JP2004211755A - V-belt with cogs - Google Patents

Abstract

An upper rubber layer (12) is provided above a core wire (10) and a lower rubber layer (13) is provided below the core wire (10). Are provided side by side in the belt length direction, the cracks in the upper rubber layer 12 are prevented even when the belt B is wound around a small-diameter pulley. To extend the service life while ensuring the basic performance of
The elasticity of an upper rubber layer above a core wire is made smaller than that of a lower rubber layer. Also, on the upper rubber layer 12, at least one splay layer 20 formed by arranging and connecting a number of warps 22, 22, ... extending in the belt width direction in the belt length direction is formed. The lower rubber layer 13 having a high elastic modulus ensures the lateral pressure resistance of the belt B as a whole, while the lower rubber layer 12 having a reduced elasticity is easily bent to suppress the occurrence of cracks, and the bending rigidity of the belt B is reduced. The bending energy (calorific value) is also reduced to reduce the rate of thermal degradation (curing rate) of the rubber, thereby extending the life of the cogged V-belt B.
[Selection diagram] Fig. 1

Description

【００５３】
この表１の結果によると、実施例及び比較例１はいずれも３００時間を経過してもクラックが発生せず、本発明の効果が有効であることが判る。
【００５４】
【発明の効果】
以上説明した如く、請求項１の発明によると、心線下側の下ゴム層下面に多数のコグが設けられたコグ付きＶベルトにおいて、心線上側の上ゴム層に、ベルト幅方向に延びる多数のスダレ材をベルト長さ方向に並べて連結してなる少なくとも１層のスダレ層を設けたことにより、上ゴム層のスダレ層におけるスダレ材によりベルト全体の耐側圧性を確保しつつ、このスダレ層により上ゴム層を曲がり易くしてクラックの発生を抑制できるとともに、仮に上ゴム層にクラックが発生したとしても、そのクラックを最上層で止めて、ベルト長さ方向への進行を抑制し、コグ付きＶベルトの高寿命化を図ることができる。
【００５５】
請求項２の発明によると、上記請求項１のコグ付きＶベルトにおいて、上ゴム層の弾性率を下ゴム層よりも小さいものとしたことにより、弾性率の高い下ゴム層によりベルト全体の耐側圧性を確保しつつ、低弾性化された上ゴム層を曲がり易くしてクラックの発生を抑制し、ベルトの曲げ剛性の低減により屈曲エネルギー（発熱量）も小さくしてゴムの熱劣化速度（硬化速度）を遅くし、コグ付きＶベルトの高寿命化を達成でき、よって、コグ付きＶベルトのより一層の高寿命化及び耐側圧性の向上を図ることができる。
【００５６】
請求項３の発明によると、コグ付きＶベルトは、車両に搭載されるベルト式無段変速機の伝動ベルトに用いられるものとしたことにより、本発明の効果が有効に発揮されるのに最適なコグ付きＶベルトが得られる。
【図面の簡単な説明】
【図１】本発明の実施形態に係るコグ付きＶベルトの拡大斜視図である。
【図２】ベルト式無段変速機の概略正面図である。
【図３】ベルト式無段変速機の概略平面図である。
【図４】スダレ織物の概略斜視図である。
【図５】クラックの発生後の進行が抑制される状態を示す説明図である。
【図６】屈曲試験装置の概略図である。
【図７】屈曲試験の結果を示す図である。
【図８】耐側圧試験装置の概略図である。
【図９】耐側圧試験装置の要部拡大図である。
【図１０】耐側圧試験の結果を示す図である。
【図１１】クラック発生試験装置の概略図である。
【符号の説明】
Ｔ ベルト式無段変速機
Ｂ コグ付きＶベルト
１ 駆動プーリ
２ 従動プーリ
１０ 心線
１２ 上ゴム層
１３ 下ゴム層
１４ コグ
２０ スダレ層
２１ スダレ織物
２２ 経糸（スダレ材）[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cogged V-belt having a cog on the lower surface of the belt (cogged V-belt), and particularly to a technical field related to a measure for improving crack resistance of the belt.
[0002]
[Prior art]
Conventionally, this type of cogged V-belt is known as a type of V-belt. In this belt, a number of cogs extending in the belt width direction are provided side by side in the belt length direction on a lower surface of a rubber layer in which a core wire is embedded in an upper and lower middle portion, and a side surface in a belt width direction contacts a belt groove side surface of a pulley. The upper fabric layer is integrated on the upper surface of the belt, and the lower fabric layer is integrated on the lower surface (cog surface). The belt is generally used as a part of a belt-type continuously variable transmission in vehicles such as a motorcycle, a buggy, and a snowmobile (for example, see Patent Documents 1 to 3).
[0003]
[Patent Document 1]
JP-A-8-93858 [Patent Document 2]
Japanese Patent Application Laid-Open No. 9-303488 [Patent Document 3]
Japanese Patent Application Laid-Open No. Hei 10-238596
[Problems to be solved by the invention]
By the way, when such a cogged V-belt is wound around a small-diameter pulley, for example, one of the pulley diameters of a driving or driven pulley is minimized according to a shift state in a continuously variable transmission or the like, and the belt is pulled around the pulley. When the belt is wound around the pulley, the bending rate of the belt changes to an extremely large value. In addition, since the rubber layer of the belt becomes fatigued with the running of the belt for a long period of time, cracks extending in the width direction of the belt are generated in the upper rubber layer above the core wire in the rubber layer of the belt.
[0005]
More specifically, when the belt is running, when the upper rubber layer portion of the belt before entering the small-diameter pulley has a length A, when the belt is wound around the pulley, the upper rubber layer portion is stretched. Therefore, cracks occur due to an increase in the elongation of the upper rubber layer. When this crack occurs, it extends in the belt width direction, but then progresses in the belt length direction, causing a problem that the belt eventually falls into a state in which shifting cannot be performed and a state in which transmission cannot be performed.
[0006]
In order to solve such a problem, it is conceivable to omit the upper rubber layer in the cogged V-belt. However, in the case of the V-belt, when the V-belt is deformed by receiving a side pressure from the side of the belt groove of the pulley, the members are separated. The upper rubber layer is indispensable for securing the lateral pressure resistance, and it cannot be a practical solution.
[0007]
An object of the present invention is to improve the structure of the rubber layer of the cogged V-belt to prevent the upper rubber layer from being cracked when the belt is wound around a small-diameter pulley, and to improve the cogged V-belt. The purpose is to extend the service life of the belt while ensuring the basic performance of the belt.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, the upper rubber layer is formed with a splay layer in the upper and lower rubber layers bordering on the cord.
[0009]
Specifically, in the invention of claim 1, an upper rubber layer is provided on the upper side of the core wire, and a lower rubber layer is provided on the lower side, and a plurality of rubber layers extend in the belt width direction on the lower surface of the lower rubber layer. In the cogged V-belt provided with cogs arranged side by side in the belt length direction, the upper rubber layer has at least one layer formed by arranging and connecting a large number of slender materials extending in the belt width direction in the belt length direction. It is characterized in that a sumare layer is provided.
[0010]
According to this configuration, the sledding layer provided on the upper rubber layer is formed by connecting a large number of sledding materials extending in the belt width direction in the belt length direction and connecting them. Due to the connection between the upper rubber layers, the upper rubber layer is easily bent, and cracks are less likely to occur even when the belt is wound around the small-diameter pulley.
[0011]
Also, since the upper rubber layer has a multi-layered laminated structure including a sump layer, even if a crack occurs in the upper rubber layer of the belt from the upper surface of the belt, the crack stays at the uppermost layer, and from there It is difficult to progress in the belt length direction, and the progress after the occurrence of cracks can be suppressed. Thus, the life of the cogged V-belt can be extended.
[0012]
In addition, since the slender material in the slender layer of the upper rubber layer extends in the belt width direction, a high level of lateral pressure resistance of the entire belt can be secured by the slender material.
[0013]
According to a second aspect of the present invention, in the cogged V-belt of the first aspect, the elastic modulus of the upper rubber layer is smaller than that of the lower rubber layer.
[0014]
In this case, since the upper rubber layer has a lower elasticity than the lower rubber layer, the upper rubber layer is easily bent, and cracks are less likely to occur even when the belt is wound around the small-diameter pulley. Moreover, the lower elasticity of the upper rubber layer reduces the flexural rigidity of the belt, reduces the energy (calorific value) generated at the time of flexing, and can slow down the rate of thermal degradation (curing rate) of the rubber. A longer life can be achieved.
[0015]
Further, since the lower rubber layer of the belt has a high elastic modulus, a higher level of lateral pressure resistance of the entire belt can be secured by the higher elastic lower rubber layer.
[0016]
Therefore, the operation and effect of the first aspect of the invention can be obtained in synergy, and the life of the cogged V-belt can be further increased and the lateral pressure resistance can be improved.
[0017]
According to the third aspect of the present invention, the cogged V-belt is used for a transmission belt of a belt-type continuously variable transmission mounted on a vehicle. By doing so, a cogged V-belt that is optimal for effectively exhibiting the effects of the present invention can be obtained.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows a cogged V-belt B according to an embodiment of the present invention, and this belt B is used as a transmission belt (speed-change belt) in a belt-type continuously variable transmission T, for example, as shown in FIGS. .
[0019]
The belt-type continuously variable transmission T is mounted on a vehicle such as a motorcycle, a buggy, a snowmobile, and the like, and includes a drive pulley 1 that is drivingly connected to an output shaft of an engine (not shown), And a driven pulley 2 which is drivingly connected to a wheel (not shown). Each of the pulleys 1 and 2 is constituted by a variable speed V pulley. A fixed sheave 5 is fixed to the respective rotating shafts 3 and 4 so as to be integrally rotatable and immovable in the axial direction, and a fixed sheave 5 is fixed to the rotating shafts 3 and 4. And a movable sheave 6 which is opposed to the belt so as to form a belt groove 7 having a V-shaped cross-section, and which is supported so as to be integrally rotatable and slidable in the axial direction. The cogged V-belt B is wound between the belt grooves 7, 7 of the pulleys 1, 2, and the movable sheave 6 of the driving and driven pulleys 1, 2 is moved toward and away from the fixed sheave 5 so that each pulley The drive pulley 1 is opened by changing the speed ratio between the drive sheaves 1 and 2 to separate the movable sheave 6 of the drive pulley 1 from the fixed sheave 5, and the movable sheave 6 of the driven pulley 2 is moved closer to the fixed sheave 5 so as to be driven When the driving pulley 2 is closed, the pulley diameter of the driving pulley 1 is made smaller than that of the driven pulley 2 to reduce the rotation speed of the driving pulley 1 to a low speed state in which the driving pulley 1 is transmitted to the driven pulley 2, while the movable sheave 6 of the driving pulley 1 is moved. When the movable sheave 6 of the driven pulley 2 is separated from the fixed sheave 5 and the driven pulley 2 is opened, the pulley diameter of the driven pulley 1 Larger than the pulley 2, so that a high-speed state of transmitting to the driven pulley 2 and accelerated to the rotational speed of the drive pulley 1.
[0020]
The cogged V-belt B has a V-shaped cross section, and the left and right side surfaces in the belt width direction abut on both side surfaces of the belt groove 7 of the pulleys 1 and 2. At an intermediate portion (above the center portion) in the thickness direction of the belt B, a core wire 10 is spirally wound so as to advance in the belt length direction and toward the belt width direction. They are integrally joined by an adhesive rubber layer 11 having substantially the same thickness as the diameter.
[0021]
With the adhesive rubber layer 11 (core wire 10) as a boundary, an upper rubber layer 12 is bonded on the upper side and a lower rubber layer 13 is bonded on the lower side integrally by vulcanization. On the lower surface of the lower rubber layer 13, a large number of cogs 14, 14,... Extending in the belt width direction are provided side by side in the belt length direction.
[0022]
An upper canvas layer 15 is provided on the upper surface of the upper rubber layer 12 (the outer peripheral surface of the belt B), and a lower surface of the lower rubber layer 13 (the inner peripheral surface of the belt B) is provided along the surfaces of the cogs 14, 14,. The lower canvas layers 16 are respectively bonded and integrated by vulcanization.
[0023]
As a feature of the present invention, the elastic modulus of the upper rubber layer 12 is lower than the elastic modulus of the lower rubber layer 13. For example, the elastic modulus can be represented by hardness, the range of the rubber hardness of the upper rubber layer 12 is in the range of 75 ° to 85 °, and the range of the rubber hardness of the lower rubber layer 13 is in the range of 80 ° to 90 °. The numerical ranges of the rubber hardness are determined independently of the hardness ranges of the rubber layers 12 and 13, and satisfy the condition that the elastic modulus of the upper rubber layer 12 is lower than the elastic modulus of the lower rubber layer 13. When the hardness of the upper rubber layer 12 is determined to be a certain set hardness (for example, 81 °), the hardness of the lower rubber layer 13 is higher than the set hardness of the upper rubber layer 12 (for example, 90 °). ).
[0024]
The method of lowering the elastic modulus of the upper rubber layer 12 can be performed, for example, by reducing the amount of reinforcing carbon of the compounding agent.
[0025]
The upper rubber layer 12 is provided with at least one splay layer 20. The drip layer 20 is made of, for example, a drip cloth 21 as shown in FIG. 4, and has a length substantially equal to the belt width of the upper rubber layer 12 and a number of substantially bar-shaped warp yarns 22, extending in the belt width direction. Are connected in a line in the belt length direction.
[0026]
The above-mentioned Sudare textile 21 is manufactured as follows, for example. That is, in the above-mentioned woven fabric 21, warps 22, 22,... Serving as a large number of woven materials are arranged in a predetermined width, and in this state, wefts 23, 23,. It is formed by connecting with. Each of the warp yarns 22 is composed of a multifilament yarn made of synthetic fibers such as aromatic nylon, aliphatic nylon, polyester, and vinylon, and inorganic fibers such as carbon fiber. The multifilament yarn has a length of, for example, 840 de (denier). Make the structure easy to twist processing like double twisted yarn.
[0027]
The warp yarn 22 is formed by twisting a multifilament yarn in a single twist state. The number of twists of the sweet twist is 4 to 9 times / 10 cm. When the number of twists of the sweet twist is less than 4/10 cm, troubles are likely to occur at the time of weaving. On the other hand, if the number of twists of the sweet twist exceeds 9/10 cm, the weaving property is improved, but the adhesive adheres only to the surface of the warp yarn 22 during the bonding treatment, and it is difficult to impregnate the inside.
[0028]
The weft yarn 23 may have a minimum density (number of strikes) at which the weaving process and the bonding process can be performed, and it is preferable to strike the weft yarn 23 at a density of 1/5 cm or more. If the density of the weft yarns 23 is less than 1 yarn / 5 cm, weaving of swarf is difficult, and in addition, cracks occur at the time of bonding treatment, and troubles occur frequently.
[0029]
Next, the soda woven fabric 21 configured as described above is subjected to an adhesive treatment. This bonding treatment is a so-called dip treatment performed by immersing the woven fabric 21 in a mixed solution (RFL solution) of a resorcinol-formalin precondensate and rubber latex.
[0030]
The mixing of the RFL solution is usually carried out under a basic catalyst in a charged molar ratio of resorcinol and formalin in the range of 1.0 / 1.0 to 3.0, and this reactant, resorcinol-formalin precondensate, Both are mixed so that the weight ratio with the rubber latex is 10 to 30/100.
[0031]
Examples of the rubber latex include those similar to ordinary rubber to be adhered. For example, for natural rubber and styrene / butadiene copolymer rubber, vinylpyridine / styrene / butadiene terpolymer rubber latex and styrene / butadiene copolymer rubber are used. Combined rubber latex and natural rubber latex are used. For chloroprene rubber, chloroprene rubber latex may be used in addition to the above. In addition, it is not limited to the latex shown in these.
[0032]
Further, the warp yarn 22 is heat-treated so that the dry heat shrinkage is 1% or more. If the warp yarn 22 has a dry heat shrinkage ratio of less than 1%, it is necessary to considerably reduce the tension at the time of the bonding treatment, and a trouble is likely to occur.
[0033]
Thereafter, when a cylindrical belt molded body (not shown) is molded in the same manner as in the production of a normal cogged V-belt, the above-mentioned adhesive treated sewage woven fabric 21 is warped on the upper rubber layer 12. , 22 (... (Suddle material) are embedded and formed so as to be arranged in the belt length direction, and this belt formed body is cut into a belt width to obtain a cogged V-belt B.
[0034]
Therefore, in the case of this embodiment, the splay layer 20 formed on the upper rubber layer 12 of the cogged V-belt B includes a large number of warps 22, 22,... The upper rubber layer 12 is easily bent due to the connection between the warp yarns 22, 22,... (Sudare material) of the sudare layer 20 because the belt B is wound around a small-diameter pulley. Cracks are less likely to occur even in the cracked state.
[0035]
Further, since the upper rubber layer 12 has a multi-layered laminated structure including the splay layer 20, even if cracks C occur from the upper surface of the belt B in the upper rubber layer 12 of the belt B as shown in FIG. The crack C temporarily stays in the uppermost layer, and it is difficult for the crack C to proceed in the belt length direction, so that the progress after the occurrence of the crack C can be suppressed. Thus, the life of the cogged V-belt B can be extended.
[0036]
Further, since the warp yarns 22, 22,... (Suddle material) in the slender layer 20 of the upper rubber layer 12 extend in the belt width direction, the warp yarns 22, 22,. Standards can be secured.
[0037]
Furthermore, since the upper rubber layer 12 of the cogged V-belt B has a lower elasticity than the lower rubber layer 13, the upper rubber layer 12 is easily bent. For this reason, for example, when the belt B is wound around the driving pulley 1 having a smaller pulley diameter in the low-speed state of the transmission T or the driven pulley 2 having a smaller pulley diameter in a high-speed state, the belt B Even if the wire is wound around a small-diameter pulley and the bending rate is increased, cracks are less likely to occur in the rubber layer 12.
[0038]
In addition, since the bending rigidity of the belt B is reduced by lowering the elasticity of the upper rubber layer 12, the energy generated when the belt B is bent, that is, the calorific value is also reduced, and the thermal deterioration rate of the rubber layer 12 is correspondingly reduced. (Curing speed) decreases. As described above, the life of the cogged V-belt B can be extended.
[0039]
Furthermore, since the elastic modulus of only the upper rubber layer 12 of the belt B is low and the elastic modulus of the lower rubber layer 13 remains high, the high elastic lower rubber layer 13 can improve the lateral pressure resistance of the entire belt B to a high level. Can be secured. Therefore, it is possible to secure the lateral pressure resistance of the entire belt B and to extend the service life of the cogged V-belt B while securing the basic performance thereof.
[0040]
(Other embodiments)
In the above embodiment, the rubber layer of the belt B is divided into the adhesive rubber layer 11 and the upper and lower rubber layers 12, 13, and the elastic modulus of the upper and lower rubber layers 12, 13 is made different. The upper part is included in the upper rubber layer 12, and the lower part is included in the lower rubber layer 13, and the elastic modulus of the upper rubber layer 12 including the upper part of the adhesive rubber layer 11 is determined by the adhesive rubber layer. 11 may be smaller than the elastic modulus of the lower rubber layer 13 including the lower portion.
[0041]
In addition, in the embodiment, the surging layer 20 is formed of the surging fabric 21, but may be formed of a material other than the surging fabric 21.
[0042]
Further, in the above embodiment, the cogged V-belt B is used for the transmission belt of the belt-type continuously variable transmission T mounted on the vehicle. However, the present invention is not limited to this, and the present invention is not limited thereto. It goes without saying that the present invention can also be applied to a cogged V-belt used as a power transmission belt in a power transmission device.
[0043]
【Example】
Next, a specific embodiment will be described.
[0044]
(Example)
A cogged V-belt B (see FIG. 1) having the configuration of the above-described embodiment having the splay layer 20 on the upper rubber layer 12 was used as an example. The rubber hardness of the upper rubber layer 12 was 80 °, and the rubber hardness of the lower rubber layer 13 was 85 °. The length of the belt B was 750 mm, the width was 20 mm, and the thickness was 9 mm.
[0045]
(Comparative Example 1)
Further, Comparative Example 1 was obtained by omitting the splay layer 20 from the above example. The size of the belt B is the same as that of the embodiment.
[0046]
(Comparative Example 2)
Further, Comparative Example 2 (conventional example) was obtained by omitting the splay layer 20 from the above-described example and making the upper rubber layer 12 and the lower rubber layer 13 have the same rubber hardness of 85 °. The size of the belt B is the same as that of the embodiment.
[0047]
(Bending test)
As shown in FIG. 6, the belts B of Comparative Example 1 and Comparative Example 2 are placed on the base 30 so that the belt thickness direction is along a vertical plane, and the pressing plate 31 is placed on the belt B. The belt B is flattened in an elliptical shape by pressing downward on the base 30 with a constant load F (4.9 N), and the height h1 of the upper surface of the base 30 and the lower surface of the pressing plate 31 at that time is measured. did. That is, the smaller the height h1, the more easily the belt B is bent to a small diameter. FIG. 7 shows the result.
[0048]
According to FIG. 7, the height h1 of Comparative Example 1 is 120 mm, which is 30 mm smaller than that of Comparative Example 2, and it can be seen that if the hardness of the upper rubber layer of the cogged belt is smaller than that of the lower rubber layer, it is easy to bend. .
[0049]
(Side pressure resistance test)
Next, a lateral pressure resistance test was performed for the above-described example and comparative example 2. As shown in FIG. 8, the test apparatus for performing this test includes a pair of upper and lower pulleys 33 and 34 each having a constant speed V pulley having the same diameter. 33 is suspended and fixed, a downward load DW of a constant load (294N) is applied to the lower pulley 34 to apply belt tension, and the side of the belt B wound around the upper pulley 33 is When pressed from the side surface in the belt groove 33a and bent in the width direction, the deformation amount h2, which is the difference in height between the left and right end portions in the width direction of the upper surface of the belt B and the central portion, was measured. That is, the smaller the deformation amount h2, the higher the lateral pressure resistance of the belt B. The result is shown in FIG.
[0050]
According to FIG. 10, the deformation amount h2 of the example is 0.3 mm, which is smaller than that of the comparative example 2 by 0.2 mm, and it can be seen that the lateral pressure resistance of the cogged belt B of the present invention is higher than that of the conventional example. .
[0051]
(Crack generation test)
Further, a durability test was conducted on the above Examples and Comparative Examples 1 and 2 until a crack occurred in the belt B. As shown in FIG. 11, this test apparatus includes a comparative example 1, a comparative example 1, and a driven pulley 37 composed of a constant-speed V pulley having a diameter of 120 mm and a driven pulley 37 composed of a constant-speed V pulley having a diameter of 120 mm. Each cogged V-belt B of Example 2 was wound around, and a load of 18.2 PS was applied to the driven pulley 37 to rotate the driving pulley 36 at 7550 rpm, and the time until cracking of the belt B was examined. The ambient temperature was 90 ° C. Table 1 shows the results.
[0052]
[Table 1]

[0053]
According to the results shown in Table 1, no cracks occurred in Example and Comparative Example 1 even after elapse of 300 hours, indicating that the effects of the present invention are effective.
[0054]
【The invention's effect】
As described above, according to the first aspect of the present invention, in a cogged V-belt in which a large number of cogs are provided on the lower surface of the lower rubber layer below the core wire, the belt extends in the belt width direction to the upper rubber layer above the core wire. By providing at least one sledding layer formed by arranging and connecting a large number of slewing materials in the belt length direction, it is possible to secure the lateral pressure resistance of the entire belt by using the slewing material in the upper rubber layer. The upper rubber layer can be easily bent by the layer and the occurrence of cracks can be suppressed, and even if a crack occurs in the upper rubber layer, the crack is stopped at the uppermost layer, and the progress in the belt length direction is suppressed, The life of the cogged V-belt can be extended.
[0055]
According to the second aspect of the present invention, in the cogged V-belt according to the first aspect, the elastic modulus of the upper rubber layer is smaller than that of the lower rubber layer. While ensuring the lateral pressure, the upper rubber layer with reduced elasticity is easily bent to suppress the occurrence of cracks, and by reducing the bending stiffness of the belt, the bending energy (heat generation) is also reduced to reduce the rubber thermal degradation rate ( The curing speed) can be reduced, and the life of the cogged V-belt can be prolonged. Therefore, the life of the cogged V-belt can be further prolonged and the lateral pressure resistance can be improved.
[0056]
According to the third aspect of the present invention, the cogged V-belt is used for a transmission belt of a belt-type continuously variable transmission mounted on a vehicle, so that the effect of the present invention is optimally exhibited. A cogged V-belt is obtained.
[Brief description of the drawings]
FIG. 1 is an enlarged perspective view of a cogged V-belt according to an embodiment of the present invention.
FIG. 2 is a schematic front view of a belt-type continuously variable transmission.
FIG. 3 is a schematic plan view of a belt-type continuously variable transmission.
FIG. 4 is a schematic perspective view of a Sudare fabric.
FIG. 5 is an explanatory diagram showing a state in which the progress after the occurrence of a crack is suppressed.
FIG. 6 is a schematic view of a bending test apparatus.
FIG. 7 is a diagram showing a result of a bending test.
FIG. 8 is a schematic diagram of an anti-lateral pressure test apparatus.
FIG. 9 is an enlarged view of a main part of the lateral pressure resistance test device.
FIG. 10 is a diagram showing the results of a lateral pressure resistance test.
FIG. 11 is a schematic diagram of a crack generation test device.
[Explanation of symbols]
T-belt type continuously variable transmission B V-belt with cog 1 Drive pulley 2 Driven pulley 10 Core wire 12 Upper rubber layer 13 Lower rubber layer 14 Cog 20 Suddle layer 21 Saddle fabric 22 Warp (suddle material)

Claims (3)

An upper rubber layer is provided on the upper side of the core wire, and a lower rubber layer is provided on the lower side,
A cogged V-belt in which a large number of cogs extending in the belt width direction are provided on the lower surface of the lower rubber layer in a line in the belt length direction,
A cogged V-belt, characterized in that the upper rubber layer is provided with at least one layer of a slender layer formed by connecting a number of slender members extending in a belt width direction in a belt length direction and connecting them. The cogged V-belt of claim 1,
A cogged V-belt, wherein the elastic modulus of the upper rubber layer is smaller than that of the lower rubber layer. The cogged V-belt according to claim 1 or 2,
A cogged V-belt used for a transmission belt of a belt-type continuously variable transmission mounted on a vehicle.

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