JPH0538267Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a power transmission belt in which blocks are disposed above and below at required pitches along the longitudinal direction of the belt, and in particular, the fitting of one block with the belt is difficult. The present invention relates to a high-load power transmission belt that has a concave-convex fit and uses a plate with good heat conductivity for the upper block to reduce weight and improve the cooling effect.

(Prior art) A V-belt generally wraps around a pulley and transmits power by the frictional force at the interface between the pulley and the belt, so it is easy to wrap around the pulley. The belt needs to have low buckling and high rigidity to withstand the pressure between the pulley and the belt to generate sufficient pressure.

Therefore, in order to improve the lateral pressure resistance of the above-mentioned belt, wood, highly rigid metal rods, pipes, resin pipes, resin rods, etc. are used for the belt cogs.
Furthermore, it has been proposed to use canvas impregnated with rubber or thermosetting resin and formed into a spiral shape (for example, Utility Model Application No. 58-48727).
Various block belts have been proposed in which blocks are placed above and below.

FIG. 4 shows a typical example of the above-mentioned block belt, in which a block 4 is placed on the lower surface of the belt 1 base, in which the rope tensile member 3 is buried in parallel in the rubber-like elastic member 2, that is, on the side in contact with the pulley P. Blocks 5 are arranged at a required pitch in the longitudinal direction, and blocks 5 are also arranged on the upper surface of the belt, and these blocks are integrally tightened and fixed with bolts 6 or the like.

However, in the case of a belt with blocks arranged as described above, the side surfaces of the upper and lower blocks 4 and 5 are both in contact with the pulley P, and when a load is applied, the frictional force between the pulley and the belt interface is reduced. This has the disadvantage that the belt generates heat, which tends to cause belt deterioration.

Furthermore, during high-load transmission, the belt gradually generates heat due to bending, friction between the block 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. Invite.

Therefore, as a measure to deal with this heat generation, the material of the upper block may be made of aluminum or aluminum alloy (Utility Application No. 159905/1983), or the block may be mixed with powder with good thermal conductivity, or it may be possible to Forming a thin layer with good properties (Utility Application No. 61-48854,
48855) have been considered.

(Problems to be solved by the invention) However, even though each of the above configurations partially has its own role, it is still not sufficient as a whole, and various more extensive modifications are required. be.

The present invention responds to the above-mentioned facts and specifically meets the above requirements by configuring the upper block in a non-contact relationship with the pulley, and by specifying the fit between the belt and the block and the material of the upper block. The purpose is to suppress heat generation or heat accumulation in the belt and ensure suitable performance as a high-load transmission belt.

(Means for Solving the Problems) That is, the present invention is characterized in that, in a high-load power transmission belt having upper and lower blocks at a required pitch at right angles along the longitudinal direction of the belt, at least one of the upper and lower blocks is connected to the belt. The upper block is made of a thermally conductive material that fits into the unevenness provided on the base, and has a cooling convex part formed on the upper part, and the side surface of the block along the longitudinal direction of the belt is an extension of the side surface of the belt base. The upper block is located inward from the surface so that the side surface of the upper block does not come into contact with the pulley when it is suspended on the pulley.

Here, the belt base is NR (natural rubber), SBR
(styrene-butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), IIR (butyl rubber),
Hypalon (chlorsulfonated polyethylene)
Polyester, aliphatic polyamide, aromatic polyamide (trade name: Kevlar), glass fiber, or high-strength wire strands are used inside the rubber elastic layer made of a single material such as rubber or polyurethane rubber, or a blend of these materials. It is made by embedding low elongation rope tensile bodies in parallel, and if necessary, bias canvas or wide-angle canvas made of cotton, nylon, polyester, or a blend of these are laminated and pasted on the top and bottom. .

Then, blocks are arranged vertically orthogonally to the above-mentioned belt base at required pitches along its longitudinal direction, but the lower blocks are made of synthetic resin such as epoxy resin, phenol resin, polyimide resin, or melamine resin. In addition, canvas impregnated with the above resin or canvas wrapped in a spiral shape, canvas with short fibers mixed in the resin, or canvas coated or glued with a rubber-like elastic body for the belt base are laminated. Alternatively, it may be wound in a spiral shape, or it may be made of hard rubber with a hardness of 85° or more that is the same as that used for the belt base.

On the other hand, as the main structure of the present invention, the upper block is made of a thermally conductive material with good thermal conductivity.

This thermally conductive material is used for the upper block as a thin plate or woven fabric layer, but thin plates with good thermal conductivity include Al, Cu, Fe, Mg, Sn, Zn, W, Ni,
It is a thin plate made of Mo, Ag, Si, Zr, Bi, or an alloy thereof, and a woven fabric with good thermal conductivity is a fabric woven using one or more of the above metals or alloys.

Also, those formed by pressurizing and solidifying the above-mentioned metal or alloy powders may also be used.

Note that the upper block is not a simple rectangular thin plate but is formed in a shape having a convex portion for cooling on its upper surface, which improves the heat radiation fin effect.

Furthermore, in the present invention, a neutral belt is used in which the belt itself has concave and convex portions so that at least one of the upper and lower blocks fits the belt in a concave and convex manner, and the upper block is further designed to prevent contact with the pulleys. The upper block can be formed into various shapes such as a rectangle whose maximum width is the belt base width and whose long sides are shorter than that, or a trapezoid whose lower base is the belt base width.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partial side sectional view in the longitudinal direction of a belt according to the present invention, and FIG. 2 is a sectional view in the belt width direction when the belt is suspended on a pulley.

In these figures, the belt of the present invention consists of a belt base 1 forming the center and upper and lower blocks 4 and 5 located above and below it, and the belt base 1 has a rope tension member 3 embedded in a rubber-like elastic body 2. However, it is a neutral belt having a convex portion that protrudes upward and downward, and the blocks 4 and 5 fit the concave portion into the convex portion of the belt base 1, and are integrally attached to the belt base 1 with the bolt 6 through the concave and convex fitting. It is properly tightened and fixed.

In the above structure, the upper block 5 is made of the metal or alloy thereof, and has a rectangular cross section in the width direction with the long side being narrower than the belt width of the belt base 1. Both side surfaces are located within an extension plane of both side surfaces of the belt base 1 and are not in contact with the pulley P at all.

As shown in the side cross-sectional view of FIG. 3, a convex portion is integrally formed on the upper part of the upper block 5 for dissipating the heat from the heat conductive material constituting the upper block 5.

Of course, the lower block 4 is not limited to the above-mentioned structure, and is made to come into contact with the pulley from a surface that improves the power transmission force by the frictional force of contact with the pulley.

Therefore, the lower block 4 is made of ordinary block constituent materials, and when the belt is suspended on the pulley P and pulled, the side surface of the lower block 4 contacts the inner wall surface of the pulley P, but the side surface of the upper block 5 contacts the inner wall surface of the pulley P. do not contact, but merely share the stiffness of the lower block 4.

In FIG. 1, with the convex portion of the belt base 1 and the concave portions of the upper and lower blocks 5 and 4 fitted together, the belt is fixed at a required pitch in the longitudinal direction by a fastening member 6 such as a bolt passing through the belt base 1 and the upper and lower blocks. Although they are fastened and fixed, 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.

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 by the upper block with good thermal conductivity.
Heat generation is not accumulated, various adverse effects caused by heat generation can be prevented, and smooth power transmission is ensured.

(Effects of the invention) As described above, the belt of the invention has good thermal conductivity because at least one of the upper and lower blocks has a concave-convex fit with the belt, and the upper block has a convex portion for cooling on its upper surface. The pulley is made of a flexible material and is configured so that its side surface does not come into contact with the inner wall surface of the pulley, and has the following effects.

(1) The upper block is made of a material with good thermal conductivity and has a convex part on the top surface for cooling, so even if heat is generated at the interface between the belt and the block,
Heat is radiated through the upper block, producing a cooling effect.
Prevent belt deterioration.

(2) Since one of the upper and lower blocks is connected to the belt by a concave-convex fit and is fastened and fixed together with a fastening material to prevent the upper block from coming into contact with the pulley, it is possible to prevent the upper block from coming into contact with the inner wall of the pulley. This eliminates concerns about the belt falling off and shortened belt life that would be expected due to the low lateral pressure sharing ratio, and also maximizes the rigidity of the upper block to the lower block, improving power transmission force. To contribute.

(3) When transmitting a load, even if the lower block sinks into the pulley and the upper block sinks along with it, both sides of the upper block will not warp up, so no excessive force will be applied to the bolt, and the bolt will not break. This also eliminates concerns about the upper block breaking down.

(4) Since there is no collision or slippage between the pulley and the upper block, abnormal noises caused by both can be avoided.

[Brief explanation of the drawing]

Fig. 1 is a partial schematic cross-sectional view in the longitudinal direction of the belt showing an example of the belt of the present invention, Fig. 2 is a cross-sectional view of the same belt in the width direction, Fig. 3 is a side sectional view of the upper block, and Fig. 4 is a schematic cross-sectional view of the belt according to the present invention. FIG. 3 is a cross-sectional view of the belt in the belt width direction. 1... Belt base body, 2... Rubber-like elastic body, 3...
...Rope tension body, 4...Lower block, 5...Upper block, P...Pulley.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of a belt base in which low-elongation, high-strength rope tension bodies are embedded in parallel in a rubber-like elastic body, blocks are arranged above and below at required pitches in the perpendicular direction along the longitudinal direction. In the belt, at least one of the upper and lower blocks is provided with unevenness on the belt base and is fitted into the unevenness, and at least the upper block is formed with a heat conductive material layer with a cooling projection formed on the upper part, and , the side surface of the block along the longitudinal direction of the belt is located inward from the extended surface of the side surface of the belt base body, and the upper block is formed so that the side surface does not come into contact with the pulley when the block is suspended on the pulley. transmission belt. 2. A thin plate whose thermally conductive material layer is made of aluminum, steel, iron, magnesium, tin, zinc, tungsten, nickel, molybdenum, silver, gold, silicon, zirconium, bismuth, or an alloy thereof, or a fabric made of one or more of the above metals. A high-load power transmission belt according to claim 1 of the utility model registration claim.