JPH06129493A - High load transmission v ribbed belt and manufacture thereof - Google Patents

Abstract

PURPOSE:To heighten a lateral pressure proprty as well as to make a rib be hard to be deformed and rib flying hard occur too. CONSTITUTION:A short fiber 9 is curvedly mixed in a rib 3 projecting out of a belt base line. In addition, this short fiber 9 is oriented in a direction almost orthogonal with a rib side face 3a. When it is engaged with a pulley 11, the short fiber 9 to be situated in the vicinity of the rib side face 3a comes to be a direction almost orthogonal with a rib groove face 12a of a rib groove 12, whereby the short fiber 9 props itself against the groove face 12a of the rib groove 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high load V-ribbed belt having a belt base belt and a plurality of ribs protruding from the belt base belt and formed of short fiber composite rubber, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a V-ribbed belt a is composed of an upper canvas layer b, a core layer e in which a core cord d is embedded in an adhesive rubber c, and a short fiber. It is known that f is oriented in the belt width direction and a rib rubber layer h forming a plurality of ribs g is sequentially laminated.

[0003]

However, in such a V-ribbed belt a, when the V-ribbed belt a is engaged with the rib groove of the ribbed pulley, the short fiber f of each rib g (ribbed rubber layer h) is pulled by the pulley. Since the direction is inclined with respect to the groove surface, the resistance force of each rib g against the reaction force received from the rib groove surface due to the engagement with the pulley is weak and the ribs are easily deformed. In addition, since the short fibers f are oriented in the belt width direction (horizontal direction) in the ribs g, the short fibers f advance faster than the so-called separation that occurs near the roots of the ribs g. Flying is likely to occur.

By the way, for example, Japanese Utility Model Publication 55-17374.
As described in Japanese Patent Laid-Open No. 2 (1993), a V-ribbed belt in which lateral short fiber groups are embedded in a rib in a corrugated shape is also known. However, this V-ribbed belt has short fibers in the width direction on a V-shaped rib surface. Since the group is oriented in a wavy shape parallel to the rib side surface, the resistance of each rib to the reaction force received from the rib groove surface due to the engagement with the pulley is weak and the rib is easily deformed.

The present invention has been made in view of the above points, and provides a V-ribbed belt and a method of manufacturing the V-ribbed belt in which ribs are less likely to be deformed and rib jumps are less likely to occur by increasing lateral pressure.

[0006]

According to a first aspect of the present invention, there is provided a V-ribbed belt for high load transmission comprising a belt base belt and a plurality of ribs projecting from the belt base belt and formed of short fiber composite rubber. As a premise, each of the ribs is configured such that the short fibers are oriented so as to curve in a mountain shape on the belt base band side, and the short fibers near the rib side faces are substantially orthogonal to the rib side faces.

The invention of claim 2 is based on the method of manufacturing a V-ribbed belt for high load transmission, as in claim 1, and is a cylindrical unvulcanized belt molded body mounted on a vulcanization molding die. A vulcanization belt molded body is formed by externally fitting a vulcanization molding sleeve having corrugated irregularities on the inner peripheral side to a rib rubber sheet located on the outer side of the vulcanization belt to form a vulcanization belt molding, A grindstone member having a portion is applied and ground so that the cutting edge of the blade portion of the grindstone member is aligned with the tip of the convex portion of the corrugated uneven portion of the rib rubber layer of the vulcanized belt molded body, and a belt molded body is formed. The configuration.

[0008]

According to the invention of claim 1, since the short fibers in the rib rubber are oriented in a direction substantially orthogonal to the rib side surfaces, when the short fibers are engaged with the pulley, the short fibers are aligned with the rib groove surface of the pulley. The directions are substantially orthogonal to each other, and the ribs protrude against the groove surface of the pulley, the lateral pressure is enhanced, and the ribs are less likely to be deformed.

According to the second aspect of the present invention, there is provided a vulcanized belt molded body having a corrugated uneven portion formed on the outer peripheral surface thereof. By grinding the rib shape by matching the blade tips of the blade portions of the whetstone member having, the V-ribbed belt in which the short fibers in the rib rubber are oriented in a direction substantially orthogonal to the rib side surface is obtained.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In FIG. 1, which shows a schematic structure of a high load transmission V-ribbed belt, reference numeral 1 is a high load transmission V-ribbed belt having a plurality of ribs 3 projecting from a belt base band 2.
In the belt base band 2, from the upper side, an upper canvas layer 4, a core layer 7 in which a core cord 6 is embedded spirally in an adhesive rubber 5, and a part of a rib rubber layer 8 forming a rib 3 are sequentially arranged. It is configured by stacking. In each of the ribs 3, the short fibers 9 are oriented so as to curve in a mountain shape on the belt base band 2 side, and the short fibers 9 near the rib side surface 3a are substantially orthogonal to the rib side surface 3a.

Therefore, when the V-ribbed belt 1 is engaged with the rib groove 12 of the ribbed pulley 11, the short fibers 9 mixed in the rib 3 and located near the rib side surface 3a are rib grooved, as shown in FIG. Since the direction is substantially orthogonal to the surface 12a, even if the reaction force F in the direction substantially coincident with the orientation direction of the short fibers 9 is applied, the short fibers 9 are bulged and the lateral pressure is enhanced, whereby the ribs are increased. 3 is less likely to deform, which is advantageous for heat generation.

Further, since the short fibers 9 are oriented so as to curve in a mountain shape toward the belt base band 2 at the root portion of the rib 3, the short fibers are oriented parallel to the belt width direction as in the conventional case. In comparison, the lack of ribs 3, that is, so-called rib defects, is reduced, and the durability is improved.

Next, a method for manufacturing the V-ribbed belt will be described.

First, as shown in FIG. 3, on a flat cylindrical mold 21, a canvas 22, which serves as an upper canvas, an upper adhesive rubber sheet 23, a core cord 24, a lower adhesive rubber sheet 25, and a rib rubber sheet 26 are sequentially arranged. Laminated and unvulcanized belt molding 2
Mold 7. At this time, the short fibers 28 mixed in the rib rubber sheet 26 are oriented in the sheet width direction corresponding to the belt width direction.

Then, in this state, the concave portion 29a and the convex portion 2
The vulcanization molding is performed by externally fitting the unvulcanized belt molding 27 with the vulcanization molding rubber sleeve 30 having the corrugated irregularities 29 in which 9b are alternately arranged on the inner peripheral side. During this vulcanization molding, the short fibers 28 in the rib rubber sheet 26 are pressed against the corrugated concavo-convex portion 29 of the rubber sleeve 30, and the corrugated concavo-convex portion 29 is formed.
To be curved corresponding to (see FIG. 4).

After vulcanization and molding, the vulcanized belt molded body 31 is removed from the molding die 21 and mounted on the grinding drum 32 as shown in FIG. 4 to form a plurality of blade portions 3 having a shape corresponding to the rib shape.
3 is applied to grind the rib shape to form a belt molded body 35 (see FIG. 5). At this time, the convex portion 36a and the concave portion 36b of the vulcanized belt molded body 31 are
The short fiber 28 moves to the side of the molding die 21 (belt base band 2) by grinding the tip end of the convex portion 36a of the corrugated concave-convex portion 36 consisting of and by aligning the tip end of the blade portion 33 of the grindstone member 34 with each other. The short fibers 28, which are oriented so as to be curved in a mountain shape and located near the rib side surface, are substantially orthogonal to the surface serving as the rib side surface.

After grinding by the grindstone member 34, the belt molding 35 is mounted on the cut mantle 41, and a predetermined belt is formed by the cutter 42 as shown in FIG. 5 according to the number of ribs of the V-ribbed belt required thereafter. The belt molded body 35 is cut to have a width L to obtain a desired V-ribbed belt.

Next, the tests conducted on the V-ribbed belt of the present invention shown in FIG. 1 and the conventional V-ribbed belt shown in FIG. 8 will be described.

(1) High tension endurance test As shown in FIG. 6, a driving pulley 51 (diameter 120 mm, pulley rotation number 4900 rpm), a driven pulley 52 (diameter 12)
0mm, load 12PS) and idle pulley 53, a test belt 54 (3PK1000) is wound around the idle pulley 53, and the idle pulley 53 is run for 24 hours with the load SW = 85kgf being pulled in the S1 direction. The temperature was measured.

(2) Rib chipping durability test As shown in FIG. 7, a driving pulley 61 (diameter 50 mm, pulley rotation speed 3500 rpm) and a driven pulley 62 (diameter 50 m)
m, load 6PS) and test belt 63 (3PK10
00) was wound, the drive pulley 61 was run in a state of being pulled at DW = 100 kgf in the S2 direction on the side opposite to the driven pulley 62, and the time until the rib was missing was measured.

(3) Test Results As shown in Table 1 below, the V-ribbed belt of the present invention produces less belt heat, has better durability against rib chipping, and has a longer belt life than the conventional V-ribbed belt. Recognize.

[0023]

[Table 1]

[0024]

As described above, according to the invention of claim 1, short fibers are mixed into each rib so as to curve in a mountain shape, and the short fibers are oriented in a direction substantially orthogonal to the rib side surface. When engaged with the pulley, the short fibers are in a direction substantially orthogonal to the rib groove surface, projecting against the pulley groove surface, increasing lateral pressure,
The rib is less likely to be deformed, and it is also advantageous for heat generation.

According to a second aspect of the present invention, at the tip of the corrugated convex portion of the vulcanized belt molding, the corrugated convex and concave portions are molded on the outer peripheral surface,
Since the cutting edge of the grindstone member having a blade shape corresponding to the rib shape is made to match and is ground, the short fibers in the rib rubber are oriented in a direction substantially orthogonal to the rib side surface.
The ribbed belt can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a high load transmission V-ribbed belt in section.

FIG. 2 is a cross-sectional view showing a state in which a high load transmission V-ribbed belt is engaged with a ribbed pulley.

FIG. 3 is an explanatory diagram of a method for manufacturing a V-ribbed belt for high load transmission.

FIG. 4 is an explanatory diagram of a method for manufacturing a V-ribbed belt for high load transmission.

FIG. 5 is an explanatory diagram of a method for manufacturing a V-ribbed belt for high load transmission.

FIG. 6 is an explanatory diagram of a test method for a high load transmission V-ribbed belt.

FIG. 7 is an explanatory diagram of a test method for a high load transmission V-ribbed belt.

FIG. 8 is a view similar to FIG. 1 for a conventional V-ribbed belt.

[Explanation of symbols]

 1 V ribbed belt 2 Belt base band 3 Rib 3a Rib side surface 9 Short fiber 21 Cylindrical mold (mold for vulcanization molding) 26 Rib rubber sheet 27 Unvulcanized belt molded body 30 Rubber sleeve for vulcanization molding 33 Blade portion 34 Grindstone member 35 Belt molded body 36 Wavy corrugated portion 36a Convex portion 36b Recessed portion

Claims (2)

[Claims] 1. A V-ribbed belt for high load transmission, comprising: a belt base band; and a plurality of ribs projecting from the belt base band and formed of a short fiber composite rubber. V for high load transmission, characterized in that the short fibers near the rib side face are oriented so as to curve in a mountain shape on the strip side and are substantially orthogonal to the rib side face.
Ribbed belt. 2. A method for producing a V-ribbed belt for high load transmission, comprising: a belt base belt; and a plurality of ribs projecting from the belt base belt and formed of short fiber composite rubber. A vulcanization belt is formed by externally fitting a vulcanization molding sleeve having corrugated irregularities on the inner peripheral side to a rib rubber sheet located on the outside of the mounted tubular unvulcanized belt molding and vulcanization molding. A grindstone member that forms a body and has a plurality of blade portions corresponding to the rib shape, so that the cutting edge of the blade portion of the grindstone member matches the tip of the convex portion of the corrugated uneven portion of the rib rubber layer of the vulcanized belt molded body. A method for manufacturing a V-ribbed belt for high load transmission, which comprises applying the method to and grinding to form a belt molded body.