JPH0537072Y2 - - 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 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 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 can't help but be invited.

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

(Problems to be solved by the invention) The present invention deals with the above-mentioned actual situation by disposing a thin layer with good thermal conductivity on the surface of the block that comes into contact with the neutral belt, and also placing the thin layer on the side surface of the belt. By exposing the belt, the heat generated in the belt is dissipated into the atmosphere, thereby suppressing heat generation or heat accumulation in the belt.

(Means for Solving the Problems) That is, the present invention is characterized in that in a high-load power transmission belt in which blocks are fastened and fixed vertically at fixed pitches along the longitudinal direction of the neutral belt, A thin layer of aluminum or the like having good thermal conductivity is formed on the surface of the block that comes into contact with the belt, and the thin layer is exposed on the side of the belt that comes into contact with the pulley.

Here, the shape of the block is not particularly limited, and various conventionally known shapes are included, but the top surface of the upper block,
A block further provided with a convex portion on the lower surface of the lower block may also be used.

The thin layer with good thermal conductivity may be applied only to at least the portion of the block that comes into contact with the belt, but it is more preferable that the thin layer covers the periphery of the block except for the side surfaces.

The thin layer with good thermal conductivity may be applied to both the upper and lower blocks, or only to one of the blocks, but preferably to both blocks.

The thin layer with good thermal conductivity used is a metal such as aluminum, copper, iron, or brass, and these can be made into a block in the form of a thin plate, a woven fabric, or a thin powder layer made by mixing the metal powder into a resin. to cover or cover.

(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.

Furthermore, since a thin layer is exposed on the side surface of the block and is in contact with the pulley, heat is dissipated into the atmosphere through the pulley as well, completely suppressing heat generated by the belt. In particular, if the pulley has fins or the like, the dissipation effect is great.

(Embodiments) Hereinafter, embodiments of the present invention will be 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 bodies 5 are arranged in layers, and although not shown, canvas is attached to the upper or upper and lower surfaces of the elastic bodies as 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 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 made by mixing these resins with short fibers such as cotton thread, chemical fiber, glass fiber, metal fiber, etc. It is made of canvas impregnated with the resin described above, which is formed into a spiral shape or layered and molded and hardened.

The blocks 2 and 3 are normally arranged on at least one of the upper and lower surfaces of the belt 1, and in the case of the illustrated embodiment, on both the 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, as for its shape, the lower block 2 is usually formed in a horizontally long rectangular shape on the side, and the contact surface with the belt 1 has a concave-convex fitting shape that fits into each other, and in FIG. With the concave portion of the belt 1 and the convex portions of the upper and lower blocks 2 and 3 fitted together, 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 concave portion and the belt side may be a convex portion, or other convex-concave fitting shapes may be used.

Moreover, in FIG. 1, both the upper and lower blocks 2 and 3 have convex portions formed on the upper surface of the upper block 2 and the lower surface of the lower block 3, respectively.

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 thin layer with good thermal conductivity, which is an important part of the present invention, and in FIG. 1, the thin layer 7 is formed around the upper and lower blocks except for the side surfaces that contact the pulleys.

Of course, this is effective to some extent not only for both the upper and lower blocks, but also for only one block.

Furthermore, the thin layer 7 with good thermal conductivity may be placed only on the surfaces where the belt 1 and the blocks 2 and 3 are in contact, as shown in FIG. 2, without having to cover the entire periphery except for the side surfaces. In either case, it is important that the thin layer is exposed on the side surface of the belt that contacts the pulley when the belt is wound around the pulley.

In this case, belt heat is dissipated to the atmosphere via the pulley, and by providing fins or the like on the pulley, the heat dissipation effect can be further enhanced.

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, the heat is dissipated into the atmosphere due to the presence of a thin layer with good thermal conductivity. This prevents heat generation from being accumulated, prevents various problems caused by heat generation, and ensures smooth operation transmission.

(Effects of the invention) As described above, the present invention provides a high-load power transmission belt in which blocks are arranged along the longitudinal direction of the neutral belt, and a thin layer of metal or the like having good thermal conductivity is applied to the contact surface of the blocks with the belt. At the same time, the thin layer is exposed on the side of the belt, and the heat generated in the belt can be dissipated into the atmosphere through the thin layer, which prevents belt bending and the gap between the block and the belt during high load transmission. Even if heat is generated due to friction or distortion, the heat is transferred from the thin layer to the pulley and released, and is also radiated from the surface of the block so that the heat is not stored in the belt. This has the effect of ensuring the transmission force of the belt and improving its durability, without causing deterioration of the rubber or decrease in the rigidity of the block, or even loosening of the fastening material.

[Brief explanation of the drawing]

1 and 2 are partial cross-sectional views in the longitudinal direction of the belt showing each embodiment of the high-load power transmission belt of the present invention. a... High load transmission belt, 1... Neutral belt, 2, 3... Upper and lower blocks, 4... Tensile rope, 5... Elastic body, 6... Fastening material, 7... Thermal conductivity Good thin layer.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A high-load power transmission belt formed by fitting blocks vertically at required pitches at right angles to the longitudinal direction of a neutral belt having unevenness and tightening them with fastening materials such as bolts and rivets. A high-load power transmission belt, characterized in that a thin layer with good thermal conductivity is formed on the surface of at least one of the blocks in contact with the belt, and the thin layer is exposed on the side surface of the belt in contact with the pulley. 2. The high-load power transmission belt according to claim 1, wherein a thin layer with good thermal conductivity is applied to the entire periphery of the block except for the side surfaces. 3 Claims for utility model registration in which the thin layer with good thermal conductivity is a thin plate made of aluminum, copper, iron, magnesium, tin, zinc, tungsten, nickel, molybdenum, gold, silver, silicon, zirconium, bismuth, or an alloy thereof. The high-load power transmission belt according to item 1 or 2. 4 A woven fabric in which a thin layer with good thermal conductivity is made of aluminum, copper, iron, magnesium, tin, zinc, tungsten, nickel, molybdenum, gold, silver, silicon, zirconium, bismuth, or an alloy thereof, or two or more of them. The high-load power transmission belt according to claim 1 or 2, which is made of cloth.