JPH0518517Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a high-load power transmission belt with blocks, which is constructed by installing blocks at fixed pitches at right angles along the longitudinal direction of the neutral belt. (Prior art) High-load power transmission belts that fit into the irregularities of a neutral belt to secure blocks have recently been widely used in various fields including the automobile industry.The basics of this high-load power transmission belt are Generally, as shown in FIG. 2, a tension member rope 3 is embedded in an elastic member 4, and upper and lower blocks 2 are arranged by fitting into the upper and lower recesses of a neutral belt 1, and bolts,
They are fastened and fixed using a fastening material 5 such as a rivet. By the way, in high-load power transmission belts in which such blocks are fixed, the conventional block material is mainly made of a material with greater rigidity than the elastic body constituting the neutral belt or the elastic body constituting the uneven portions, specifically, a material with a hardness of 85° or more. Hard rubber, hard polyurethane,
Phenol resin, epoxy resin, nylon resin,
Various resins such as polyester resin, acrylic resin, methacrylic resin, polyimide resin, or reinforced resins in which short fibers such as cotton yarn, chemical fibers, glass fibers, and metal fibers are mixed into these resins, or canvas impregnated with the above resins. They have been made by forming and curing a spiral or laminated canvas, or by forming and curing a canvas made of rubber with friction, coating, or starching. Among these, those using glass fiber as a resin reinforcing material fully satisfy the strength and physical properties (high flexural modulus, compression resistance, abrasion resistance) as a material that shares the lateral pressure of the belt, and the glass fiber is used as a blocking material. It has the effect of increasing the coefficient of friction, and when used in belts that perform friction transmission, it has the characteristic of being able to transmit large loads with low loads, and has been most frequently used. However, in the case of variable speed belts, it is necessary for the belt to move up and down smoothly on the pulleys and transmit the load while changing the rotation pitch line.
However, it is not enough just to have a block with a high friction coefficient. That is, if the coefficient of friction is too high, it will be difficult for the belt to move smoothly on the pulleys, and the belt will no longer function as a speed change belt, making it unusable. Therefore, in order to improve the shifting performance of the block, it has been considered to mix oil, MoS ₂ , graphite, etc. into the block material in order to lower the friction coefficient of the block, and several proposals have already been made. However, when I actually tried these products, I found that they were not as effective as expected, and even if they were effective, they were not sustainable for a long time due to oil volatilization, etc., so I was not fully satisfied. It didn't reach that point. (Problems to be solved by the invention) The present invention deals with the above-mentioned actual situation and aims to reduce the coefficient of friction and maintain the shifting performance of the block over a long period of time, and increase the strength of the block to withstand high load transmission. The object of the present invention is to achieve this effect by making a resin reinforcing material using one or a combination of carbon fibers, aramid fibers, and silicon carbide fibers as members. (Means for Solving the Problems) That is, the feature of the present invention, which will be made clear in the following description, is that the tensile rope is embedded in an elastic body and the outer surface is made uneven. In a high-load power transmission belt, blocks are disposed along the longitudinal direction of a neutral belt at fixed pitches at right angles and fit into the irregularities of the belt, and the blocks are fastened and fixed with fastening materials such as bolts and rivets. A fiber-reinforced thermosetting resin coated with a thermosetting resin on a woven fabric such as cloth, sudare cloth, or non-woven fabric made of at least one kind of thread selected from fibers, aramid fibers, or silicon carbide fibers. The main feature is that the block is formed by heating and pressure molding using a mold. Here, the fibers used as the resin reinforcing material are one or more selected from carbon fibers, aramid fibers, and silicon carbide fibers, and these can be used individually in the form of individual yarns, double yarns, or twisted yarns. It is woven or woven in combination of two or more types and used as a sudare cloth, cloth, or as a non-woven fabric, and is impregnated and coated with a thermosetting resin by a known method to form a block as a fiber-reinforced thermosetting resin material. used for. In particular, it is preferable to use canvas with high strength. The thermosetting resins used include phenol resins, epoxy resins, polyimide resins, etc. as in conventional block materials. There are various methods for making blocks, and any of them can be used, but in addition to the anchor type, the overlapping type, and the single type, the blocks are generally used. It can be created by placing a carbon fiber reinforced resin material on the outer periphery as a core, or by polymerizing an aramid fiber reinforced resin material and a carbon fiber reinforced resin material, wrapping them together, and molding them under heat and pressure using compression molding, etc. It is then made in the form of a block. (Function) Due to the type of fiber used, a high-load power transmission belt equipped with blocks as described above has a sufficiently lower coefficient of friction than a belt using conventional glass fiber fabric, and the strength of the blocks is increased. The amount of wear is significantly reduced, the wear and tear of the belt due to block breakage is prevented, and the durability of the belt can be increased. (Embodiments) Hereinafter, specific embodiments of the present invention will be described further based on the accompanying drawings. In FIGS. 1A to 1F, blocks 2 are arranged at right-angled pitches along the longitudinal direction of a neutral belt 1 in which a tensile rope 3 as shown in FIG. 2 is embedded in an elastic body 4, and bolts, Examples of blocks 2 used in high-load power transmission belts fastened and fixed with fastening materials 5 such as rivets are shown, and are an important feature of the present invention. Of course, the above block of the present invention can be applied to all blocks of belts with blocks, and it goes without saying that the belt itself is not limited to only high-load power transmission belts having the configuration as shown in the drawings. In FIG. 1, 2 represents a block, and in FIG. 1, 2a represents an aramid fiber reinforced resin material, and 2b represents a carbon fiber reinforced resin material. First, the structure shown in A is a bean-shaped block 2 structure in which an aramid fiber-reinforced resin material 2a is included as a core part, and the outer periphery is surrounded by a carbon fiber-reinforced resin material 2b. It has an anko-shaped block structure with the resin material on the outer periphery reversed. Each of these can be easily molded by wrapping another resin material around the outer periphery of the core, placing the whole in a mold, and heating and pressurizing it by compression molding. In this case, the usage allocation ratio of each resin material is selected as appropriate. Next, Figure C shows a layered aramid fiber reinforced resin material 2c and a carbon fiber reinforced resin material 2d, which are stacked one on top of the other, rolled up in a spiral shape, and molded by compression molding. The same thing can be done even if the paper is rolled up with the paper on the front side and the paper on the back. In addition, Figures 2 and 7 show individual block 2, in which the former is made of a carbon fiber reinforced resin material 2e, while the latter is made of an aramid fiber reinforced resin material 2f, which are roughly molded into a block shape, and then molded into a mold. It was then compressed and molded. Furthermore, the figure F shows a single type block as well, but the woven fabric used is a combination of aramid fiber and carbon fiber, and the two are used in combination to weave 2 g. Although the above uses carbon fiber and aramid fiber, silicon carbide fiber can also be used.
It is also effective to use either of the above-mentioned fibers or to increase the number of fibers used to form a mixture of the three types. Next, Table 1 shows the results of comparing the physical properties of the fibers used in the present invention and the conventional glass fibers.

[Table] From the results in the table above, it is understood that carbon fiber and aramid fiber themselves have the effect of lowering the friction coefficient of the block. However, when aramid fiber is used alone, there is a tendency for the physical properties to deteriorate slightly compared to comparative examples, so when using it under high loads, it is recommended to use carbon fiber alone or in combination with carbon fiber and aramid fiber. preferable. Table 2 below shows the durability test results of high-load power transmission belts using the blocks shown in each of the above examples during load running. The torque was 13Kg _-n and the gear shift width was 5.

[Table] From the above results, it can be seen that the device of the present invention can withstand practical use. Furthermore, in the block according to the present invention, it is also possible to use aluminum foil in combination, such as by wrapping the block in aluminum foil, thereby providing a heat dissipation effect at any time. (Effects of the invention) As described above, the present invention uses carbon fiber, aramid fiber, etc. alone or in combination as the block material of a high-load power transmission belt with blocks.
The suitability for use is increased compared to the conventional one using glass fiber, and it has the remarkable effect of lowering the friction coefficient of the block and improving the characteristics of the block when using a speed change belt. In this way, the suitability of the belt as a lateral pressure sharing member is increased, the durability against high load transmission is increased, and gradually,
It is expected to be effective as a power transmission belt with increasingly high loads.

[Brief explanation of the drawing]

FIGS. 1A to 1F are cross-sectional views showing examples of block configurations forming important parts of the high-load power transmission belt of the present invention, and FIG. 2 is a partial side cross-sectional view showing the basic structure of the high-load power transmission belt. 1...neutral belt, 2...block,
3... Tensile rope, 4... Elastic body, 5... Fastening material, 2a, 2c, 2f... Aramid fiber reinforced resin material, 2b, 2d, 2e... Carbon fiber reinforced resin material.

Claims (1)

[Scope of utility model registration request] A tensile rope is embedded in an elastic body, and blocks are placed along the longitudinal direction of the neutral belt, which has irregularities on its outer surface, by fitting into the irregularities at right-angled pitches, and are secured by fastening materials such as bolts and rivets. In a high-load power transmission belt that is fastened and fixed, the blocks are made of a cloth made of at least one kind of thread selected from carbon fibers, aramid fibers, or silicon carbide fibers, a woven fabric such as a cloth, a woven fabric, or a nonwoven fabric coated with a thermosetting resin. 1. A high-load power transmission belt characterized by having a block structure formed by winding layers of fiber-reinforced thermosetting resin material and molding them under heat and pressure using a mold.