JP3468270B2 - Toothed belt - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothed belt used as a timing belt or a synchronous belt, and in particular, it rotates from a crankshaft to a camshaft, a balancer shaft, a drive shaft of a fuel injection pump in a prime mover of a vehicle such as an automobile. The present invention relates to a toothed belt used as a power transmission belt for transmitting a driving force.

[0002]

2. Description of the Related Art Conventionally, a toothed belt generally has a tooth rubber layer, and tooth portions and tooth bottom portions are alternately formed on one surface of the tooth rubber layer. A back rubber layer is integrally applied to the other surface of the tooth rubber layer, and a core wire is embedded in the boundary surface between the tooth rubber layer and the back rubber layer. In recent years, as the performance of prime movers of vehicles such as automobiles has increased, the rotational speed of the crankshaft has increased, and the toothed belt used for rotationally driving auxiliary machinery shafts such as cam shafts and injection pump shafts has a greater load. It will hang.

[0003]

As the load increases, the tooth chips in the toothed belt are prematurely chipped. It is possible to widen the belt width as a measure to prevent this early tooth chipping, but the belt width of the toothed belt is limited due to the mounting conditions of the prime mover of vehicles such as automobiles, so it is necessary to widen the belt width unnecessarily. You can't do it. Therefore, it is not possible to deal with the above-mentioned problem of early loss of the tooth portion by widening the belt width of the toothed belt.

An object of the present invention is to provide a toothed belt of the type described above, which is configured to solve the problem of premature tooth loss without widening the belt width. is there.

[0005]

SUMMARY OF THE INVENTION A toothed belt according to the present invention comprises a tooth rubber layer having tooth and root portions alternately formed on one surface thereof. A canvas is provided so as to cover the tooth portion and the tooth bottom portion of the tooth rubber layer, and the back rubber layer is integrally applied to the other surface of the tooth rubber layer. A plurality of core wire elements are interposed on the boundary surface between the tooth rubber layer and the back rubber layer, and these core wire elements extend along the length direction of the toothed belt and are arranged along the width direction thereof. . According to the present invention, such a toothed belt is characterized in that a large number of short fibers are mixed in the tooth rubber layer throughout the tooth rubber layer and are regularly oriented.

[0006] Preferably, the short fibers are oriented in the longitudinal direction of the toothed belt. In this case, the short fibers are oriented along the contour surface in the region close to the alternate contour surfaces of the tooth portion and the tooth bottom portion of the tooth rubber layer, and at this time, the short fiber is oriented in the central region of the tooth portion of the tooth rubber layer. It can be oriented substantially perpendicular to the plane of the back rubber layer. On the other hand, the short fibers may be oriented in the width direction of the toothed belt.

In the present invention, the short fibers are preferably aramid short fibers, and the aramid short fibers may be either meta-aramid short fibers or para-aramid short fibers. The length of the short fibers may be about 1 to about 6 mm, preferably about 3 mm. Also, about 3 to about 30 parts by weight of short fibers may be mixed with 100 parts by weight of the raw rubber of the tooth rubber layer, but preferably about 6.5 parts by weight of short fibers are mixed.

In the present invention, as a raw material rubber used for the tooth rubber layer and the back rubber layer, a hydrogenated nitrile rubber having a hydrogenation rate of 91% or more is used, and a peroxide type vulcanizing agent is used as the raw material rubber. May be added, or a sulfur-based vulcanizing agent and a vulcanization accelerator may be added.

In the present invention, preferably, the canvas is preformed such that when the canvas is stretched and ruptured, its elongation is about 30 to about 80% of its original length. Further, the canvas may be composed of a stretchable composite yarn extending along the longitudinal direction of the toothed belt and a non-stretchable yarn extending along the width direction of the toothed belt. In addition, the canvas can be treated with a resorcinol-formaldehyde-latex solution.

In the present invention, the core elements may be formed from high strength glass fibers, wherein the core elements may be arranged with a gap of about 0.17 to about 0.28 mm. The core elements may also be formed from aramid fibers, where the core elements may be arranged with a gap of about 0.25 to about 0.36. Preferably, the core element is treated with a resorcinol-formaldehyde-latex solution, and an overcoat layer of a rubber paste solution is further formed on the core element, and a cashew-modified phenolic resin layer is preferably formed on the overcoat layer. Can be formed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a toothed belt according to the present invention will be described with reference to the accompanying drawings.

Referring first to FIG. 1, a first embodiment of a toothed belt according to the present invention is generally indicated by the reference numeral 10 in which a portion cut away from the toothed belt 10 is shown in perspective. It is illustrated as a figure. The toothed belt 10 includes a tooth rubber layer 12, and tooth portions 14 and tooth bottom portions 15 are alternately and integrally formed on one surface of the tooth rubber layer 12. Further, the toothed belt 10 has a back rubber layer 16 integrally applied to the other surface of the tooth rubber layer 12, and a plurality of cores embedded in a boundary surface between the tooth rubber layer 12 and the back rubber layer 16. And a line element 18. Such a large number of core wire elements 18 are obtained, for example, by spirally winding a pair of core wire cords along the length direction of the toothed belt 10. In addition,
Preferably, one of the pair of core cords is an S twist core cord and the other core cord is a Z twist core cord. The toothed belt 10 further includes tooth portions 14 of the tooth rubber layer 12.
And a canvas 20 applied to the face of the tooth bottom 15, which canvas 20 is preferably formed as a woven fabric of aramid and nylon fibers, as will be explained in more detail below.

As shown in FIG. 1, a large number of short fibers 22 are mixed into the tooth rubber layer 12 substantially evenly throughout the tooth rubber layer 12, and the short fibers 22 are regularly distributed in the tooth rubber layer 12. That is, in the embodiment shown in FIG. 1, the short fibers 22 are oriented along the length direction of the toothed belt 10 in a region close to the surfaces of the tooth portions 14 and the tooth bottom portions 15 of the tooth rubber layer 12. Further, in the central region of each tooth portion 14, the short fibers 2
2 is oriented so as to be perpendicular to the surface of the back rubber layer 16. In any case, in the first embodiment shown in FIG. 1, the short fibers 22 are oriented in a direction perpendicular to the generatrices forming the contour surfaces of the tooth portion 14 and the tooth bottom portion 15 of the tooth rubber layer 12.

FIG. 2 is an enlarged view of the cut surface of the tooth bottom portion 15 shown in FIG. As shown in FIG.
In FIG. 5, the core element 18 is shown in contact with the canvas 20, but in reality, the core element 18 and the canvas 2 are not shown.
A thin rubber layer, which is a part of the tooth rubber layer 12, is interposed between 0 and 0. As described above, the core element 18 is the tooth rubber layer 1
2 is embedded in the boundary surface between the back rubber layer 16 and at this time, a part of each core wire element 18 is embedded in the tooth rubber layer side including the short fibers 22, and the other part of each core wire element 18 is embedded. Is embedded on the back rubber layer 16 side. In the present embodiment, the embedding depth J of each core wire element 18 on the tooth rubber layer 12 side is approximately one third of the diameter d, and the embedding depth L of each core wire element 18 on the back rubber layer 16 side. Is approximately two-thirds of its diameter d. In short, part of the tooth rubber layer 12, that is, rubber mixed with short fibers, partially penetrates into the gap between the core elements 18 adjacent to each other.

As shown in FIG. 2, the plurality of core wire elements 18 are arranged so as to have a predetermined gap g therebetween, and the gap g
Can be appropriately changed according to the material of the core element 18. For example, when the core element 18 is formed of high strength glass fiber, the gap g between the plurality of core elements 18 is about 0.
In the range of 17 to about 0.28 mm, and when the core element 18 is made of aramid fiber, the gap g between the plurality of core elements 18 is in the range of about 0.25 to about 0.36 mm. .

Referring to FIG. 3, there is shown a second embodiment of a toothed belt according to the present invention, in which same reference numerals are used for components corresponding to those of the toothed belt shown in FIG. Are shown using. In the second embodiment, the second embodiment is substantially the same as the first embodiment except that the short fibers 22 in the tooth rubber layer 12 are oriented in a direction different from that of the first embodiment. Are the same. In short, in the second embodiment, the short fibers 22 are oriented along the width direction of the toothed belt 10, and therefore the orientation of the short fibers 22 is such that the tooth portion 14 and the tooth bottom portion 15 of the tooth rubber layer 12 are oriented. Is parallel to the generatrix forming the contour surface of.

Here, for convenience of explanation, in the following description,
The orientation of the short fibers 22 in the tooth rubber layer 12 is the toothed belt 10
In the longitudinal direction of the toothed belt 10 (first embodiment), the orientation of the short fibers 22 in the tooth rubber layer 12 is oriented in the belt longitudinal direction (first embodiment). 2 embodiment), which will be referred to as belt widthwise orientation.

In both the first and second embodiments, the short fibers 22 are preferably made of aramid fibers, and the aramid short fibers may be either meta-aramid fibers or para-aramid fibers. Regarding the amount of the short fibers 22 mixed in the tooth rubber layer 12, 100 parts of raw rubber (phr:
parts per hundred parts rubber) to about 3 to about 30 parts (phr), preferably about 6.3 parts (phr)
The ratio of Further, as the raw material rubber, hydrogenated nitrile rubber is preferably used, and vulcanization of the hydrogenated nitrile rubber is not particularly limited, but vulcanization with organic peroxide or vulcanization with sulfur or the like is preferable.

It is generally known that when short fibers are mixed with hydrogenated nitrile rubber and vulcanized, its elasticity is lost and its hardness is increased. On the other hand, it is known that when carbon black is added to hydrogenated nitrile rubber and vulcanized, its elasticity is high. Therefore, the tooth rubber layer 1
In order to obtain a desired elasticity or hardness when a predetermined amount of the short fibers 22 is mixed with respect to 2, the addition amount of carbon black may be adjusted. Since the internal heat generation during running of the toothed belt 10 is deeply related to the elastic modulus of the tooth rubber layer 12, carbon black is used as the toothed belt 10.
It can also function as a regulator for suppressing internal heat generation during running.

In the first and second embodiments, the canvas 20 is made of a woven cloth twilled with a composite yarn along the length direction of the toothed belt 10 and a non-stretchable yarn along the width direction of the toothed belt 10. It may be formed, but may also be formed by other woven fabrics, such as satin weave, plain weave or woven fabrics obtained by various modified weaves.

The composite yarn of the canvas 20 can be composed of, for example, a core yarn, a spun yarn wound around the core yarn, and a crimped yarn further wound on the outer side of the core yarn in the opposite direction to the winding of the spun yarn. . The core yarn is preferably a polyurethane elastic yarn, the spun yarn is preferably an aramid fiber having excellent heat resistance, and the crimped yarn is preferably an aliphatic synthetic nylon fiber having excellent abrasion resistance. Can be used. On the other hand, the non-stretchable yarn of the canvas 20 is preferably excellent in rigidity and heat resistance, and for example, nylon fiber filament yarn or the like is suitable.

As described above, in the canvas 20, the toothed belt 1
A composite yarn having elasticity along the length direction of 0 is used,
On the other hand, non-stretchable yarn is used along the width direction of the toothed belt 10. Therefore, the canvas 20 is provided with elasticity along the length direction of the toothed belt 10.

Next, a method of manufacturing the toothed belt 10 will be described with reference to FIGS.

First, as shown in FIG. 4, a preformed toothed drum 24 is prepared, and a tooth portion 26 is provided around the drum 24. Further, the preformed toothed drum 24 has a toothed roller 2
8 is engaged and the toothed roller 28 is provided with a toothing 30 which cooperates with the toothing 26 of the preforming toothed drum 24. The preformed toothed drum 24 and toothed roller 28 are rotated in the directions indicated by arrows A and B, respectively.

The canvas material 20 'is fed to the preforming drum 24 so as to surround a part of the circumference of the preforming drum 24 and introduced into the engagement region with the toothed roller 28, at which time the canvas material 20' is introduced. It is preformed into a corrugated shape by the cooperating action of both teeth 26 and 30. The canvas material 20 'has the same woven fabric structure as the canvas 20 described above, and finally becomes the canvas 20 of the toothed belt 10. The supply of the canvas material 20 'to the preformed toothed drum 24 is performed so that the stretchable composite yarn is in a direction perpendicular to the rotation axis of the preformed toothed drum 24.

As shown in FIG. 5, the preformed toothed drum 2
A steel belt 32 is applied to a part of the periphery of 4 with an appropriate pressing force and is run at the same speed as the peripheral speed of the preforming toothed drum 24. The compounded rubber sheet 12 'is supplied between the preformed toothed drum 24 and the steel belt 32, whereby the preformed canvas material 20' and the compounded rubber sheet 12 'are integrated. That is, compounded rubber sheet 1
2'is pressed by the steel belt 32 and preformed according to the shape of the canvas material 20 'after preforming. In short, an intermediate product in which the preformed canvas material 20 'and the compounded rubber sheet 12' preformed according to the preforming are integrated is obtained.

Tooth portions 14 'and tooth bottom portions 15' are alternately formed on the preformed compounded rubber sheet 12 ', and these tooth portions 14' and tooth bottom portions 15 'are the tooth portions 14 of the finishing toothed belt 10. And a tooth rubber layer 12 composed of the tooth bottom portion 15. A large number of short fibers are mixed and distributed in the compounded rubber sheet 12 'before preforming, and the whole short fibers are oriented substantially in one direction.

With respect to the preformed toothed drum 24 in such a manner that the short fibers in the compounded rubber sheet 12 'form an angle of approximately 90 degrees with respect to the axis of rotation of the preformed toothed drum 24. Is introduced, the intermediate product is the toothed belt 10 as shown in FIGS. 1 and 2, that is, the toothed belt 10 in which the orientation of the short fibers 22 is oriented in the belt length direction (first embodiment). Used in the manufacture of.

On the other hand, the blended rubber sheet 12 'is formed on the preformed toothed drum 24 in such a manner that the short fibers in the blended rubber sheet 12' are substantially parallel to the rotation axis of the preformed toothed drum 24. When introduced, the intermediate product is a toothed belt 10 as shown in FIG. 3, that is, the toothed belt 10 in which the orientation of the short fibers 22 is oriented in the belt width direction (second belt).
Embodiment).

After the above-mentioned intermediate product is sequentially cut into a predetermined length, the cut intermediate product is wrapped around the toothed belt forming drum 34 as shown in FIG. 6, with the cutting edges being brought into contact with each other. To be On the toothed belt forming drum 34, tooth portions 36 and tooth bottom portions 38 are alternately formed,
The contour shape of the tooth portion 36 matches the contour shape of the tooth bottom portion 15 of the finishing toothed belt 10, and the contour shape of the tooth bottom portion 38 matches the contour shape of the tooth portion 14 of the finishing toothed belt 10.

Subsequently, a pair of core cords 18 'are spirally wound around the cut intermediate product wound around the toothed belt forming drum 34 as shown in FIG. One of ′ is an S-twisted cord, and the other cord is a Z-stranded cord. The pair of core cords 18 'are arranged so as to leave a predetermined gap, and the gap can be appropriately changed depending on the material of the core cord 18'. For example, when the cord 18 'is made of high strength glass fiber, the cord 18' is wound with a gap of about 0.17 to about 0.28 mm, and the cord 18 'is made of aramid fiber. Core cord 18 ', if formed from about 0.25 to about 0.36 mm
It is wrapped so as to leave a gap in the range of. The pair of cords 18 ′ will eventually become a plurality of cord elements 18 in the finishing toothed belt 10.

After the winding of the pair of cords 18 ', the compounded rubber sheet 16' is further wound on the cords, and the compounded rubber sheet 16 'is finally attached to the spine of the finishing toothed belt 10. It becomes the rubber layer 16.

Thereafter, the belt components 12 ', 16',
The toothed belt forming drum 34 with 18 'and 20' is placed in a vulcanization oven (not shown), where it is vulcanized at a predetermined temperature and pressure. As shown in FIG.
There are numerous gaps between the belt components 12 ', 16', 18 'and 20', which are eliminated during the vulcanization process.

After the vulcanization, as shown in FIG. 7, a cylindrical toothed belt slab 10 'is vulcanized around the toothed belt forming drum 34. The toothed belt forming drum 34 is then removed from the vulcanization oven and
From there, the toothed belt slab 10 'is extracted. After grinding the toothed belt slab 10 'with a grinder or the like, the toothed belt slab 10' is cut into an appropriate width in a sliced manner, whereby the toothed belt 10 having a desired belt width can be obtained. It should be noted that in FIG. 7, each component of the toothed belt slab 10 ′ has the same reference number as each component of the finished toothed belt 10.

As is apparent from the above description, in the finished toothed belt 10, the stretchable composite yarn of the canvas 20 extends along the longitudinal direction of the toothed belt 10, and the non-stretchable canvas 20 is stretched. The sex yarn extends along the width direction of the toothed belt 10. In other words, FIGS.
According to the method for manufacturing the toothed belt 10 as shown in FIG. 1, the canvas material 20 ′ is stretched only along the circumferential direction of the preformed toothed drum 24, and the finished toothed belt 10 is obtained.
Since it is preformed in accordance with the tooth profile of the
It is not necessary to give 0 ′ more elasticity than necessary. For example,
The canvas material 20 'is provided with low elasticity so that the elongation when the canvas is stretched and ruptured is 30 to 80% of the original length. Note that, conventionally, since the canvas material is wound around the toothed belt forming drum 34 without being preformed, the canvas material is required to have large elasticity.

The evaluation of the finished toothed belt 10 is evaluated as formability MB, in which the contours of the adjacent tooth portions 14 and the tooth bottom portions 15 of the finished toothed belt 10 are adjacent to each other of the toothed belt forming drum 34. It is determined whether or not the contour shapes of the tooth bottom portion 38 and the tooth portion 36 that are formed match within a predetermined allowable range. In detail, first,
As shown in FIG. 8, the distance BP per pitch is measured along the contour shape of the tooth portions 36 and the tooth bottom portions 38 of the toothed belt forming drum 34 which are alternately provided, and then, FIG.
As shown in, the distance TP per pitch is measured along the contour shapes of the tooth portions 14 and the tooth bottom portions 15 of the finishing toothed belt 10 which are alternately provided. The formability MB is defined as the percentage of the distance TP to the distance BP as shown in the following equation. MB = TP / BP × 100

If the formability MB is 93% or more, the finished toothed belt 10 is evaluated as good, and if the formability MB is less than 93%, the finished toothed belt 10 is judged as defective. To be evaluated.

As shown in Table 1 below, five types of compounded rubber materials A through E to be used in the manufacture of toothed belts
Was prepared.

[Table 1]

In Table 1 above, * 1 to * 9 represent the following items. * 1: Hydrogenation rate is a percentage (%) * 2: Iodine value is an unnamed number * 3: Type of compounding material and parts by weight of compounding material per 100 parts by weight of rubber raw material (unit is phr) * 4: 4, 4 ' -(Α, α-Dimethylbenzyl) diphenylamine (this is NAUGAR from Uniroyal Chemistry)
Available as D445) * 5: Abbreviation for N-isopropyl-N'-phenyl-p-phenylenediamine * 6: Peroxide system consisting of dicumyl peroxide and 1,3-bis (t-butylperoxy-isopropyl) benzene Vulcanizing agent (the former is Die Cup 4 from Hercules)
0C, the latter is available from NOF CORPORATION as Peroximon F40), * 7: Abbreviation of trimethylolpropane / trimethacrylate * 8: Tetramethylthylium disulfide and dipentamethylenethylium tetra. Sulfur vulcanization accelerator consisting of sulfide and N-cyclohexyl-2-benzothiazyl sulfenamide * 9: Abbreviation of tellurium diethyl dithiocarbamate. In the table, "***" indicates unblended.

As is clear from Table 1, compounded rubber material A
Is a hydrogenated nitrile rubber with a hydrogenation rate of 96%, an iodine value of 11 and a Mooney viscosity of 120 or more.
20 parts by weight of carbon black, 10 parts by weight of trimellitate isonolyl, 1.0 part by weight of stearic acid, 1.5 parts by weight of NAUGARD 445, and 25 parts by weight of
18 parts by weight of zinc methacrylate, 10 parts by weight of zinc white,
This is the one to which 6 parts by weight of TMP was added, and 6 parts by weight of peroxide type vulcanizing agent (die cup 40C + peroximon F40). A compounded rubber sheet (A) was obtained from this compounded rubber material A by extrusion molding. Next, after preparing a sample piece for the low elongation region modulus test and a sample piece for the compressive stress test from the compounded rubber sheet (A), the sample pieces were vulcanized.

The compounded rubber material B is the compounded rubber material A further mixed with only 6.5 parts by weight of meta-aramid short fibers having a fiber length of 3 mm. A compounded rubber sheet (B) was also obtained from this compounded rubber material B by extrusion molding, but the short fibers mixed in the compounded rubber material B at this time were oriented in the extrusion direction. Next, after preparing a sample piece for the low elongation region modulus test and a sample piece for the compressive stress test also from the compounded rubber sheet (B), these sample pieces were vulcanized. In the case of the compounded rubber sheet (B), two types of sample pieces for low elongation modulus test are prepared, and in one type of sample piece, the short fibers are oriented parallel to the pulling direction. In the other type of sample piece, the short fibers are oriented at right angles to the pulling direction. Also. Two types of sample pieces for the compressive stress test are also prepared. In one type of sample piece, short fibers are oriented parallel to the compression direction, and in the other type sample piece, the compression The short fibers are oriented at right angles to the direction.

The compounded rubber material C is 60 parts by weight of carbon black and 10 parts by weight with respect to 100 parts by weight of a hydrogenated nitrile rubber having a hydrogenation rate of 92.8%, an iodine value of 21 and a Mooney viscosity of about 78 as a rubber raw material. Of trimellitate isonolyl, 1.0 part by weight of stearic acid, and 1.0 part by weight of I
PPD, 5.0 parts by weight of zinc white, 0.8 parts by weight of sulfur, 2.7 parts by weight of sulfur-based vulcanization accelerator, and 1.0 part by weight of Te-EDC are added. A compounded rubber sheet (C) was also obtained from this compounded rubber material C by extrusion molding. Moreover, after preparing a sample piece for the low elongation region modulus test and a sample piece for the compressive stress test from the compounded rubber sheet (C), these sample pieces were vulcanized.

Compounded rubber material D is the same rubber raw material as compounded rubber material C, 40 parts by weight of carbon black, 10 parts by weight of trimellitate isonolyl, 1.0 part by weight of stearic acid and 1.0 part by weight. Of IPPD, 5.0 parts by weight of zinc white, 0.8 parts by weight of sulfur, 2.7 parts by weight of sulfur-based vulcanization accelerator, and 1.0 part by weight of Te-EDC,
Furthermore, only 6.5 parts by weight of meta-aramid short fibers with a fiber length of 3 mm were mixed. A compounded rubber sheet (D) was also obtained from this compounded rubber material D by extrusion molding, but the short fibers mixed in the compounded rubber material D at this time were oriented in the extrusion direction. After preparing a sample piece for the low elongation region modulus test and a sample piece for the compressive stress test also from the compounded rubber sheet (D), these sample pieces were vulcanized. Also in the case of the compounded rubber sheet (D), as in the case of the compounded rubber sheet (B), two kinds of sample pieces for the low elongation modulus test and the sample piece for the compressive stress test are prepared. It was

The compounded rubber material E is the compounded rubber material A further mixed with only 6.5 parts by weight of para-aramid short fibers having a fiber length of 3 mm. A compounded rubber sheet (E) was also obtained from this compounded rubber material E by extrusion molding, but the short fibers mixed in the compounded rubber material E at this time were oriented in the extrusion direction. After preparing a sample piece for the low elongation region modulus test and a sample piece for the compressive stress test also from the compounded rubber sheet (E), these sample pieces were vulcanized. Also in the case of the compounded rubber sheet (E), as in the case of the compounded rubber sheet (B), two kinds of sample pieces for the low elongation modulus test and the sample piece for the compressive stress test are prepared. It was

Although not shown in Table 1, the compounded rubber material A was prepared by adding 6.5 mm of a meta-aramid short fiber having a fiber length of 3 mm.
A compounded rubber material was also prepared in which only parts by weight were mixed in non-oriented (random direction). A compounded rubber sheet obtained by extrusion molding from this compounded rubber material is referred to below as (F).

Next, the compounded rubber sheet (A) described above,
Using the respective specimens obtained from (B), (C), (D) and (E), low extension zone modulus test and compressive stress test were conducted. The test results of the low extension range modulus test are shown in the graphs of FIGS. 10 and 11, and the test results of the compressive stress test are shown in FIGS. 12 and 13.

In the low extension modulus test, tensile stress was applied to each sample piece at 200 mm / min, and
The elongation between the 40 mm marked lines was measured.

In the graph of FIG. 10, reference numeral A indicates the tensile properties of the sample piece obtained from the compounded rubber sheet (A), and reference numeral B indicates the sample piece obtained from the compounded rubber sheet (B). Shows the tensile properties of a sample piece in which the orientation of the short fibers is parallel to the pulling direction, and the reference numeral B ′ is a sample piece obtained from the compounded rubber sheet (B). The tensile properties of a sample piece whose orientation is perpendicular to the pulling direction are shown, and the reference symbol E is a sample piece obtained from the compounded rubber sheet (E), in which the orientation of the short fibers is relative to the pulling direction. Shows the tensile properties of the sample pieces that are parallel to each other. Reference numeral E'denotes a sample piece obtained from the compounded rubber sheet (E), in which the orientation of the short fibers is perpendicular to the tensile direction. The tensile properties of the specimens are shown.

Further, in the graph of FIG. 11, reference numeral C indicates the tensile properties of the sample piece obtained from the compounded rubber sheet (C), and reference numeral D indicates the sample piece obtained from the compounded rubber sheet (D). And shows the tensile properties of the sample piece in which the orientation of the short fibers is parallel to the tensile direction,
Reference numeral D'denotes a tensile property of a sample piece obtained from the compounded rubber sheet (D), in which the orientation of the short fibers is perpendicular to the tensile direction.

As is apparent from the graphs of FIGS. 10 and 11, compared with the sample pieces obtained from the compounded rubber materials A and C, that is, the sample pieces containing no short fiber, the compounded rubber materials B and D were compared.
It can be seen that the sample pieces obtained from E. and E, that is, the sample pieces containing short fibers, have high modulus values, and the elongation rates of the sample pieces are small. In particular, it can be seen that the sample pieces (B, D and E) containing the short fibers oriented parallel to the tensile direction show a very large modulus value.

In the compressive stress test, each sample piece was 25.4
Each sample piece had a cylindrical shape with a length of mm, and a pressing force was applied between both end faces to compress each sample piece, and the length at the time of compression was measured.

In the graph of FIG. 12, reference numeral A indicates the compression characteristics of the sample piece obtained from the compounded rubber sheet (A), and reference numeral B indicates the sample piece obtained from the compounded rubber sheet (B). , Shows the compression characteristics of a sample piece in which the orientation of the short fibers is parallel to the compression direction, and reference numeral B '.
Is a sample piece obtained from the compounded rubber sheet (B),
The compression characteristic of the sample piece in which the orientation of the short fiber is perpendicular to the compression direction is shown, and the reference symbol E is the sample piece obtained from the compounded rubber sheet (E), and the orientation of the short fiber is The compression characteristic of a sample piece which is parallel to the compression direction is shown, and the reference numeral E ′ is a sample piece obtained from the compounded rubber sheet (E), and the orientation of the short fibers is relative to the compression direction. The compression characteristic of the sample piece which becomes a right angle is shown.

Further, in the graph of FIG. 13, reference numeral C indicates the compression characteristics of the sample piece obtained from the compounded rubber sheet (C), and reference numeral D indicates the sample piece obtained from the compounded rubber sheet (D). And the compression characteristics of the sample piece in which the orientation of the short fibers is parallel to the compression direction are shown, and the reference numeral D ′ is the sample piece obtained from the compounded rubber sheet (D). The compression characteristic of the sample piece in which the fiber orientation is perpendicular to the tensile direction is shown.

As is clear from the graphs of FIGS. 12 and 13, compared with the sample pieces obtained from the compounded rubber materials A and C, that is, the sample pieces containing no short fibers, the compounded rubber materials B and D were compared.
It can be seen that the sample pieces obtained from E. and E, that is, the sample pieces containing short fibers, show high compressive stress values, and the compressibility of these sample pieces is small.

The above-mentioned five types of compounded rubber sheets (A),
By using (B), (C), (D) and (E), five types of toothed belts according to the present invention are manufactured, and these five types of toothed belts are respectively manufactured. Reference is made below to example belts 1, 2, 3, 4 and 5. Further, by using the above-mentioned three types of compounded rubber sheets (A), (C) and (F),
As a comparative example of the toothed belt according to the present invention, four types are manufactured, and these four types of toothed belts are referred to below as comparative belts 1, 2, 3 and 4, respectively.

The structures of the example belts 1 to 5 and the comparative example belts 1 to 4 are as shown in Table 2 below.

[0057]

[Table 2]

Example Belt 1: As is clear from Table 2, in Example Belt 1, the compounded rubber sheet (A) was used as the back rubber layer (16) and the compounded rubber sheet (as the tooth rubber layer (12). B) was used. Tooth rubber layer (12)
The orientation of the meta-aramid short fibers in (1) was oriented in the belt length direction.

Further, in the belt 1 of the embodiment, the canvas (20) is used.
The woven fabric having the above-mentioned structure was used. Specifically, the canvas (20) is a 2/2 twill weave fabric, and the elastic composite yarn is a warp yarn, and its density is
It is 150 / 25mm. Urethane elastic yarn (420 d) is used as a core yarn for each composite yarn, aramid fiber spun yarn (200 d) is wound around the core yarn, and nylon 66 wooly yarn ( 100 d) is wound in the opposite direction to the aramid fiber spun yarn. On the other hand, canvas (2
The density of the non-stretchable weft yarn of 0) is 170 threads / 25 mm. As the non-stretch weft yarn, nylon 66 wooly yarn (100 d) is used.

The canvas (20) was previously treated with a resorcinol-formaldehyde-latex (RFL) solution,
This enhances the adhesiveness to the tooth rubber layer 12.
The RFL solution consists of a carboxylated nitrile rubber as a latex component and a chlorophenol formaldehyde condensate, for example, an ammonia solution of a 2,6-bis-4-chlorophenol derivative.

As the core wire cord 18 ', a pair of S twisted core wire cord and Z twisted core wire cord was used. High-strength glass fiber was used for each cord. More specifically, first, high-strength glass fibers having a diameter of 7 microns were immersed in a latex solution, that is, RFL solution in which butadiene-styrene-vinylpyridine and chlorosulfonated polyethylene latex were mixed at a weight ratio of 7: 3, and then dried. And form an RFL layer for each high strength glass fiber. Next, gather three strands of each of these 200 high-strength glass fibers and twist each to make a twist, and then gather 11 of these strands and twist the twist in the opposite direction to the twist. Use the core cord. The cord is immersed in a rubber paste solution and then dried to form an overcoat layer. After the overcoat layer is formed, it is further dipped in a 25% solution of cashew-modified phenolic resin in methyl ethyl ketone and then dried to form a cashew-modified phenolic resin layer as the outermost layer (see Table 2).

The pair of core cords (S twist and Z twist) thus obtained are used as the toothed belt forming drum 34.
Intermediate product (20 'and 1) wrapped around (Fig. 6)
2 ') 0.26 mm gap between cords ("g" in Figure 2)
It was wound in a spiral shape (see Table 2).

The moldability (MB) of the toothed belt obtained as Example Belt 1 was good as shown in Table 2.

Example Belt 2: As shown in Table 2, in Example belt 2, the compounded rubber sheet (A) was used as the back rubber layer (16) in the same manner as in Example belt 1, and Compounded rubber sheet (B) as the rubber layer (12)
Was used. The example belt 2 is substantially the same as the example belt 1 except that the orientation of the meta-aramid short fibers in the tooth rubber layer (12) is oriented in the belt width direction.
Similar to the example belt 1, in the example belt 2,
The moldability (MB) of the toothed belt was good as shown in Table 2.

Example belt 3: As shown in Table 2, in Example belt 3, the compounded rubber sheet (C) was used as the back rubber layer (16), and the compounded rubber sheet (12) was used as the tooth rubber layer (12). D) was used. Regarding the orientation of the meta-aramid short fibers of the tooth rubber layer (12), the example belt 1 was used.
In the same manner as in (1), the belt was oriented in the belt length direction. The cord 18 'is also made of high-strength glass fiber as in the case of the example belt 1, but as shown in Table 2, in the example belt 3, the high-strength glass fiber itself is RF.
After being treated with the L solution, a lower twist and an upper twist were added to form a cord, and only the overcoat layer was formed on the cord (see Table 2). Other matters are the same as in the case of the example belt 1 as is apparent from Table 2. Similar to the case of Example belt 1, also in Example belt 3, the formability (MB) of the toothed belt was good as shown in Table 2.

Example Belt 4: As shown in Table 2, in the example belt 4, as in the case of the example belt 3, the compounded rubber sheet (C) was used as the back rubber layer (16). Compounded rubber sheet (D) as the rubber layer (12)
Was used. The example belt 4 is substantially the same as the example belt 3 except that the orientation of the meta-aramid short fibers of the tooth rubber layer (12) is oriented in the belt width direction.
As in the case of Example belt 1, also in Example belt 4, the formability (MB) of the toothed belt was good as shown in Table 2.

Example Belt 5: As shown in Table 2, in Example belt 5, the compounded rubber sheet (A) is used as the back rubber layer (16) as in the case of Example belt 1, The compounded rubber sheet (E) was used as the tooth rubber layer (12). In the example belt 4, the para-aramid short fibers of the tooth rubber layer (12) are oriented in the belt length direction. Except for this point, the other matters are substantially the same as those of the example belt 1. Also. Also in the example belt 5, as in the case of the example belt 1, the formability (MB) of the toothed belt was good as shown in Table 2.

Comparative Example Belt 1: In Comparative Example Belt 1, the compounded rubber sheet (A) was used for both the back rubber layer (16) and the tooth rubber layer (12). Other matters are substantially the same as in the case of the example belt 1. Also in the case of the comparative belt 1, as in the case of the example belt 1,
The moldability (MB) of the toothed belt was good as shown in Table 2.

Comparative Example Belt 2: In Comparative Example Belt 2, the compounded rubber sheet (C) was used for both the back rubber layer (16) and the tooth rubber layer (12). Other items are substantially the same as those of the example belt 3 as shown in Table 2. Also in the case of the comparative belt 2, the example belt 1
Similar to the above case, the moldability (MB) of the toothed belt was good as shown in Table 2.

Comparative Example Belt 3: In Comparative Example Belt 3, the compounded rubber sheet (A) is used as the back rubber layer (16) and the compounded rubber sheet (F) is used as the tooth rubber sheet (12).
Was used. The compounded rubber sheet (F) is obtained from the compounded rubber material obtained by mixing the compounded rubber material A with 6.5 parts by weight of the meta-aramid short fibers having a fiber length of 3 mm in a non-oriented (random direction) as described above. It is a thing. Except for this point, the other matters are the same as those of the example belt 2, but in the production of the comparative example belt 3, the canvas material (2
0 ') only was preformed in the manner shown in FIG.
The compounded rubber sheet (F) to be the tooth rubber layer (12) was applied only to the preformed canvas (20 ') wound around the toothed belt forming drum 34 without being preformed.

As shown in Table 2, the moldability (MB) of Comparative Example Belt 3 was less than 93% and was poor. The reason for this is that the compounded rubber sheet (F) to be the tooth rubber layer (12) was not preformed, and the gap between the core wire elements (18) was the same as in the conventional core wire. Another reason is that it was set to 0.26 mm, which is smaller than the gap between elements. In order to obtain good moldability (MB> 93%) without preforming the compounded rubber sheet to be the tooth rubber layer, the gap between the core wire elements must be 0.3 mm or more. .
Furthermore, as another reason, since the orientation of the short fibers contained in the compounded rubber sheet (F) to be the tooth rubber layer (12) is random, the fluidity of the compounded rubber sheet during vulcanization is high. It is also inferior.

In short, when the number of core wire elements is increased by filling the gaps between the core wire elements to give the toothed belt great strength, the formability (MB) of the toothed belt is deteriorated. However, by preforming the compounded rubber sheet to be the tooth rubber layer, good moldability (MB) can be obtained even if the gap between the core elements is 0.3 mm or less.

Comparative Example Belt 4: As is clear from Table 2, the comparative example belt 4 is substantially the same as the comparative example belt 3 except that the gap between the core wire elements is 0.47 mm. . In Comparative Example Belt 4, the gap between the core elements is 0.3 mm.
As described above, the formability of the toothed belt (MB)
Is good.

Example belt 1 obtained as described above
5 to 5 and comparative belts 1, 2 and 4 were run. The comparative example belt 3 had poor formability as described above, and therefore the comparative example belt 3 could not even be subjected to a running test.

Referring to FIG. 14, there is shown a schematic configuration of a first running test apparatus, which is four toothed wheels 51, 52, 53 and 54 and toothed wheels 51 and 52. Idler pulley 55 provided between
And a tensioner 56 provided between the toothed wheels 53 and 54. The toothed belt 59 under test is shown in FIG.
4 toothed wheels 51, 52, in a manner as shown in FIG.
53 and 54, idler pulley 55, and tensioner 5
It is handed over to 6.

In the first running test apparatus shown in FIG. 14, for each of the example belt 1, the example belt 2, the example belt 5 and the comparative example belt 1, a plurality of toothed belts run under the same conditions. For the evaluation of the running test, the running time from the start of running to the lack of teeth was measured for each toothed belt.

The running test results of the example belt 1, the example belt 2, the example belt 5 and the comparative example belt 1 are shown in Table 2 and the graph of FIG. The running time of each toothed belt is an average value. As is clear from Table 2 and the graph of FIG. 16, the running time of the example belt 1 is 404 hours, the running time of the example belt 2 is 400 hours, and the running time of the example belt 5 is 420 hours. there were. On the other hand, the running time of the comparative belt 1 is only 126 hours.

Referring to FIG. 15, there is shown a schematic structure of a second running test apparatus, which is provided with three toothed wheels 61, 62 and 65 and between the toothed wheels 65 and 61. And a tensioner 66 provided. The toothed belt 69 under test is stretched over the three toothed wheels 61, 62 and 65 and the tensioner 66 in a manner as shown in FIG.

In the second running test apparatus shown in FIG. 15, the example belt 1, the example belt 3, the example belt 4, the example belt 5, the comparative example belt 1, the comparative example belt 2 and the comparative example belt 4 are used. For each, a plurality of toothed belts were subjected to a running test under the same conditions, and for the evaluation of the running test, the running time from the start of running to the lack of teeth was measured for each toothed belt. .

The running test results of the example belt 1, the example belt 3, the example belt 4, the example belt 5, the comparative example belt 1, the comparative example belt 2 and the comparative example belt 4 are shown in Table 2 and the graph of FIG. Is shown in. The running time of each toothed belt is an average value. As is clear from Table 2 and the graph of FIG. 17, the running time of Example belt 1 was 321 hours, and the running time of Example belt 3 was
It was 399 hours, the running time of Example belt 4 was 186 hours, and the running time of Example belt 5 was 350 hours. On the contrary, the running times of the comparative belts 1, 2 and 4 are 125 hours, 30 hours and 146 hours, respectively.

As is clear from the above running test results,
It can be seen that the durability of the toothed belt according to the present invention is remarkably improved.

In the above embodiment, the toothed belt has the tooth portions formed on only one side, but it is understood that the present invention can be applied to a two-toothed belt having tooth portions formed on both sides. Should be.

[0083]

As is clear from the above description, in the toothed belt according to the present invention, it is difficult for the tooth portion of the toothed belt to be chipped and the running life thereof can be greatly extended.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a first embodiment of a toothed belt according to the present invention.

2 is a partially enlarged cross-sectional view showing a lateral cross-sectional view of a tooth bottom portion of the toothed belt shown in FIG. 1 in an enlarged manner.

FIG. 3 is a partial side view showing a second embodiment of the toothed belt according to the present invention.

FIG. 4 is a schematic process drawing showing a preforming process of a canvas material in the manufacturing process of the toothed belt according to the present invention.

FIG. 5 is a schematic process diagram showing a preforming process of a tooth rubber sheet in the manufacturing process of the toothed belt according to the present invention.

FIG. 6 is a schematic process diagram showing a core cord winding process and a back rubber sheet winding process in the manufacturing process of the toothed belt according to the present invention.

FIG. 7 is a schematic process drawing showing a vulcanization process in the manufacturing process of the toothed belt according to the present invention.

FIG. 8 is a partial side view of the toothed belt forming drum, showing a contour of a pitch of alternate tooth portions and tooth bottom portions of the toothed belt forming drum for the evaluation of formability of the toothed belt. It is a figure which shows the aspect which measures along.

FIG. 9 is a partial side view of the toothed belt, in which the pitches of alternating tooth portions and tooth bottom portions of the toothed belt are measured along a contour thereof in order to evaluate the formability of the toothed belt. It is a figure which shows the aspect.

FIG. 10 is a graph showing the results of low extension modulus tests performed on five types of sample pieces obtained from three types of vulcanized rubber sheets used in the toothed belt according to the present invention.

11 is carried out on three different specimens used in a toothed belt according to the invention and obtained from two types of vulcanized rubber sheet other than the three types shown in the graph of FIG. It is a graph which shows the result of the low extension range modulus test.

FIG. 12 is a graph showing the results of compressive stress tests performed on five types of sample pieces obtained from three types of vulcanized rubber sheets used in the toothed belt according to the present invention.

FIG. 13 is carried out on three types of specimens obtained from two types of vulcanized rubber sheets used in the toothed belt according to the invention and different from the three types shown in the graph of FIG. It is a graph which shows the result of a compressive stress test.

FIG. 14 is a schematic view of a first running test device for running tests of an example belt and a comparative example belt according to the present invention.

FIG. 15 is a schematic view of a second running test device for running tests of an example belt and a comparative example belt according to the present invention.

16 is a graph showing the results of running test of the toothed belt performed by the first running test device shown in FIG.

FIG. 17 is a graph showing a result of a running test of a toothed belt performed by the second running test device shown in FIG.

[Explanation of symbols]

10 toothed belt 12 Tooth rubber layer 14 teeth 15 Tooth bottom 16 back rubber layer 18 core elements 20 canvas 22 Short fiber

Continuation of the front page (56) Reference JP-A-55-63038 (JP, A) JP-A-7-63241 (JP, A) JP-A-7-91497 (JP, A) JP-A-7-190149 (JP , A) JP-A-2-64132 (JP, A) JP-A-63-235744 (JP, A) Actually opened 61-69542 (JP, U) Actually opened 62-128251 (JP, U) Actually opened 4-48447 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16G 1/00-9/04 B29D 29/00-29/10

Claims (23)

(57) [Claims] 1. A toothed belt comprising a tooth rubber layer, the tooth rubber layer having tooth portions and tooth bottom portions alternately formed on one surface thereof, and further comprising: A canvas provided so as to cover the tooth part and the tooth bottom part, a back rubber layer integrally applied to the other surface of the tooth rubber layer, and an intervening surface between the tooth rubber layer and the back rubber layer. And a plurality of core wire elements extending along the length direction of the toothed belt and arranged along the width direction of the toothed belt. The fibers are layered throughout
Are oriented in a uniform manner, and the short fibers are contoured surfaces of the tooth portion and the tooth bottom portion of the tooth rubber layer.
In the area close to the
Near the center of the cross section of the tooth part of the tooth rubber layer
In the central area, which is the area from the back rubber layer
Is oriented along the direction from the back rubber layer toward the crown
Toothed belt characterized by being. 2. A canvas material is provided with a tooth profile of a predetermined shape on the surface.
Table of preformed toothed drums that are provided drum type members
It is placed on the surface and preformed in a corrugated shape, and then preformed.
On one surface of the canvas material that has been
It is mixed evenly only along the direction and the material of the tooth rubber layer
A compounded rubber sheet comprising:
Depending on the shape, preform by pressing and
Inside the toothed belt, which is the original form of the toothed belt
And between products, the toothed belt intermediate product or the preforming toothed drum
After cutting it off, cut it to the specified length and touch the cutting edges to each other.
Endless toothed belt made by contact
Drum type part with a tooth profile of a predetermined shape on the surface
It is wound around the surface of the toothed belt forming drum, which is the material
Wrap the core element around the outer circumference of the toothed belt intermediate product
In addition, the compound rubber sheet for the back rubber that is the original form of the back rubber layer
A core on the core wire element to integrate the core wire element, the toothed belt intermediate product, the core wire element and the spine element.
Vulcanizes compounded rubber sheet for rubber under specified temperature and pressure
After processing into a toothed belt slab, the toothed bell
Obtained by cutting the toslab into slices of the desired width
The toothed belt is made of a large number of short fibers in the tooth rubber layer.
Be oriented along the width of the toothed belt
Belt with teeth. 3. The toothed belt according to claim 1 or 2 , wherein the short fibers are aramid short fibers. 4. The toothed belt according to claim 3 , wherein the aramid short fibers are meta-aramid short fibers. 5. The toothed belt according to claim 3 , wherein the aramid short fibers are para-aramid short fibers. 6. The toothed belt according to claim 1 , wherein the short fibers have a length of about 1 or less.
A toothed belt characterized by a diameter of about 6 mm. 7. The toothed belt according to claim 6 , wherein the short fiber has a length of about 3 mm . 8. A toothed belt as claimed in any one of up to claims 1 to 7, short fibers of about 3 to about 30 parts by weight per 100 parts by weight of the raw rubber of the tooth rubber layer is mixed Toothed belt characterized by being. 9. The toothed belt according to any one of up to claims 1 to 7, the short fibers of about 6.5 parts by weight for 100 parts by weight of the raw rubber of the tooth rubber layer is mixed Toothed belt characterized by having. 10. The toothed belt according to claim 1 , wherein the raw rubber used for the tooth rubber layer and the back rubber layer has a hydrogenation rate of 91% or more. Toothed belt characterized by being rubber. 11. The toothed belt according to any one of claims 1 to 10 , wherein the tooth rubber layer and the back rubber layer are made of a compounded rubber obtained by adding a peroxide vulcanizing agent to a raw material rubber. A toothed belt characterized by being obtained. 12. The toothed belt according to any one of claims 1 to 10 , wherein the tooth rubber layer and the back rubber layer have a sulfur-based vulcanizing agent and a vulcanization accelerator added to a raw material rubber. A toothed belt characterized by being obtained from a compounded rubber. 13. The toothed belt according to claim 1 , wherein the canvas is preformed. 14. The toothed belt according to claim 13, toothed, characterized in that its elongation when the fabric is broken is extended is about 30 to about 80 percent of the original length belt. 15. The toothed belt according to claim 13 or 14 , wherein the canvas extends along the longitudinal direction of the toothed belt and the stretchable composite yarn extends along the width direction of the toothed belt. A toothed belt, which is characterized by comprising a non-stretchable thread. 16. A toothed belt according to any one of claims 1 to 15 , characterized in that the canvas is treated with a resorcinol-formaldehyde-latex solution. 17. The toothed belt according to claim 1 , wherein the core element is made of high-strength glass fiber. 18. The toothed belt according to claim 17, toothed belt, characterized in that said core wire element are arranged at a gap of about 0.17 to about 0.28 mm. 19. The toothed belt according to claim 1 , wherein the core element is made of aramid fiber. 20. A toothed belt according to claim 19, toothed belt, characterized in that said core wire element are arranged at a gap of about 0.25 to about 0.36 mm. 21. The toothed belt according to claim 1 , wherein the core element is treated with a resorcinol-formaldehyde-latex solution, and further a rubber paste solution is applied onto the core element. A toothed belt , wherein an overcoat layer is formed, and a cashew-modified phenolic resin layer is formed on the overcoat layer . 22. A method of manufacturing a toothed belt, comprising a canvas material, the surface of which is provided with a tooth profile of a predetermined shape.
Is placed on the surface of the preformed toothed drum, which is a
The above-mentioned canvas material preformed in a gate shape and further preformed
On one surface of the material, a large number of short fibers run along the longitudinal direction only.
Compounded rubber that is mixed evenly and becomes the material for the tooth rubber layer
The sheet, depending on the shape of the preformed canvas material,
By preforming by pressing to integrate with the canvas material,
A toothed belt intermediate product, which is the original form of a toothed belt, is used .
After cutting it off, cut it to the specified length and touch the cutting edges to each other.
Endless toothed belt made by contact
Drum type part with a tooth profile of a predetermined shape on the surface
It is wound around the surface of the toothed belt forming drum, which is the material
Wrap the core element around the outer circumference of the toothed belt intermediate product
In addition, the compound rubber sheet for the back rubber that is the original form of the back rubber layer
A core on the core wire element to integrate the core wire element, the toothed belt intermediate product, the core wire element and the spine element.
Vulcanizes compounded rubber sheet for rubber under specified temperature and pressure
After processing into a toothed belt slab, the toothed bell
Tooth slab is cut into a desired width in a sliced manner
Of toothed belts, characterized in that a belt with
Production method. 23. A method for manufacturing a toothed belt, comprising a canvas material, the surface of which is provided with a tooth profile of a predetermined shape.
Is placed on the surface of the preformed toothed drum, which is a
The above-mentioned canvas material preformed in a gate shape and further preformed
On one surface of the material, a large number of short fibers are arranged only in the width direction.
A compounded rubber seal that is evenly mixed and serves as the material for the tooth rubber layer.
The sheet according to the shape of the preformed canvas material.
Preform by pressure and integrate with the canvas material,
Attached to a toothed belt intermediate product is original form of belt, the toothed belt intermediate product or the preforming toothed drum
After cutting it off, cut it to the specified length and touch the cutting edges to each other.
Endless toothed belt made by contact
Drum type part with a tooth profile of a predetermined shape on the surface
Turn only multiplied on the surface of the toothed belt forming drum is wood, the wound cord element on the outer periphery of the toothed belt intermediate products, the core element back Rubber compounding rubber sheet is further original form of the backing rubber layer The toothed belt intermediate product, the core wire element and the spine are wound around and integrated with each other.
Vulcanizes compounded rubber sheet for rubber under specified temperature and pressure
After processing into a toothed belt slab, the toothed bell
Tooth slab is cut into a desired width in a sliced manner
Of toothed belts, characterized in that a belt with
Production method.