JP2007056943A - Flat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat belt having a groove for positioning a tensile core wire for reinforcement, which can obtain excellent performance in using under such an environment as a blow noise owing to contact with a rotary driver for the groove is reduced, especially calmness is required. <P>SOLUTION: In the flat belt 10, a plurality of the tensile core wires 12 are embedded in a belt main body 11 which runs and rotates by being wounld between rotary drivers such as pulleys for the whole belt length, and the groove is formed in the belt surface at side contacting the rotary driver in the belt width direction so that the tensile core wires 12 is positioned in a predetermined position in the belt main body 11, and the groove is arranged at a suitable pitch on the whole belt length. In the flat belt 10, the groove is formed as a straight-like diagonal groove 13 having a predetermined inclination angle with respect to the rotary shaft line or bus line 27 of the rotary drive, and an end surface at side having at least a pulley flange is made an inclined surface 7 be narrower as approaching the pulley side in the belt width direction of all the grooves. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flat belt effective for noise suppression during driving.

  In general, in flat belts used for power transmission and physical distribution conveyors, multiple tensile core wires made of steel wire, aramid fiber, glass fiber, etc. are arranged in the belt width direction to reinforce the tension in the belt longitudinal direction. I am buried. When flat belts are manufactured by extrusion molding, cast molding or press molding (vulcanization molding), the tensile core wires should be aligned at all predetermined positions so that the belt body is not particularly unevenly arranged in the thickness direction. Attention is paid to this, and as a standard for arranging the tensile core wire at the time of molding, generally equidistant grooves are provided in the longitudinal direction of the belt. FIG. 12 shows a plan view of a conventional flat belt provided with such grooves as viewed from the inside. That is, in the case of a specification in which the flat belt 51 is wound around a rotary drive body such as a pulley (not shown), a tensile core wire extending in the longitudinal direction in the belt main body 52 is embedded and integrated. A right-angle groove 54 is formed in the belt width B direction perpendicular to the belt longitudinal direction on the inner surface on the side where the main body 52 comes into contact with the pulley, from the viewpoint of ease of making the mold car. Generally, it is provided at equal intervals over the entire length in the belt longitudinal direction. By the way, in the case of the flat belt 51 of this conventional example, the right angle groove 54 is formed in the belt width B direction of 90 degrees perpendicular to the longitudinal direction of the belt body 51. There is a phenomenon in which the edge 54a abuts and a striking sound due to the impact is intermittently generated. This hitting sound becomes a noise level that cannot be ignored especially during high-speed rotation driving, and there is a disadvantage that its use in an environment where quietness is desired is restricted.

In order to eliminate such a problem of noise generation, in Patent Document 1, in place of the conventional groove in the perpendicular direction as described above, oblique grooves having a required inclination angle α with respect to the pulley rotation axis or bus are equally spaced. We propose a flat belt engraved over the entire length of the belt and put it into practical use. As a result, it has been confirmed that a flat belt provided with an oblique groove having an inclination angle α is more effective in reducing noise due to striking with the pulley than a conventional flat belt provided with a groove in a perpendicular direction.
Japanese Patent No. 2853730

However, the linear slant groove having the inclination angle α cannot disperse the striking sound, and a belt with a smaller striking sound has been demanded.

  An object of the present invention is to provide a flat belt that can obtain satisfactory performance for use in an environment where quietness is particularly required.

  According to the first aspect of the present invention, a plurality of tensile cords are embedded in the belt main body that is wound and rotated between rotation driving bodies such as pulleys over the entire length of the belt. In order to position the belt in a predetermined position in the belt body, a groove is formed in the belt width direction on the belt surface on the side that contacts the rotary drive body, and the groove is arranged at an appropriate pitch over the entire belt length. The groove is formed as a linear oblique groove having a required inclination angle with respect to the rotational axis or bus of the rotary drive body, and at least the end face on the pulley flange side in the belt width direction of all the grooves is on the pulley side. The flat belt has an inclined surface so that the width becomes narrower.

  The invention according to claim 2 is the flat belt according to claim 1, wherein the oblique grooves are lightning bolt shaped or symmetrical with respect to the center line in the belt width direction.

  The invention according to claim 3 is the flat belt according to claim 1 or 2, wherein a convex meandering prevention guide is provided in the belt longitudinal direction on the inner surface of the belt main body on the side in contact with the rotary drive body.

  In the flat belt of the present invention, a plurality of tensile cords are embedded in the belt main body that is wound and rotated between rotating drive bodies such as pulleys over the entire length of the belt. A flat belt in which grooves are formed in the belt width direction on the belt surface on the side in contact with the rotary drive body, and the grooves are arranged at an appropriate pitch over the entire length of the belt in order to be positioned at a predetermined position in the main body. The groove is formed as a linear oblique groove having a required inclination angle with respect to the rotation axis or bus of the rotary drive body, and at least the end face on the pulley flange side in the belt width direction of all the grooves is on the pulley side. Since the flat belt has an inclined surface so as to become narrower in accordance with the conventional method, the intermittent irregularities of the cuts by the oblique grooves reaching the both end faces of the belt with the groove length extending over the entire width of the belt width as in the past. Even if there is a belt end face Since it is an inclined surface and the concave and convex portions do not contact the flange, the upper edge of the diagonal groove, in particular, cannot interfere with the flanges at both ends of the rotary drive body such as a pulley. There is almost no impact noise due to contact with a guide rail or the like, and satisfactory performance can be obtained in an environment where quietness is required.

  According to the invention described in claim 2, since the oblique groove is a flat belt according to claim 1, which has a lightning bolt shape or a symmetrical shape with respect to the center line in the belt width direction, the oblique groove is rotated by a rotary drive body. Compared to a conventional structure in which an axis or bus contacts with a predetermined inclination angle and contacts with a line as in the prior art, generation of contact hitting noise between the rotary drive and the oblique groove is minimized or In addition to being able to be suppressed, it is possible to disperse the hitting sound, and the hitting sound that is generated is almost none, and even if it occurs, it is negligible.

  According to the third aspect of the present invention, since the convex meandering prevention guide is provided in the belt longitudinal direction on the inner surface of the belt main body on the side in contact with the rotary driving body, the belt is provided. Can run more quietly without meandering.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of a configuration in which the flat belt 10 of the first embodiment is driven to rotate by being wound between a pair of pulleys 20 and 20 on the driving side and the driven side, for example, and FIG. 2 is a second embodiment. FIG. 5 is a perspective view of a form in which the flat belt 14 is driven to rotate by being wound between a pair of pulleys 20 and 20 on the driving side and the driven side. FIG. 3 is a perspective view of a configuration in which the flat belt 14 according to the third embodiment is wound around a pair of pulleys 20 and 20 on the driving side and the driven side to be rotationally driven. 4 is a side view of FIGS. 1 to 3, and FIGS. 5 to 7 are plan views of the flat belts 10 and 14 as viewed from the inner surface on the contact side with the pulley 20. The belt body 11 can be extruded, cast or press-molded (vulcanized) from a rubber-like elastic body such as urethane rubber, nitrile rubber, chloroprene rubber, etc. as shown in the conventional examples. Further, in the belt main body 11, a plurality of tensile core wires 12 made of steel wire, aramid fiber, glass fiber, or the like are embedded side by side in the belt width direction as a reinforcing material against tension acting in the belt longitudinal direction during rotation driving. ing.

  Further, grooves are provided at an appropriate pitch over the entire length in the longitudinal direction of the belt on the inner surface of the belt body 11 on the side in contact with the pulley 20, and the grooves are inclined with respect to the rotation axis or bus of the rotary drive body. Linear oblique grooves 13 having an angle are generally provided at equal intervals. The oblique groove 13 is cut to the full width from one end side of the belt width B to the other end side.

  The belt end surface 6 at least in the groove portion on the side where the pulley flange 23 is located is an inclined surface 7 such that the belt width becomes narrower in accordance with the groove 13 side.

  Further, the oblique groove may be a lightning-shaped oblique groove 15 or an oblique groove 17 that is symmetrical with respect to the center line in the belt width direction. The belt end surface 6 on the side where the pulley flange 23 is located at least of these belts also has an inclined surface 7 such that the belt width becomes narrower along the side where the groove 13 is present.

  In the flat belt 10 according to the present embodiment, the inner side of the belt main body 11 contacts the peripheral surface 21 of the pulley 20 during traveling rotation, and rotates due to frictional force. At this time, since the slant groove 13 on the contact side belt surface has an inclination angle α, it crosses the bus bar 22 of the peripheral surface 21 of the pulley 20 and comes into contact with a contact point substantially close to a point. Therefore, even if the upper edge portions 13a, 13a of the oblique groove 13 abut on the peripheral surface 21 of the pulley 20, the generated striking sound is almost none and is negligible even if it occurs.

In addition, on the inner belt surface of the belt main body 11 on the side in contact with the pulley 20, linear oblique grooves 13 are provided at equal intervals over the entire length of the belt according to a general example in this case. The oblique groove 13 is cut obliquely from one end side to the other end side of the belt width B, and is inclined at an angle α with respect to the rotation axis CC of the pulley 20 or the generatrix 27 of the cylindrical surface. The inclination angle α is about 10 ° or more and less than 90 °, and preferably about 40 ° to 70 °.

Further, at least the end face on the side where the pulley flange is provided in the belt width direction is an inclined surface 7 such that the belt width becomes narrower along the side where the groove is provided. 9 and 10 shown as a conventional example, both ends 5 of the flat belt 10 shown in FIG. 9 and FIG. Are in contact with each other on the opposite side, that is, on the back side of the belt, the pulley flange 23 and the recesses and projections of the groove are not in contact with each other, and no sound is generated.

In the flat belt 10 according to the present embodiment, the inner side of the belt main body 11 contacts the peripheral surface 21 of the pulley 20 during traveling rotation, and rotates due to frictional force. At this time, since the slant groove 13 on the contact side belt surface has an inclination angle α, it crosses the bus bar 22 of the peripheral surface 21 of the pulley 20 and comes into contact with a contact point substantially close to a point. Therefore, even if the upper edge portions 13a, 13a of the oblique groove 13 abut on the peripheral surface 21 of the pulley 20, the generated striking sound is almost none and is negligible even if it occurs.

Further, the above effect is further enhanced by the fact that the belt end surface of the oblique groove is cut by the thickness of the belt including the groove at the groove position, and the belt end surface is formed to be recessed at the groove position. As shown in FIG. 8B, which is a cross-sectional view from the arrow X ₁ -X ₁ in FIG. 8A, the pulley flange 23 and the groove end surface portion 34 do not contact each other. This eliminates the concern that noise is generated due to contact with the flange 23 at the point 35 with the flat belt 1 of the conventional example shown in FIGS. 9 and 10.

Next, the performance of the flat belt 10 according to this embodiment will be considered. Now, the flat belt 10 of this example is sample A, the flat belt 1 of the conventional example shown in FIG. 9 is sample B, and the conventional flat belt (not shown) provided with the aforementioned right-angle grooves is sample C. The sound pressure levels of noise are measured and compared for these three types of samples A, B, and C.

FIG. 11 is a graph showing the comparison results. Three types of samples A, B, and C are wound between the driving and driven pulleys 20, and the sound level meter is placed at a distance of, for example, 50 mm from the position where each of the samples A, B, and C starts to contact the driven pulley 20. Install and measure the sound pressure level of the noise generated by each sample A, B, C. In this measurement, the inclination angle α of the oblique grooves 13 and 14 provided in the sample A according to the present embodiment and the conventional sample B is set to 50 °, and the conventional sample C having no inclination angle α is used. The right-angled groove provided is 90 ° at a right angle. Furthermore, the dimensional specifications of the samples A, B, and C are common, the belt thickness dimension t is 5 mm, the belt width B dimension is 25 mm, the groove width b is 1.5 mm, the groove depth h is 1.5 mm, and The groove pitch P is 20 mm. As a driving condition, the belt tension F is set to 30 to 40 kgf when the rotational speed N of the driving pulley 20 is 1500 rpm.

Therefore, in this measurement, in order to clarify the difference in performance, each sample A, B, C is wound and mounted on a measuring machine that intentionally deviates the pulley alignment, and belts are attached to both end flanges 23 of the pulley 20. A running test was conducted so that both end surfaces interfered, and noise was measured.

  As is apparent from the graph of FIG. 15, when the obtained results (sound pressure level of generated noise) are compared, the sound pressure levels of the samples E and F of the embodiment according to the present invention are the total belt length of the conventional example. The sound pressure level of the sample D having the straight diagonal grooves 35 can be lowered by 7 to 8 dB. Further, when compared with the sample C of the conventional example using the right-angle groove, the samples E and F of the present embodiment can be reduced by about 15 to 20 dB in sound pressure level.

It is a perspective view which shows the form which wraps and uses the flat belt of 1st Example by this invention around rotary drive bodies, such as a pulley. It is a perspective view which shows the form which wraps and uses the flat belt of 2nd Example by this invention around rotary drive bodies, such as a pulley. It is a perspective view which shows the form which wraps and uses the flat belt of 3rd Example by this invention around rotary drive bodies, such as a pulley. FIG. 4 is a side view of FIGS. 1 to 3. It is the top view seen from the inside of the flat belt of 1st Example. It is the top view seen from the inner side of the flat belt of 2nd Example. It is the top view seen from the inner side of the flat belt of 3rd Example. They are a top view (a) which shows the flat belt of 1st Example by this invention by engagement with a pulley, and sectional drawing (b) by the cross section from arrow X1-X1. It is a perspective view which shows the state which wound the flat belt of the prior art example around the pulley. The top view (a) which shows the flat belt of the prior art example with a pulley, and sectional drawing (b) by the cross section from arrow X2-X2. It is a graph which shows the result obtained by measuring the noise by a sound pressure level when the flat belt of Example 1 is set to sample A and the two types of the conventional example are set to samples B and C. It is the top view seen from the inside of the flat belt which has a right angle groove | channel of a prior art example.

Explanation of symbols

5 End face 6 Belt end face 7 Inclined surface 10 Flat belt 11 Belt body 12 Tensile core wire 13 Diagonal groove 14 Flat belt 15 Lightning-shaped oblique groove 16 Meandering prevention guide 17 Symmetrically shaped oblique groove 20 Pulley 25 of rotational drive body Cylinder Surface 27 Busbar 29 of cylindrical surface Upper edge 31 Upper edge 34 Groove end surface

Claims (3)

  A plurality of tensile cords are embedded in the belt main body that is wound and rotated between rotation driving bodies such as pulleys over the entire length of the belt, and these tensile cords are positioned at predetermined positions in the belt main body. In order to achieve this, a flat belt is formed in which a groove is formed in the belt width direction on the belt surface in contact with the rotational driving body, and the groove is disposed at an appropriate pitch over the entire length of the belt. It is formed as a linear slanted groove having a required inclination angle with respect to the rotation axis or the bus line, and at least the end face on the pulley flange side in the belt width direction of all the grooves becomes narrower toward the pulley side. A flat belt characterized by an inclined surface.   2. The flat belt according to claim 1, wherein the oblique groove has a lightning bolt shape or a symmetrical shape with respect to a center line in the belt width direction. 3. The flat belt according to claim 1, wherein a convex meandering prevention guide is provided in the longitudinal direction of the belt on the inner surface of the belt main body on the side in contact with the rotary drive.

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