Friction transmission belt

Abstract

The present invention relates to a friction transmission belt provided with an adhesive rubber layer which is in contact with at least a part of a core extending in the lengthwise direction of the belt, wherein the adhesive rubber layer is formed from a first vulcanized rubber composition containing a rubber component and a filler, the filler contains substantially no silica and contains at least30 parts of carbon black by mass per 100 parts of the rubber component by mass, and the core has an overcoat layer on the surface formed from a second vulcanized rubber composition that contains a rubber component and silica.

Description

technical field [0001] The present invention relates to friction transmission belts such as V-belts and V-ribbed belts whose friction transmission surfaces are inclined to form a V shape. Background technique [0002] Conventionally, friction transmission belts such as V-belts, ribbed belts, and flat belts are known as transmission belts for transmitting power. A V-belt or V-ribbed belt that forms a friction transmission surface (V-shaped side) at a V-shaped angle applies tension between the driving pulley and the driven pulley and hangs it, and the V-shaped side contacts the V-shaped groove of the pulley The state is rotating and walking between two axes. In this process, power is transmitted by utilizing the energy accompanying the friction generated by the thrust between the V-shaped side surface and the V-shaped groove of the pulley. In these friction transmission belts, a core is embedded in the rubber body (between the compression rubber layer and the extension rubbe...

AI Technical Summary

Problems solved by technology

[0008] However, from the viewpoint of formulation design of such a rubber composition, there is a concern that the following problems (1) to (4) may occur with belt running in a high-load environment, resulting in a reduction in durability (life)

[0009] (1) When the adhesiveness between the core wire and the adhesive rubber layer is low, peeling occurs between the core wire and the adhesive rubber layer

[0010] (2) When the friction coefficient of the contact surface (transmission surface) of the belt with the pulley is high, the belt cannot move smoothly, so the belt is easily deformed (especially buckling called dent)

[0018] However, even if this adhesive rubber layer is used, it is not enough to meet the further requirements of the high-load environment in recent years, and if the hardness is increased excessively by increasing the compounding amount of bismaleimide, the bending fatigue resistance will decrease.

[0019] That is, in the prior art, as in the belts of Patent Documents 1 to 4, although solutions to various problems have been proposed, it cannot be said that all of them can meet the requirements for withstanding severe operation in a high-load environment such as a transmission belt. characteristic

In detail, in the prior art, it has not been possible to maintain the adhesiveness of the adhesive rubber layer and the core wire while ensuring the mechanical properties (satisfying resistance to interfacial peeling (dispersion of shear stress), abrasion resistance, etc.) ), and a special product design that can also suppress the wear of the pulley

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