JPH0518516Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to high-load power transmission belts mainly used in speed change belts for automobile drives, etc., and in particular suppresses heat generation at the interface between blocks and neutral belts and reduces noise. The present invention also relates to the above-mentioned belt, which improves the transmission force and durability of the belt.

(Prior art) A high-load power transmission belt, in which blocks are arranged above and below at a fixed pitch at right angles along the longitudinal direction of a neutral belt and fastened and fixed with rivets, bolts, etc., is capable of adjusting the desired speed ratio of a variable speed belt drive device. Since it is possible to adopt a structure with a relatively small ratio of thickness to width in response to changes in speed, it has recently been widely used in various fields, including transmission belts for automobile drives, and many inventions and ideas are being developed.

By the way, the quality characteristics required for such high-load power transmission belts include (a) high torque durability, (b) high speed durability, (c) speed changeability, and (d) low noise characteristics. .

Regarding (a) high torque durability, high rigidity of the block is required to transmit high torque. However, when transmitting high torque, a large shearing force is generated between the block and the neutral belt.
Frictional force and heat generation due to strain and deformation at the interface cannot be avoided, and (b) regarding high-speed durability, a belt with good flexibility is required to withstand engine speeds of 5000 to 7000 rpm. To do this, it is necessary to release heat generated by bending.

Furthermore, in terms of (c) speed changeability and (d) low noise, it is necessary for the belt to move smoothly in the radial direction within the pulleys, and for this purpose it is desirable that the belt has a low coefficient of friction. However, lowering the coefficient of friction will inevitably lead to a reduction in the transmission force since it is generally a frictional transmission.

Therefore, it is necessary to prevent the transmission force from decreasing. On the other hand, as mentioned above, high rigidity of the block is required for high torque transmission, but such high rigidity increases the noise of collision with the pulley when the block moves in and out of the pulley, which is a major cause of noise. Become.

Therefore, in order to prevent noise, it is desirable that the friction number of the block be low.

As described above, various quality characteristics are desired for a high-load power transmission belt, and it is preferable for a high-load power transmission belt to have all of these characteristics. 61−
Nos. 48854, 48855, etc.) have advantages and disadvantages, and although they may be effective to some extent in terms of heat generation suppression, they are not necessarily satisfactory overall, such as not being sufficient in other characteristics. Needless to say, there was a need to develop even higher-load power transmission belts.

(Problems to be solved by the invention) In view of the above-mentioned actual situation, the present invention aims to further meet and significantly improve the quality characteristics required for the above-mentioned high-load power transmission belt by finding a new block structure. The purpose is to

(Means for Solving the Problems) Therefore, the feature of the present invention that meets the above-mentioned purpose is that the neutral belt has a convex or concave portion that fits into the above-mentioned block at right angles along the longitudinal direction. Fit the blocks at the specified pitch,
In a high-load power transmission belt fastened and fixed with fastening materials such as bolts and rivets, the block has a three-layer structure as described below.

In other words, synthetic resins such as nylon, epoxy, phenol, and polyimide are mixed with lubricants such as molybdenum, graphite, oil, and wax to reduce the friction coefficient. Reinforcing resins such as FRP, such as nylon, epoxy, phenol, and polyimide, as well as reinforcing materials such as glass, cotton, nylon, etc.
A rigid layer made of a reinforcing resin impregnated with or mixed with fibers such as PET, aramid, metal fibers, whiskers, etc. alone or in combination, or woven fabrics including woven fabrics made of these fibers, and furthermore, the outer layer is made of aluminum, copper, silicon, or nickel. ,magnesium,
It has a three-layer structure with a heat dissipation layer made of a metal coated with foil, powder, or thermal spraying of a metal selected from the above or an alloy thereof.

Note that the heat dissipation layer is not necessarily limited to the outermost layer, and there is no problem even if the outer layer further includes a protective layer such as a resin layer or an FRP layer that does not impede the heat dissipation effect. , included in this invention.

(Function) Using a block consisting of the three-layer structure as described above,
When these blocks are placed above and below the neutral belt and fastened and fixed with rivets, each layer of the block has the following functions.

In other words, in order to transmit high torque as a high-load transmission belt, high rigidity of the block is required.
In such a case, when high torque is transmitted, shearing force is generated between the block and the neutral belt, and heat generation occurs due to frictional force at the interface, but the rigid layer and heat dissipation layer of the block in the present invention satisfy both of the above requirements and are capable of transmitting high torque. It also dissipates heat.

Furthermore, in order to withstand the engine speed of 5000 to 7000 rpm with the belt of the present invention, a belt with good flexibility is required, but even in this case, heat generation occurs due to bending. The heat dissipation layer also dissipates such heat generation.

Furthermore, the belt of the present invention is required to move smoothly within the pulley without reducing the transmission force, and the friction coefficient is adjusted to an appropriate level depending on the type and filling amount of the lubricant to meet this requirement. do.

Moreover, the smooth movement of the block into and out of the pulley eliminates the noise that occurs when the pulley moves in and out, contributing to the improvement of quality characteristics required for a high-load transmission belt.

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

FIG. 1 shows an example of a high-load power transmission belt according to the present invention, and FIG. 2 shows the structure of blocks forming the main parts of the belt.

In these figures, a is a high-load transmission belt, 1 is a neutral belt having upper and lower unevenness, 2 and 3 are
The upper and lower blocks are arranged at a fixed pitch vertically along the longitudinal direction of the neutral belt 1, and constitute the essential parts of the present invention. The neutral belt 1 is covered with a spiral tension rope 4 and has an elastic body 5 layered thereon. Although not shown, canvas is attached to the upper surface or the upper and lower surfaces 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, etc. ,
Phenol resin, epoxy resin, nylon resin,
Each resin such as polyester resin, acrylic resin, methacrylic resin, polyimide resin, or a reinforced resin made by mixing these resins with short fibers such as cotton thread, chemical fiber, glass fiber, or metal fiber, or a canvas impregnated with the above resin is swirled. It consists of a 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 material 6 is caulked and fixed with a predetermined pitch in a direction perpendicular to the longitudinal direction of the belt.

In addition, in the above configuration, the upper and lower blocks 2,
3, the above-mentioned block 2 is usually formed in a horizontally elongated rectangular shape on the side, and the lower block 3 is formed in the shape of an inverted trapezoid on the side, and the contact surface with the belt 1 has irregularities that fit into the irregularities of the neutral belt 1. It has a mating shape, and in Figure 1, the neutral belt 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 is characterized in that, as an example is shown in FIG. It has a three-layer structure, each of which maintains the characteristics of high torque durability, high speed durability, shifting performance, and low noise.

Here, the respective thicknesses of the slip layer 7, rigid layer 8, and heat dissipation layer 9 are determined as appropriate, but the specific materials thereof have already been described in detail earlier, so a description thereof will be omitted here.

As mentioned above, in order to prevent the heat dissipation layer 9 from peeling off in the block of the present invention, a resin protective layer may be further disposed on the outer surface thereof.

Thus, when the above-mentioned high-load transmission belt is used as a speed change belt for automobile drive, etc.,
Even if heat is generated, it can be dissipated to prevent the harmful effects of heat generation, and it also has high torque and high-speed durability, ensuring smooth power transmission with little noise.

(Effects of the invention) As described above, the present invention has the structure of a high-load power transmission belt in which a block is fastened and fixed to a neutral belt, with a slip layer as a core layer, and a rigid layer and a heat dissipation layer sequentially arranged on the outside. The outer heat dissipation layer dissipates heat caused by interfacial friction force due to the shear force between the neutral belt and the blocks that occurs during high torque transmission, as well as heat caused by bending that occurs at high speeds. In addition to being able to prevent rubber deterioration and block rigidity reduction due to heat generation, the presence of a rigid layer ensures the rigidity necessary for high torque transmission and improves transmission force. Furthermore, the presence of the slip layer in the core layer allows the belt to move smoothly in the radial direction within the pulley during gear shifting by adjusting the appropriate coefficient of friction, and due to its rigidity, it is able to adjust the friction coefficient when the block moves in and out of the pulley. It is expected to reduce the collision noise generated and the noise generated when the belt moves in the radial direction of the pulley, ensure the transmission force of the belt, and improve the quality characteristics required for high-load transmission belts.

[Brief explanation of the drawing]

FIG. 1 is a partial side cross-sectional view showing one example of the high-load power transmission belt of the present invention, and FIG. 2 is a schematic cross-sectional view showing the structure of blocks forming the essential parts of the present invention in the belt. a... High load transmission belt, 1... Neutral belt, 2, 3... Upper and lower blocks, 6... Adhesive material, 7... Slip layer, 8... Rigid layer, 9... Heat dissipation layer.

Claims (1)

[Utility Model Registration Claims] 1. A high-load transmission belt comprising blocks arranged at a fixed pitch perpendicular to the longitudinal direction of an uneven neutral belt and fastened with fastening materials such as rivets, characterized in that the blocks are configured as a core of a lubricating layer made of a resin material in which a lubricant is mixed into synthetic resin to reduce the coefficient of friction, and a heat dissipation layer made of metal with good thermal conductivity arranged on the outside via a rigid layer made of reinforced resin. 2. A high-load transmission belt as described in Utility Model Registration Claim 1, in which the resin material of the lubricating layer is a synthetic resin such as nylon, epoxy, phenol, polyimide, etc. mixed with a lubricant such as molybdenum, graphite, oil, wax, etc. to reduce the coefficient of friction. 3. A high-load transmission belt as described in Utility Model Registration Claim 1, in which the reinforced resin of the rigid layer is a synthetic resin such as nylon, epoxy, phenol, polyimide, etc. mixed with a lubricant such as glass, cotton, nylon, PET, aramid, metal,
A high-load transmission belt according to claim 1 or 2 of the utility model registration, which is a resin reinforced with fibers or woven fabrics consisting of whiskers or the like, either alone or in combination. 4. A high-load transmission belt according to claim 1 or 2 of the utility model registration, in which the heat-dissipating layer is coated by foil, powder or spraying of a metal selected from aluminum, copper, silicon, nickel, magnesium or an alloy thereof.
5. A high load power transmission belt according to claim 1, 2, 3 or 4, wherein the heat dissipation layer is protected by a protective resin layer to an extent that the heat dissipation effect is not impaired.