JPH0232912Y2 - - 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, in the past, various measures have been taken to deal with such heat generation, but most of them have been indirect measures such as loosening of bolts due to the heat generation, and no attempt has been made to suppress the heat generation itself. .

Therefore, the inventors of the present invention dealt with the above-mentioned situation by placing a thin layer with good thermal conductivity on the surface of the block that comes into contact with the neutral belt, thereby dissipating the heat generated in the belt into the atmosphere. In order to suppress heat generation or heat accumulation, firstly, 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, the surface of block B in contact with the belt is As shown in FIG. 4, we proposed forming a thin layer A with good thermal conductivity such as aluminum, or dispersing and mixing a powder material with good thermal conductivity into the upper and lower blocks. (Jitsugan No. 61-48854,
(No. 48855) (Problem to be solved by the invention) However, in the case of forming a thin layer as shown in Fig. 4 above, the metal material with good thermal conductivity forming the thin layer is different from the resin material forming the block. Therefore, it has been found that when heat generation is repeated, peeling gradually occurs from the interface between the two, which tends to lead to damage to the belt.

That is, the object of the present invention is to prevent separation between such a resin material and a thin layer having good thermal conductivity.

(Means for Solving the Problems) Therefore, the feature of the structure of the present invention that meets the above object is that the neutral belt has a convex or concave portion that fits into the above-mentioned block along the longitudinal direction. In high-load power transmission belts, blocks are fitted one above the other at a fixed pitch at right angles, and the belts are firmly fixed with bolts, rivets, or other fastening materials. is formed, and a resin layer is further layered on the outside thereof, and the thin layer with good thermal conductivity is substantially
The point is that it was buried.

Here, the shape of the block does not particularly matter; conventionally,
Although various known shapes are included, a block having convex portions on the upper surface of the upper block and the lower surface of the lower block is extremely effective in promoting heat dissipation due to the fin effect.

Further, the thin layer having 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 to cover the periphery of the block except for the side surfaces with the thin layer.

The thin layer with good thermal conductivity may be applied to both the upper and lower blocks, or only one, and preferably 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 thin plate, a woven fabric, or a thin powder layer made by mixing resin with the metal powder. to cover or cover.

On the other hand, the resin applied to the outside is preferably the same resin as the block.

(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 thin layer is embedded inside by the outer resin layer, it can withstand long-term use without peeling.

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. In particular, if the pulley has fins or the like, the dissipation effect will be greater.

(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 bodies 5 are arranged in layers, and although not shown, canvas is applied 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 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, or reinforced resins in which short fibers such as cotton yarn, chemical fibers, glass fibers, and metal fibers are mixed into these resins, 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 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 right angle 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 oblong 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 convex portion of the belt 1 and the concave 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. However, this may be the reverse case, and other concave-convex fitting shapes may also be used.

Moreover, in the above-mentioned FIG. 1 and FIG. 2 showing the details, both the upper and lower blocks 2 and 3 are
is the top surface of its upper block 2, and its lower block 3.
Convex portions 2a and 3b are respectively formed on the lower surface of the .

This is due to the thin layer buried structure with good thermal conductivity.
This is because it is advantageous in increasing the area of contact with the atmosphere and in promoting heat dissipation by acting as a fin.

However, as shown in FIG. 3, a structure without a convex portion may also be used.

However, in the block configuration as described above,
Reference numerals 7 and 8 indicate a thin layer with good thermal conductivity and a resin layer on the outside thereof, which are the essential parts of the present invention. A thin layer 7 and an outer resin layer 8 are deposited.

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

Further, the thin layer 7 and the outer resin layer 8 having good thermal conductivity may be arranged only on the contact surfaces of the belt 1 and the blocks 2 and 3, without having to cover the entire periphery except for the side surfaces. .

In particular, in the latter 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 the accumulation of heat and prevents various problems caused by heat generation.Moreover, the outer resin layer prevents the thin layer from peeling off, ensuring smooth power transmission over a long period of time. .

(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. The belt is formed by adhesion, and a resin layer is further placed on the outside.The heat generated in the belt can be dissipated into the atmosphere through the thin layer, and the belt bends during high load transmission, and the block and belt Even if heat is generated due to friction or distortion of the belt, the heat is dissipated and is not stored in the belt. Therefore, the heat generated by the belt does not only deteriorate the rubber and reduce the rigidity of the block, but also prevents the fastening material from loosening. Moreover, the outer thin resin layer reliably maintains its position without any pressure, and it is firmly integrated with the block and does not peel off, ensuring the belt's transmission force over a long period of time and increasing its durability. It has the effect of improving the

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view in the longitudinal direction of the belt showing an embodiment of the high-load power transmission belt of the present invention, Fig. 2 is an enlarged view of the same block, Fig. 3 is a sectional view showing another shape of the block, and Fig. 4 is a conventional belt. FIG. 3 is a sectional view showing the block structure of FIG. 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, 8...outer resin 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 outer surface of at least one of the blocks in contact with the belt, and a resin layer is further arranged on the outer side of the thin layer. 2. The high-load power transmission belt according to claim 1, in which a thin layer with good thermal conductivity is embedded in the entire periphery of the block except for the side surfaces. 3. A utility model registration claim described in paragraph 1 or 2, in which the thin layer with good thermal conductivity is a thin layer of a thin plate, woven fabric, or powder made of a metal with good thermal conductivity such as aluminum, copper, iron, or brass. high load transmission belt. 4. The high-load power transmission belt according to claim 1, 2, or 3, wherein the outer resin layer is made of the same material as the block.