JPS5846242A - Power transmitting belt - Google Patents

Abstract

PURPOSE:To improve the fitting state between the belt and the pulley to reduce the loss of power transmission by unitarily connecting the upper surfaces of a plurality of V-belt main bodies by means of a tie-band having contraction only in the vertical direction. CONSTITUTION:The top parts of the V-belt main bodies are unitarily connected by a sheet of a tie-band T made by coating the upper and lower surfaces of an expansible shrinkable canvas 5 with rubber. The tie-band T is constituted by embedding the canvas 5 using a low-orientation polyester yarn of an elongation of more than 80% for warps 5a and a cotton yarn or the like for wefts 5b into a soft rubber 4 having the same properties as those of rubbers 2 and 3 of V-belt main bodies. Together with the expansion and contraction in the vertical direction, the variation of tolerance in the width direction toward the lateral direction of the tie-band is reduced, to improve the fitting state between the belt and the pulley and completely remove the loss of power transmission.

Description

[Detailed Description of the Invention] Regarding the improvement of the so-called multi-strand V-belt that transmits a large amount of power between pulleys, vibrations of the belt that occur during driving have been solved. It prevents accidents such as overturning, eliminates power transmission loss due to uneven belt lengths (improves belt life, and improves the flexibility of the lower surface of the belt,
The purpose is to improve the slippage between the belt and the pulley, making it easier to pull out the belt, and to significantly reduce the noise that is generated during high-speed rotation.

In the conventional multi-belt drive, multiple belts are individually wrapped around a boob with multiple V-grooves. When used to drive machines with large impact forces, such as belts, each belt tends to vibrate independently, and the movement causes contact with an adjacent belt, causing the belt to overturn.

There is a tendency for separation phenomenon to occur and early failure, and only %V
Since belts are usually friction transmission, it is necessary to apply an initial belt tension according to the transmitted horsepower, but with conventional multi-strand V-belts, the belt tension becomes uneven due to uneven lengths.
As a result, there has been a problem in that it tends to cause belt vibration and a reduction in belt life.

Therefore, in order to solve this problem, power transmission belts in which the upper surfaces of individual V-belt bodies are connected with wide-angle canvas tie bands, and power transmission belt boats in which nylon side sag is used as the tie bands have been proposed. In the former case, since a wide-angle canvas is used, even though the vertical elongation is large and good, the transverse angle becomes small, resulting in poor elasticity and poor fit between the belt and pulley. In the case of L7, the joint condition is poor and the tie hunt and belt are likely to separate, and in the latter case, although the longitudinal elasticity is good, when used with a small pulley diameter, the rubber interposed in the sag It is subject to extreme expansion and contraction, and the rubber tends to crack, and since nylon tape record is used in the lateral direction, it has poor elasticity, and as with the former, there are problems in that the fitting condition is poor.

The present invention was finally achieved as a result of intensive research by the present inventors in order to solve the above-mentioned immediate problems. By integrating the structure with a tie hand that is stretchable only in the vertical direction, this combined with the I-filling property of the vertical force crystal reduces the number of changes in the width of the tie band in the horizontal direction and improves the relationship between the belt and pulley. Hereinafter, specific contents of the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 shows an example of a power transmission belt according to the present invention. The tensile body of each V-belt body is made of high-strength fiber such as aromatic polyamide, (2) is its compressed rubber layer, (3) is an onion rubber layer, and each V-belt body has a bias-shaped rubber made of cotton thread. The V-belt bodies are covered with a canvas (6), and the tops of the V-belt bodies are integrally connected to the upper and lower surfaces of the stretchable canvas (5) by a single tie band (T) coated with rubber.

Tie band (η is a warp (5a) made of low-oriented polyester yarn with an elongation of 80% or more, and a weft (5b) made of cotton yarn, nylon/
The main part of the present invention is constructed by embedding a canvas (5) made of thread, polyester thread, etc. in the flexible rubber (4) of the same quality as the rubber (21, (31) of the V-belt main body. As for the canvas which has stretchability in the longitudinal direction, it is usually a plain weave canvas, but it is also effective to use a twill weave canvas.

00"r: The low-orientation chill yarn used in the present invention is one that is used when hot-drawing polyester fiber yarn under gentle stretching conditions, that is, in a relaxed state. Through the treatment, it is possible to easily obtain a polyester elastic yarn with an elongation of 80% or more, which has a loose crystal orientation and still has elasticity.

Figures 3 and 4 are structural diagrams showing an example of the canvas used as the tie band of the above-mentioned power transmission belt. A warp (5a) made of thread and a weft (5a) made of ordinary nylon thread, cotton thread, polyester thread, etc.
5b) in the twill weave structure.

In this twill weave canvas (5), as shown in the weave diagram in Figure 4, the warp (A) first presses the weft (A)' and floats above it, and then the next weft (the opening r, the hornbeam) floats on top of it. The warp (B) on the right sinks under the weft (A) and then appears on the cloth surface and floats on top of the next thread (2)'. )', sinks under the weft (/pu, ni)', and then the warp (c) sinks below the weft (a)' elongation Y6, and then floats above the weft ezu. The structure of this structure is that the weft (in') sinks under the warp (a) and floats continuously above the warp (b) and (c). The weft (b)' floats on the warp (a), sinks under the warp (b), then floats on the warp (c), and the next weft (c)' floats on the warp (a). , (B) continuously floats above the next warp (C), and sinks under the next warp (C). By combining the warp and weft in this way, the warp float and the weft float gradually become 9 on the right shoulder. A diagonal line running from the bottom left to the top right appears on the fabric surface.It should be noted that the tie band (T) consisting of the immediate structure shown in Figures 3 and 4 above Regarding the connection mode with the V-belt, since the warp (5a) of the elastic canvas (5) of the tie band (no) is a low-oriented polyester yarn with elasticity, it is placed at a wide angle of the conventional tie band. It is not necessary to do so, and it is effective to arrange the stretchable canvas (5) at 90' with respect to the longitudinal direction of each belt as shown in the notch in Figure 1. Furthermore, the tie band (T) is The rubber (4) in which the canvas (5) is buried is V
Since it is made of the same rubber as the belt main body rubber (21, (31), it can be bonded with adhesive, but it is preferable to vulcanize it and make a strong connection during vulcanization.

On the other hand, FIG. 2 shows another embodiment of the power transmission belt according to the present invention, in which the structure and connection mode of the tie band (T) are the same as in the case of FIG. 1, except for the V-band.

The bottom of the main body is made of one or more layers of warp, rubberized bar ear canvas made of cotton yarn, or warp of low-oriented polyester yarn with an elongation of 80% or more, cotton yarn I/S, weft made of iron yarn or polyester yarn. The elastic canvas (6) with rubber woven from □ is laminated and attached, and one wedge-type V-belt is connected to fc%l. By laminating and pasting the rubberized canvas (6), the canvas with a low coefficient of friction makes it easy to slip, making it easy to pull out the belt from the pulley, and advantageously reducing the noise generated when the belt is driven.

The present invention is a 6-belt belt for power transmission with bottom construction force as described above, in which a plurality of V-belt bodies are made of polyester yarn with a low orientation yarn having an elongation of 80% or more for the warp yarn, cotton yarn for the weft yarn, A canvas fabric with few wavy intersections woven using nylon threads and polyester threads is arranged and connected at 90 degrees to the belt direction by means of tie bands embedded in rubber, making it possible to connect the canvas fabric to the belt at 90 degrees to the belt direction. Compared to power transmission belts connected with tie bands, it has extremely good elasticity in the vertical direction, and can prevent accidents such as vibration, overturning, and separation that conventionally occur, as well as significantly extending belt life. □In order to improve the strength and further increase the transmission force, the weft yarn (5b) is made of cotton yarn, nylon yarn or polyester yarn with high rigidity. In particular, the belt width may change due to the influence of heat or water, which may result in a poor fit between the belt and the pulley. The number of expressions for changing the width in the direction can be reduced.

Thus, the power transmission belt of the present invention greatly improves the performance of the conventional multi-strand belt, eliminates any loss in power transmission, and significantly increases its practicality.

[Brief explanation of the drawing]

Figures 1 and 2'' are partially cut-away perspective views showing each side of the belt of the present invention, and Figure 3 is a stretchable material used for the tie band of the power transmission belt of the present invention and the bottom surface of the low edge type V belt. A schematic plan view of the canvas, and Fig. 4 is an organization diagram of the same canvas.

Claims (1)

[Scope of Claims] l A plurality of V-belts that are laterally separated from each other and whose entire surface is covered with rubberized bias canvas, or where only the bottom surface is covered with rubberized canvas and the side surfaces are exposed. In a power transmission belt that is simultaneously driven by one pulley, 2. The upper surface of the plurality of V-belt bodies is coated with an elastic yarn consisting of a low-oriented polyester yarn with an elongation of 80% or more, and a cotton yarn, a nylon yarn, or It is characterized in that it is a canvas fabric with multiple layers of rubber made of plain weave or twill weave with non-stretchable yarns made of polyester yarns, etc., and the stretchable yarns are arranged in the longitudinal direction of the belt and connected and integrated. Power transmission belt. 2. The power transmission belt according to claim 1, wherein the rubberized canvas on the bottom surface of the V-belt is a bias canvas made of cotton yarn in both warp and weft, or a stretchable canvas according to claim 1.