JP2007051755A - Flat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat belt obtaining satisfactory performance in use in environment where particularly silence is demanded by reducing impact noise caused by grooves abutting on a rotating drive body, in the flat belt provided with the grooves for positioning reinforcing tension core wires. <P>SOLUTION: The groove of the flat belt 10 is formed as an oblique groove having a predetermined tilt angle to the rotation axis or a generating line of the rotating drive body, and the oblique groove has a lightning shape or a symmetrical shape with respect to the width direction center of the belt. <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. 9 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 core wires extending in the longitudinal direction of the belt are embedded and integrated in the belt main body and rotated around a rotary drive body such as a columnar or cylindrical pulley. In order to embed the tensile core wire at a predetermined position in the belt body, a plurality of grooves arranged in the belt longitudinal direction are formed in the belt width direction on the inner surface of the belt body on the side in contact with the rotary drive body. In the belt, the groove is formed as a linear oblique groove having a predetermined inclination angle with respect to the rotation axis or bus of the rotary drive body, and the oblique groove has a lightning bolt shape or a symmetrical shape with respect to the center line in the belt width direction. A flat belt.

  The invention according to claim 2 is 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 body.

  In the flat belt of the present invention, a plurality of tensile core wires extending in the longitudinal direction of the belt are embedded and integrated in the belt main body and rotated around a rotary drive body such as a columnar or cylindrical pulley. In a flat belt in which a number of grooves arranged in the longitudinal direction of the belt are formed in the belt width direction on the inner surface of the belt body on the side in contact with the rotational drive body in order to embed the tension core wire at a predetermined position in the belt body. The groove is formed as a linear oblique groove having a predetermined inclination angle with respect to the rotational axis or bus of the rotary drive body, and the oblique groove is a lightning bolt shape or a flat shape that is symmetrical with respect to the center line in the belt width direction. Since the belt is a belt, the slant groove is in contact with the rotation axis or bus of the rotation drive body at a predetermined inclination angle, and compared with the conventional structure in which contact is made with a line, the rotation drive body and the slant groove are The occurrence of contact impact noise in addition to being able to reduce or suppress to a minimum, it is possible to disperse the impact sound, impact sound generated becomes insignificant in negligible none close, even if it occurs.

  According to the second aspect of the present invention, since the 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 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 side view of FIGS. 1 and 2, and FIGS. 4 and 5 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, on the inner surface of the belt main body 11 on the side in contact with the pulley 20, lightning-shaped oblique grooves 13 or oblique grooves 15 that are symmetrical with respect to the center line in the belt width direction are generally equidistant over the entire length in the belt longitudinal direction. Is provided. The lightning-shaped oblique groove 13 or the symmetrical oblique groove 15 is cut to the full width from one end side of the belt width B to the other end side.

  More preferably, as in the fifth and sixth embodiments shown in FIG. 6 or FIG. 8, the lightning-shaped oblique grooves 13 or the symmetrical oblique grooves 15 fill the entire width of the belt width B at both ends of the belt. It is preferable that the groove length is set so as not to reach the surface. By doing so, both end faces 17 and 19 of the belt main body 11 are smooth, and the unevenness due to the incision is greater than when the lightning-shaped oblique grooves 13 or the symmetrical oblique grooves 15 are formed to the full width of the belt. Disappear. This means that both end faces 17 and 19 of the belt can always contact the both end flanges 23 of the pulley 20 with smooth surfaces, and the contact between the both ends of the slant groove and the pulley flange side is eliminated.

  In the flat belt 10 of the first embodiment, the inner side of the belt main body 11 is in contact with the pulley 20 at the time of rotational driving, but is symmetrical with respect to the lightning-shaped oblique groove 13 provided on the inner side or the center line in the belt width direction. A certain slanted groove 15 only comes into contact with a contact point substantially close to the bus bar 27 of the cylindrical surface 25 of the rotating pulley 20. Therefore, even if the cylindrical surface 25 of the pulley 20 and the upper edges 29 and 31 of the lightning-shaped oblique groove 13 or the symmetrical oblique groove 15 abut, the generated striking sound can be reduced. Furthermore, since the slanted grooves are lightning bolt shaped or symmetrical with respect to the center line in the belt width direction, it is possible to disperse the striking sound, and there is almost no striking sound, and it is negligible even if it occurs. It becomes.

  Here, the flat belt 10 of the first embodiment of the present invention shown in FIGS. 1 and 3 is the sample A, the flat belt 14 of the second embodiment is the sample B, and the right angle groove of the conventional example shown in FIG. The flat belt 33 having 4 is designated as sample C, and the flat belt having the groove angle α60 ° of the linear oblique groove 35 of the first comparative example shown in FIG. Further, each sample A, B, C, and D is wound between a pair of pulleys 20 and 20 as shown in FIG. 10, and noise is caused, for example, at a distance of 50 mm from a position where each sample belt starts to contact with the pulley 20 on the driven side. A total 30 is installed to measure and compare the sound pressure level of the noise generated by each sample A, B, C, D. At this time, the groove angle of the right-angled groove α of the conventional sample C is 90 °, and the groove angle α of the linear oblique groove 18 of the first comparative sample D is 60 °. In addition, the dimensional specifications of the samples A, B, C, and D are the same. If FIGS. 4 and 11 of the first embodiment are used, the belt thickness indicated by the symbol T in the drawing is 5 mm, and the belt width indicated by the symbol B. 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. Further, as a driving condition, the belt tension F is set to 300 to 400 N when the rotational speed N of the driving pulley 20 is 1500 rpm and 5000 rpm.

  The obtained results are shown in the following Table 1 and the graphs of FIGS.

  From these results, it is clear that the sound pressure level of the sample A of the first embodiment according to the present invention is 8 dB to 16 dB lower than the sound pressure level of the sample C of the conventional example. Also, compared with D, which is a conventional example having a linear oblique groove, the sample A of the first example and the sample B of the second example are 2 dB lower at the maximum.

That is, as shown in FIG. 1, during the rotation drive, in the case of the flat belt of FIG. 1, the upper edges 29 and 31 of the lightning-shaped oblique groove 13 and the cylindrical surface bus 27 of the pulley 20 are dotted. When the contact point X is substantially close to the contact point X, and the contact point X is continuously in contact with the contact point X, it is possible to reduce the impact sound caused by the collision. Furthermore, by using a lightning bolt shape, the hitting sound can be dispersed.
On the other hand, in the case of the flat belt 33 of the conventional sample C, the right-angle groove 54 intermittently comes into contact with the upper edges 54a and 54a and the cylindrical surface bus 27 of the pulley 20 one after another. The hitting sound due to increases.

  On the other hand, FIG. 2 shows a second embodiment of the present invention. In this case, oblique grooves that are symmetrical with respect to the center line in the width direction of the belt body 11 are generally provided at equal intervals. This also provides the same effect as the first embodiment. FIGS. 16 and 17 show the third and fourth embodiments. In this third embodiment, the belt body 11 is provided with the same lightning-shaped oblique grooves 13 as in the first embodiment, and in addition to this, In order to prevent the meandering of the belt during driving, two meandering prevention guides 16 extending on the entire length in the longitudinal direction of the belt main body 11 are provided in a convex shape.

  In addition, the flat belt of the embodiment in which the lightning-shaped oblique groove 13 which is a modified example of this example is set to a groove length that does not reach the both end faces of the belt to the full width of the belt is designated as E, and similarly to the entire belt width. The flat belt of the example having the symmetrical slanted groove 13 that does not reach is F. Further, as a second comparative example, G is a flat belt that is a linear oblique groove and does not reach the entire belt width. These seven types of samples A, B, C, D, E, F, and G are measured and compared for the sound pressure level of noise.

FIG. 15 is a graph showing the comparison results. Seven types of samples A, B, C, D, E, F, and G are wound between the driving side and the driven pulley 20, and the samples A, B, C, D, E, and F are driven by the driven pulley 20. , G is installed at a distance of, for example, 50 mm from the position where G starts to contact, and the sound pressure level of noise generated by each sample A, B, C, D, E, F, G is measured. The dimensions of the samples A, B, C, D, E, F, and G are common, the belt thickness t is 5 mm, the belt width B is 25 mm, the groove width b is 1.5 mm, and 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, D, E, F, G is wound and mounted on a measuring machine that intentionally deviates the pulley alignment. A running test was conducted so that both end portions of the belt interfered with the flanges 23 at both ends, 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. FIG. 3 is a side view of FIGS. 1 and 2. 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 a perspective view which shows the form which wraps and uses the flat belt of 5th 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 6th Example by this invention around rotary drive bodies, such as a pulley. It is the top view (a) which shows the flat belt of 5th Example by this invention by engagement with a pulley, and sectional drawing (b) by the cross section from arrow X1-X1. 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. It is the top view seen from the inside of the flat belt which has a linear slanting groove | channel of a prior art example. It is the schematic of the apparatus which measures and compares the sound pressure level of each flat belt of an Example and a prior art example. It is a side view of 1st Example. It is a performance graph of a measurement result which shows correlation with belt tension and sound pressure level in pulley rotation number 1500rpm. It is a performance graph of a measurement result which shows correlation with belt tension and sound pressure level in pulley rotation speed 5000rpm. The flat belts of the embodiment according to the present invention are samples A, B, E, and F, the conventional flat belt is sample C, the flat belt of the first comparative example is sample D, and the flat belt of the second comparative example is sample G. It is a graph which shows the result obtained by measuring the noise by a sound pressure level in the case of being. It is the top view seen from the inner side of the flat belt of 3rd Example. It is the top view seen from the inner side of the flat belt of 4th Example. It is side surface sectional drawing of the flat belt of 3rd Example and 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flat belt 11 Belt main body 12 Tensile core wire 13 Lightning-shaped diagonal groove 14 Flat belt 15 Symmetrical diagonal groove 16 Meander prevention guide 20 Pulley 25 of a rotational drive body Cylindrical surface 27 Busbar 29 of a cylindrical surface Upper edge 31 Upper edge 35 Compression rubber sheet

Claims (2)

The belt is rotated by being wound around a rotary drive body such as a columnar or cylindrical pulley, and a plurality of tensile core wires extending in the belt longitudinal direction are embedded in the belt main body and integrated. In a flat belt in which a large number of grooves arranged in the belt longitudinal direction are formed 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 order to be embedded in a predetermined position,
The groove is formed as an oblique groove having a predetermined inclination angle with respect to the rotation axis or bus line of the rotary driving body, and the oblique groove is lightning bolt shaped or symmetrical with respect to the belt width direction center line. Flat belt. 2. 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 driving body.

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