JPH0232913Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a high-load power transmission belt in which a block is attached to a neutral belt having unevenness. This invention relates to the above-mentioned belt with improved transmission power and durability.

(Prior art) A high-load power transmission belt, in which upper and lower blocks are tightened with bolts or the like at fixed pitches at right angles along the longitudinal direction of the neutral belt, can respond to changes in the desired speed ratio of a variable-speed belt drive device. Since it is possible to create a structure with a small ratio of thickness to width, it has recently been widely used in automobiles and other applications.
Many inventions and ideas are being developed.

However, one problem with the high-load power transmission belt constructed as described above 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 that heat 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 can't help but be invited.

Therefore, various countermeasures have been taken in the past to deal with such heat generation, but most of them have been indirect, such as loosening of bolts, and no attempt has been made to suppress the heat generation itself. .

Therefore, in order to overcome the above-mentioned situation, the inventors of the present invention dissipated the heat generated in the belt into the atmosphere by placing a thin layer with good thermal conductivity on the surface of the block that comes into contact with the neutral belt. In order to suppress the heat generation or heat accumulation of
As shown in the figure, in a high-load power transmission belt in which blocks 2 and 3 are fastened and fixed vertically at fixed pitches along the longitudinal direction of the neutral belt 1, the surfaces of the blocks 2 and 3 that come into contact with the belt are made of aluminum. It was proposed to form a thin layer A with good thermal conductivity, such as the above, or to disperse and mix a powder material with good thermal conductivity into the upper and lower blocks. (Utility Application No. 61-48854, No. 48855) (Problems to be solved by the invention) However, the above proposal usually consists of a thin metal layer with good thermal conductivity covering the entire width of the belt. If the metal that covers the outer periphery and is exposed on the end face of the block comes into contact with the pulley, friction between the metal and the pulley will cause seizure and wear, so the problem is that the metal layer cannot be made very thick. There was a limit to the heat dissipation effect.

In view of the above-mentioned circumstances, the present invention aims to make it easier to increase the thickness of the metal layer, thereby significantly improving the heat dissipation effect.

(Means for Solving the Problems) That is, the feature of the present invention is that blocks are formed vertically at a fixed pitch at right angles along the longitudinal direction of a neutral belt having convex or concave portions that fit with the blocks as described above. In high-load power transmission belts that are fitted together and fastened with bolts, rivets, or other fastening materials, the blocks are cut so that the central part of the belt width that does not contact the pulleys is compared to the both ends that contact the pulleys. The structure should have a small area, and at least the side of the small cross-sectional area that contacts the belt should be made of a thin metal plate (foil) with good thermal conductivity, a metal woven fabric such as sudare weave, or a spirally wrapped part. It consists of layers of thermally conductive materials such as thin metal wires.

Here, the metal of the thermally conductive material is aluminum,
Examples include copper, zinc, silicon, nickel, magnesium, and alloys thereof.

The layer of thermally conductive material having good thermal conductivity may be applied only to at least the portion of the block that contacts the belt, but it is more preferable to cover the periphery of the block.

The thermally conductive material may be applied to both the upper and lower blocks, or only one, and preferably both blocks.

Furthermore, the thermally conductive material does not necessarily have to be adhered by adhesion, and may simply be in contact with the pressure generated when tightened with bolts or the like. Further, the thickness of the thermally conductive material is determined depending on the cross-sectional area of the central portion of the block, and it is an advantageous aspect of the present invention that it can be made as thick as possible.

(Function) Thus, even if heat is generated in the high-load transmission belt configured as described above, it is dissipated into the atmosphere through the thin layer with good thermal conductivity.

Moreover, since the heat conductive material layer is covered with the small cross-sectional area at the center of the block, it can be made quite thick and the heat dissipation effect is good.

Furthermore, since the side surface of the block is in contact with the pulley, heat is dissipated into the atmosphere through the pulley, and heat generation from the belt is completely suppressed.

(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, in which a indicates the high-load power transmission belt;
1 is a neutral belt with unevenness on the top and bottom, 2
Reference numeral 3 indicates 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 to provide elasticity. body 5
Although not shown in the drawings, the top or upper and lower surfaces of the canvas are covered with canvas, if necessary.

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 consists of a single material such as IIR (butyl rubber), Hypalon (chlorosulfonated polyethylene), EPT, EPR, epichlorohydrin, or an appropriate blend of these rubbers or polyurethane.

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 neutral belt 1 or the elastic body constituting the uneven portions, specifically, hard rubber having a hardness of 85° or more, hard polyurethane, or the like. ,
Phenol resin, epoxy resin, nylon resin,
Various resins such as polyester resin, acrylic resin, methacrylic resin, polyimide resin, reinforced resins made by mixing these resins with short fibers such as cotton yarn, chemical fibers, glass fibers, metal fibers, etc., or canvas impregnated with the above resins. It consists of a spiral shape or a layered material that is 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 is usually formed such that the upper block 2 has a horizontally elongated rectangular shape on its side, and the lower block 3 has an inverted trapezoidal shape on its side, and the contact surface with the belt 1 has a concave-convex fit that fits into the concave-convex shape of the neutral belt 1. The neutral belt 1 is shown in Figure 1.
The convex portion of the belt and the recessed portion of the upper and lower blocks 2 and 3 are fitted together, and the belt is fastened and fixed at a required pitch in the longitudinal direction of the belt by a fastening member 6 such as a bolt passing through the belt 1 and the upper and lower blocks 2 and 3. This may be reversed, that is, the block side may be a convex portion and the belt side may be a concave portion, or other convex-concave fitting shapes may be used.

Therefore, in the structure of the block as described above, the present invention has a feature that, as shown in FIG. The central part 2A has a small cross-sectional area.
A heat dissipating material made of a heat conductive material 7 such as a thin metal plate is attached to the.

The thermally conductive material 7 is a thin plate (foil) selected from the metals mentioned above, metal woven fabric, metal winding, etc., and its form of use is not particularly restricted, but it can be easily molded as shown in the figure by press processing etc. Sheet metal is most commonly used.

Since this thermally conductive material 7 is attached to the central part of the block where the cross-sectional area is small, the side surfaces are stopped by both end portions where the cross-sectional area is large.
It is not exposed on the sides.

Moreover, the thickness of the heat conductive material 7 is therefore determined by the difference in cross-sectional area, and an appropriate thickness of the heat conductive material 7 is determined accordingly.

Note that, as described above, attachment of the thermally conductive material 2 does not necessarily require adhesive.

Further, the heat conductive material 7 does not need to be applied to the entire periphery except for both side ends, and may be applied only partially as shown in FIGS. 1 and 2.

3 and 4 show other examples of how the heat conductive material is attached to the block according to the present invention. In FIG. 3, the heat conductive material 7 is attached longer than the thickness of the block; In the case of Figure 4, thin metal wires are wound spirally.

In particular, making the metal heat conductive material longer than the thickness of the block is effective in imparting a fin effect to the heat conductive material and further promoting heat dissipation.

Furthermore, in order to prevent the thermally conductive material from peeling off in the block of the present invention, it is also preferable to arrange a thin resin layer on the outer surface of the thermally conductive material.

In this way, 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 electric operation, the existence of a layer with good thermal conductivity in the center of the block prevents it from entering the atmosphere. Heat is dissipated, heat is not accumulated, and various adverse effects caused by heat generation can be prevented.Moreover, the cross-sectional area of the part that comes into contact with the pulley is small, so the thermal conductive material Since the thickness can be made sufficiently thick, it is more effective and smooth power transmission is ensured.

(Effects of the invention) As described above, the present invention has a high-load power transmission belt in which blocks are arranged along the longitudinal direction of the neutral belt. Since it is made smaller than the area and a member with good thermal conductivity is placed in this part, the heat generated in the belt can be dissipated into the atmosphere through the heat conductive material, preventing belt bending and blocking during high load transmission. Even if heat is generated due to friction or distortion between the belt and the belt, the heat will be dissipated and will not be stored in the belt. Therefore, the heat generated by the belt will not only deteriorate the rubber and reduce the rigidity of the block, but also cause damage to the adhesive material. In addition, in the belt of the present invention, the heat conductive material is installed with a smaller cross-sectional area in the center of the block where it does not come into contact with the pulleys, so the thickness of the heat conductive material can be reduced compared to the conventional belt. It is now possible to make it considerably thicker, and the heat dissipation effect can be greatly improved.
It is expected to have a significant effect on securing the transmission force of the belt and improving its durability.

[Brief explanation of the drawing]

FIG. 1 is a partial side sectional view showing an example of a high-load power transmission belt according to the present invention, FIG. 2 is an exploded perspective view of the upper block in FIG. 1, and FIGS. 3 and 4 are views of the block according to the present invention. FIGS. 5A and 5B are a partial side sectional view and a perspective view showing each modification example, and FIGS. a... High load transmission belt, 1... Neutral belt, 2, 3... Upper and lower blocks, 2a... Center portion, 2b... Side end portion, 4... Tensile rope, 5...
...Elastic body, 6...Adhesive material, 7...Heat conductive material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A neutral belt having irregularities, which is fitted into the irregularities at fixed pitches at right angles to the longitudinal direction, and blocks are placed above and below the belt, and fastened and fixed with fastening materials such as bolts or rivets. In the high-load power transmission belt, at least one of the upper and lower blocks is configured such that a center portion in the width direction of the belt that does not contact the pulley has a smaller cross-sectional area than both end portions that contact the pulley. A high-load power transmission belt characterized in that a thermally conductive material with good thermal conductivity is layered on at least the side of the area that contacts the belt. 2. Utility model registration claim 1, in which the layered heat conductive material is a thin plate, woven fabric, wrapped fine wire, or powder thin layer of a metal selected from aluminum, copper, silicon, nickel, magnesium, or an alloy thereof. high load transmission belt.