JPS627877Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a belt for high-load transmission with excellent lateral pressure resistance, and particularly to an improvement of a V-shaped cog belt for high-load transmission in which a trapezoidal block is tightened and fixed to a flat belt by penetrating bolts.

Recently, various studies have been conducted to improve the required transmission horsepower for high-load power transmission belts that require lateral pressure resistance. A bolt-through type power transmission belt has been proposed in which the reinforcing plate, flat belt, and trapezoidal block are passed through and tightened with bolts.

However, in the case of such a bolt-through type belt, the provision of the through hole requires cutting the belt tensile member rope, which inevitably leads to a significant decrease in strength, which has the disadvantage of impairing belt durability. . This not only reduces the transmission force of the belt, but also makes it difficult to determine the number of tensile ropes that are cut or damaged due to the through holes, resulting in large variations in belt quality.

Moreover, as belts become smaller and are required to carry higher loads, these problems become more apparent, resulting in fatal defects.

The inventor of the present invention has made various studies for some time in order to cope with the actual situation and eliminate these defects, and as a result, has proposed various improved high-load power transmission belts.

For example, one type of belt is a trapezoidal block and a bolt that can prevent longitudinal movement of the belt. In bolt-through type belts, the rope tensile body is wound and buried in a rubber-like elastic body avoiding the bolt penetration part, and a sag layer and canvas are placed on the surface of the flat belt, and the sag direction of the sag layer is the width of the belt. They are arranged sequentially so that they are located in the same direction.

However, in the case of a belt that fixes a block by passing through a bolt as described above, the fixation is done simply by fastening it with a nut, and in this case, the belt is only attached to the base of the bolt or the bolt contacting part of the inner surface of the nut. There is also the problem that the tightening force is concentrated and the bolt is likely to break at that point, and there is a concern that shearing deviation between the block and the flat belt will occur.

The present invention addresses these problems that have since become clear, and has heat resistance and high rigidity with a bending elastic modulus above a specified level at high temperatures, as well as improved belt flexibility and corner bending. The purpose is to avoid damage to the flat belt.

That is, the feature of the present invention is that a flat belt is made of a tensile rope and a canvas, and a sag layer is arranged on at least one of the upper and lower sides of the tensile rope so that the sag direction is located in the width direction of the belt. In a belt in which a trapezoidal block is tightened and fixed by passing through a bolt, the block is made of glass fiber-reinforced thermosetting resin, and the part in contact with the belt is chamfered, and the bolt is screwed into the bolt through hole of the block. It has a structure with engraved screws.

Here, the sudare layer refers to a woven fabric generally called sudare weave, which is formed by binding a large number of parallel cords in the horizontal direction with binding thread. The direction of the cord is the direction of sudare.

On the other hand, canvas is used for ordinary belt covering, and in the flat belt of the present invention, lamination with the sudare layer is essential, and by arranging the cords in the width direction of the sudare layer, it is possible to cover the belt longitudinally. It is distinguished from the lamination of multiple layers of canvas because it prevents the movement of trapezoidal blocks and bolts.

Hereinafter, specific embodiments of the belt of the present invention will be explained in sequence based on the accompanying drawings.

Figure 1 shows one of the high-load transmission belts according to the present invention.
An example is shown in the figure, where a is the main body of the high-load power transmission belt, b is the flat belt main body, and the flat belt main body b is made of NR (natural rubber), SBR as shown in FIG.
(styrene-butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), IIR (butyl rubber), Hypalon (chlorsulfonated ethylene)
On top of the rubber-like elastic layer 2 of the flat belt, which is made of a single material such as rubber or polyurethane rubber or an appropriate blend of these materials, is the above-mentioned sudare layer 3 and a nylon canvas, Kepler (trade name) canvas, or warp cotton yarn. Bias canvas or wide angle canvas 4
are sequentially laminated and pasted, and in the elastic layer 2, a high strength and low elongation tensile rope 1 such as polyester, aliphatic polyamide, aromatic polyamide, glass fiber or wire strand is spirally attached. At the bottom thereof, there is a sudare layer 3' similar to the above-mentioned upper sudare layer 3, and a stretchable layer made of the same material as the upper canvas 4 or woven with woolly-processed crimped nylon warp and normal nylon weft. A canvas 4' is layered.

Note that the flat belt main body b is simply the tensile rope 1.
It may also be made with only the top and bottom canvases 4, 4' and the top and bottom sagging layers 3, 3' between them.

Further, the flat belt main body b has a reinforcing plate 6 at its upper part, and a trapezoidal block 5 at its lower part facing each other. It penetrates a certain trapezoidal block 5 and is integrally tightened and fixed by a fastening material consisting of a bolt 7 and a nut 8.

Therefore, in the above configuration, the flat belt b
The sag layers 3 and 3' arranged above and below are arranged so that the sag direction is located in the belt width direction, and therefore, the twisted yarn cords constituting the sag are arranged in parallel in the belt width direction. .

On the other hand, the trapezoidal block 5 at the lower part of the belt main body is disposed perpendicularly to the longitudinal direction of the belt, and together with the reinforcing plate 6 on the upper surface of the belt, it is made of metal such as aluminum or its alloy, iron or its alloy, acrylic resin, nylon resin, etc. , polyester resin, polyimide resin, ABS resin, phenol resin, epoxy resin, etc., or a material such as FRP (reinforced resin) can be used at any time. , especially a thermosetting resin such as epoxy or phenol reinforced with glass fibers.

Phenol resin and epoxy resin are general-purpose thermosetting resins, and the above resins reinforced with glass fiber or glass fiber woven fabric are heat resistant and have a flexural modulus of 1500 kg/mm ² or more even at high temperatures of 100 to 150°C. ,
Highly rigid resin. Moreover, it also has the property of increasing the coefficient of friction by adding glass fiber.

Next, as shown in FIGS. 1 and 3, the shape of the trapezoidal block 5 is chamfered or rounded at the corner portion 5' in contact with the belt, which constitutes one essential part of the present invention. There is.
This not only increases the flexibility of the belt and prevents damage to the flat belt due to corners, but also has a significant effect in alleviating strength fatigue caused by the polygonalization of the tensile rope 1 shown in Figure 4. .

The means for fastening the flat belt main body b and the block 5 is, as described above, passed through the bolt 7 and fastened with the nut 8, but in the present invention, as shown in FIG. A thread 10, which is particularly threaded into the thread of the bolt 7, is carved into the bolt through hole 9 of the block 5, and the bolt 7 is screwed into the block 5, and is secured with a nut 8.

Of course, the nut 8 is not necessarily required in this case, but it is effective to use the nut 8 in order to spread the force evenly over the entire length of the bolt and extend the life of the bolt. It is also effective to use a thread locking agent to prevent the bolt from loosening from the block or nut.

Note that when screwing the bolt 7 through the belt, the position of the bolt through hole should be considered, and it is preferable that the bolt through hole be located at least 5 mm inward from both sides in the belt width direction.

In other words, in Fig. 5, the narrower the dimension is, the better in order to increase the belt strength, but if it is too small, it will not be able to support the shearing force between the block and the flat belt body, which will cause the block to shift and the belt to break. Desirably it is ≧5 mm.

The belt according to the present invention has been described above based on the drawings, but in the illustrated example, both the top and bottom layers 3, 3' and the canvas 4, 4' used in the present invention are one layer. , may be one of the upper and lower surfaces, and the number of layers is not limited to one layer, and the number of layers is selected as appropriate. In this case, the number of sagging layers 3, 3' and canvases 4, 4' does not necessarily have to be the same.
Furthermore, it is also preferable to form a recess in the lower surface of the flat belt body b into which the trapezoidal block 5 fits, and this is extremely effective in stopping the movement of the block and bolt in the longitudinal direction of the belt.

Thus, the above-mentioned belt corrects and eliminates the drawbacks of conventional high-load power transmission belts, and can be used in various fields as a high-load power transmission belt without deterioration in belt strength.

As described above, the power transmission belt of the present invention is a bolt-through type trapezoidal block fixed belt in which a sagging layer and canvas are laminated on the flat belt surface, glass fiber-reinforced thermosetting resin is used as the trapezoidal block material, and the corners in contact with the belt are The parts are chamfered and the bolt through holes of the blocks are threaded, so a sag layer is arranged on the surface of the flat belt, which is different from simply pasting canvas, and the trapezoidal block is formed by placing it in the direction of the sag. The movement of the bolt in the longitudinal direction of the belt is suppressed, the certainty and stability of the block installation is increased, and shear displacement between the block and the flat belt is prevented, and the material of the block is made of glass fiber-reinforced thermosetting resin. It has a bending elastic modulus above a specified level even at high temperatures, making it heat resistant and highly rigid.In particular, the belt contact corners of the block are chamfered, which improves belt flexibility and prevents damage to the flat belt due to corners. In addition, by threading the bolt into the block, the stress applied to the bolt is widely distributed over its length, preventing the bolt from breaking due to local concentration, thereby extending the life of the bolt. In addition to greatly improving the overall lateral pressure resistance of the belt, it also reduces the slip rate and prevents deformation, improving the transmission force per the same cross-sectional area, greatly improving durability and extending belt life. It has a remarkable effect on increasing.

[Brief explanation of drawings]

Figure 1 shows one of the high-load transmission belts according to the present invention.
A partially cutaway side view showing an example, Fig. 2 is a side cross-sectional overview showing an example of the configuration of a flat belt used in the belt of the present invention, and Fig. 3 is an enlarged view of the contact corner of the block of the belt of the present invention and the flat belt. , FIG. 4 is an explanatory diagram showing the state of the tensile member during use, and FIG. 5 is an explanatory diagram showing the bolt position. 1... Tensile rope, 2... Rubber-like elastic body,
3,3'...Sudare layer, 4,4'...Canvas, 5...
Trapezoidal block, 5'...corner chamfer, 6...
...Reinforcement plate, 7...Bolt, 8...Nut, 9...
Bolt through hole, 10...screw.

Claims (1)

[Claims for Utility Model Registration] 1. A flat belt having a tensile rope and a canvas, and a trapezoidal block formed on a flat belt having a sag layer arranged on at least one of the top and bottom of the rope so that the sag direction is located in the width direction of the belt. In the belt, the block is made of glass fiber reinforced thermosetting resin, and the part in contact with the belt is chamfered, and a screw is inserted into the bolt through hole of the block and screwed into the thread of the bolt. A high-load transmission belt characterized by being engraved with. 2. The high-load power transmission belt according to claim 1, wherein the thermosetting resin forming the blocks is a resin selected from epoxy and phenol. 3. The high-load power transmission belt according to claim 1 or 2, wherein the bolt through holes are located at least 5 mm inward from both sides in the belt width direction.