreating said mold piece in a direction away from said axis to release said outer mold in order to attach and detach said cylindrical mold.