JPH0516432Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a high-load power transmission belt in which blocks are attached to a neutral belt with unevenness, and in particular suppresses heat generation in the belt and improves the transmission force and durability of the belt. This invention relates to the improved belt.

(Prior art) A high-load power transmission belt, in which blocks are fastened vertically at fixed pitches at right angles along the longitudinal direction of the neutral belt using bolts, etc., can respond to changes in the desired speed ratio of a variable-speed belt drive device. Since it is possible to have a structure with a small ratio of thickness to width, it has recently been widely used as a starting material for automobiles, and many inventions and ideas are being developed.

However, one problem with the high-load power transmission belt having the above-described structure is that of heat generation.

That is, during high-load transmission, the belt gradually generates heat due to bending, friction between the blocks and the neutral belt, and strain deformation.

If this heat generation continues, it will cause various problems such as deterioration of the rubber, deterioration of the adhesion between the rope and rubber, wear and tear of the canvas and rubber, and a decrease in the rigidity of the blocks, resulting in a decrease in the transmission force and durability of the entire belt. I cannot escape the invitation.

By the way, in the past, various measures have been taken against such heat generation, but most of them are indirect measures such as loosening of bolts due to heat generation.
No attempt has been made to suppress the fever itself.

(Problems to be solved by the invention) The present invention deals with the above-mentioned actual situation, and dissipates the heat generated in the belt into the atmosphere by distributing powder with good thermal conductivity to the blocks, thereby reducing heat generation or heat accumulation in the belt. The aim is to suppress this.

(Means for Solving the Problem) That is, the feature of the present invention is that in a high-load power transmission belt in which blocks are fastened and fixed in the upper and lower portions at right angle fixed pitches along the longitudinal direction of the neutral belt, The main feature is that a powder material with good thermal conductivity, such as aluminum powder, is dispersed and mixed into at least one of the blocks.

Here, the shape of the block is not particularly limited, and various conventionally known shapes can be used, but
It is advantageous in terms of heat dissipation that at least the block mixed with the powder material is provided with a convex portion on the upper surface and/or lower surface in the case of an upper block, and on the lower surface and/or upper surface in the case of a lower block. It is.

The powder having good thermal conductivity may be mixed in only one of the upper and lower blocks, but it is more effective to mix it in both blocks.

Powders with good thermal conductivity used include metal powders such as aluminum powder, copper powder, iron powder, and brass powder.

(Function) Thus, in the high-load power transmission belt configured as described above, even if heat is generated in the belt, due to the presence of the powder with good thermal conductivity, the powder is dissipated through the heat, and Since it is in contact with the pulley, it is also dissipated into the atmosphere through the pulley, completely suppressing the heat generation of the belt. In particular, if the pulley has fins or the like, the dissipation effect is great.

Further, deterioration of physical properties due to heat of the block is also avoided.

(Embodiments) Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.

FIG. 1 shows a preferred embodiment of the high-load power transmission belt of the present invention, and in the figure, a indicates the high-load power transmission belt;
1 is a neutral belt with unevenness on the top and bottom,
Reference numerals 2 and 3 indicate upper and lower blocks disposed vertically at regular pitches along the longitudinal direction of the neutral belt 1, and the neutral belt 1 is covered with a spiral tensile rope 4. Elastic body 5
are arranged in layers, and canvas is applied to the top or upper and lower surfaces as necessary, although not shown.

Here, the tensile rope 4 buried in parallel in a spiral shape is made of a low elongation and high strength rope tensile material selected from polyester, aliphatic polyamide, aromatic polyamide, glass fiber, wire, etc. The elastic body 5 covering this is NR
(Natural rubber, SBR (styrene-butadiene rubber),
CR (chloroprene rubber), NBR (nitrile rubber),
It is made of a single material such as IIR (butyl rubber), Hypalon (chlorosulfonated polyethylene) EPT, EPR, epichlorohydrin, or an appropriate blend of these rubbers or polyurethanes.

On the other hand, the blocks 2 and 3 are preferably made of a material with greater rigidity than the elastic body 5 constituting the neutravel belt 1 or the elastic body constituting the uneven portions, specifically, hard rubber with a hardness of 85 or more, hard polyurethane, Reinforced resins such as phenolic resin, epoxy resin, nylon resin, polyester resin, acrylic resin, methacrylic resin, polyimide resin, etc., or reinforced resins in which short fibers such as cotton thread, chemical fiber, glass fiber, and metal fiber are mixed with these resins. Canvases impregnated with the above resins are molded and cured in a spiral or layered manner, and rubber is frixioned, coated,
It is made of starched canvas that is spirally shaped or layered and then molded and hardened.

The blocks 2 and 3 are usually disposed on at least one of the upper and lower surfaces of the belt 1, and in the case of the illustrated embodiment, on both upper and lower surfaces, and are used to stop bolts, rivets, etc. that pass through the neutral belt 1. The belt is fastened and fixed by the binding material 6 at a predetermined pitch in the perpendicular direction along the longitudinal direction of the belt.

In addition, in the above configuration, the upper and lower blocks 2,
3, the lower block 3 usually has an inverted trapezoidal side, while the upper block 2 has an oblong rectangular side, and the contact surface with the belt 1 has a concave-convex fitting shape that fits into each other. In Fig. 1, with the concave portion of the neutral belt 1 and the convex portions of the upper and lower blocks 2 and 3 fitted together, the belt length is fixed by a fastening member 6 such as a bolt passing through the belt 1 and the upper and lower blocks 2 and 3. Although it is fastened and fixed at the required pitch in the direction, it is also possible to do the opposite, that is, to make the block side a concave part and the belt side a convex part.
Moreover, other concave-convex fitting shapes may also be used.

Moreover, in FIG. 1, both the upper and lower blocks 2 and 3 are further provided with a convex portion on the upper surface of the upper block 2. As shown in FIG.

This is because it is advantageous in increasing the contact area with the atmosphere and also in promoting heat dissipation by providing an effect as a fin.

However, in the block configuration as described above,
Reference numeral 7 denotes a powder having good thermal conductivity, which is an important part of the present invention, and is dispersed and mixed on average in both the upper and lower blocks 2 and 3 in FIG.

Of course, as mentioned above, this is effective to some extent not only for both the upper and lower blocks but only for either one of the blocks.

Thus, the above-mentioned high-load transmission belt is used as a power transmission belt wrapped around a pulley, but even if heat is generated during high-load transmission, heat is dissipated through the pulley due to the inclusion of powder with good thermal conductivity. , heat generation does not accumulate, and various harmful effects caused by heat generation can be prevented.
Smooth power transmission is guaranteed.

(Effects of the invention) The present invention is based on the above-described high-load power transmission belt, which has upper and lower blocks arranged along the longitudinal direction of the neutral belt. Powder is mixed in, and the heat generated in the belt can be dissipated through the powder into the atmosphere via the pulleys, and heat generation due to belt bending, friction between the block and the belt, or distortion during high-load transmission can be avoided. Even if heat is generated, the heat is dissipated and is not stored in the belt. Therefore, belt heat generation not only causes deterioration of the rubber, decreases physical properties such as block rigidity and abrasion resistance, but also promotes loosening of the fastening material. This has the effect of ensuring the transmission force of the belt and improving its durability.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view in the belt longitudinal direction showing an embodiment of the high-load power transmission belt of the present invention. a... High load transmission belt, 1... New travel belt, 2, 3... Upper and lower blocks, 4... Tensile rope, 5... Elastic body, 6... Fastening material, 7... Thermal conductivity good powder.

Claims (1)

[Claims for Utility Model Registration] 1. A high-load power transmission made by fitting blocks vertically along the longitudinal direction of a neutral belt with unevenness at required pitches at right angles and fastening them with fastening materials such as bolts and rivets. A high-load power transmission belt characterized in that a powder material having good thermal conductivity is dispersed and mixed into the upper and lower blocks of the belt. 2 Utility model registration claim No. 1, which is a block in which a powder material with good thermal conductivity is dispersed and has a convex portion on the upper surface and/or lower surface.
High-load power transmission belt as described in section. 3 Powder materials with good thermal conductivity include aluminum, copper, iron,
Magnesium, tin, zinc, tungsten, nickel, molybdenum, gold, silver, silicon, zirconium, bismuth or their alloys alone or in combination
The high-load power transmission belt according to claim 1 or 2 of the utility model registration claim, which is a mixture of two or more types.