Transmission belt

A technology for transmission belts and rubber layers, applied in the field of transmission belts, can solve the problems of reduced durability of toothed belts, less carbon black ratio, peeling, etc., and achieve the effects of inhibiting peeling, improving wear resistance and modulus, and improving durability.

Pending Publication Date: 2018-12-21

MITSUBOSHI BELTING LTD

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Problems solved by technology

Ethylene-α-olefin elastomer is non-polar because the main chain does not have unsaturated bonds, so it has excellent heat resistance and cold resistance, but on the other hand, it is very difficult to adhere to fibers

For example, rubber toothed belts based on EPDM have the following problems: the adhesive force between EPDM and the cover cloth or the core wire is insufficient, and the rubber or the cover cloth at the tooth root portion is thermally deteriorated especially during running at high temperatures , and repeated deformation, therefore, peeling occurs between the rubber and the core wire to form missing teeth, or peeling occurs at the interface between the cover cloth and the rubber, thereby greatly reducing the durability of the toothed belt

[0007...

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Method used

[0041] In the present invention, as a filler, carbon black is preferably contained in addition to silica. Carbon black has the effect of dramatically improving the fatigue resistance and wear resi...

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Abstract

The present invention relates to a transmission belt which is provided with: a rubber layer that is formed from a vulcanized product of a rubber composition which contains a rubber component containing an ethylene-alpha-olefin elastomer, a filler containing silica, a vulcanizing agent containing a sulfur-based vulcanizing agent, and a curable resin containing an amino resin; and a fiber member that is in contact with the rubber layer.

Application Domain

V-beltsDriving belts

Technology Topic

FiberTransmission belt +6

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Examples

Experimental program(2)

Example

[0115] Examples 1 to 10 and Comparative Examples 1 to 6

[0116] The rubber composition shown in Table 1 was used to prepare samples, and the results of evaluations of hardness and 50% tensile stress, core wire peeling force, canvas peeling force, and carry-over durability are shown in Table 1.

[0117]

[0118] From the results of Table 1, it can be judged that the transmission belts of Examples 1 to 10 have reached a traveling time of 300 hours or more, and have practically sufficient durability.

[0119] It should be noted that in Example 6, the mass ratio of the melamine resin to the silica was as low as 5% by mass, and the tooth loss failure occurred when the traveling time was 350 hours.

Example Embodiment

[0120] Example 7 is under the condition that the mass ratio of the melamine resin to the silica is as high as 60% by mass, and the tooth loss failure occurs after 300 hours.

[0121] In addition, in Example 8, under the conditions that the compounding amount of silica was as high as 50 parts by mass and the compounding amount of carbon black was as little as 20 parts by mass, the cover fabric peeling failure occurred after 300 hours.

[0122] In addition, Example 9 was a condition in which a resorcinol resin was added, and a tooth loss failure occurred at 300 hours. In contrast, in Example 2 where the resorcinol resin was not added, the belt ran for 400 hours without failure. Therefore, it can be judged that the addition of the resorcinol resin does not contribute to the improvement of durability.

[0123] In addition, Example 10 was a condition containing a guanamine resin as an amino resin, and compared with Comparative Example 1, an increase in hardness and tensile stress was observed. The core thread peeling force and canvas peeling force are also increased in the same way as the case of containing melamine resin, but the peeling force at 100°C tends to be slightly lower. That is, regarding the durability at high temperatures, the case of the melamine resin is slightly better than the guanamine resin.

[0124] Based on the above results, it can be judged that even after 400 hours of running, the belts of Examples 1 to 5 did not observe the failure of tooth missing or peeling of the cover cloth, and had particularly excellent durability.

[0125] On the other hand, in Comparative Examples 1 to 6, missing teeth occurred when running for less than 300 hours, and sufficient durability was not observed.

[0126] Specifically, in Comparative Examples 1 to 3, the melamine resin and/or silica were not added, and the tooth loss failure occurred during 200 to 250 hours of traveling.

[0127] Comparative Examples 4 and 6 are conditions under which organic peroxides are used for cross-linking, and a tooth loss failure occurs after running for 10 hours.

[0128] In addition, in Comparative Example 5, the melamine resin was not added but resorcinol resin was added, and the tooth loss failure occurred during 200 hours of traveling.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Inhibition of peeling

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Transmission belt

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Problems solved by technology

Method used

Abstract

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Example Embodiment

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Description & Claims & Application Information

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