JP2853730B2 - Flat belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat belt effective for suppressing noise during driving.

[0002]

2. Description of the Related Art In general, in a flat belt used for power transmission and distribution conveyors, a plurality of tensile core wires made of steel wire, aramid fiber or glass fiber are used to reinforce the tension in the belt longitudinal direction. They are buried side by side in the belt width direction. When flat belts are manufactured by extrusion molding, casting molding or press molding (vulcanization molding), the tensile cores must be arranged in all positions so that the arrangement in the thickness direction of the belt body is not particularly uneven. Attention has been paid to providing generally equally spaced grooves over the entire length of the belt as a reference for the arrangement of the tensile cores during molding. FIGS. 11 and 12 are a plan view and a side cross-sectional view of a conventional flat belt provided with such a groove as viewed from the inside. That is, in the case of using the flat belt 1 by winding it around a rotary drive such as a pulley (not shown), a tensile core wire 3 extending in the longitudinal direction in the belt main body 2 is embedded and integrated, On the inner surface on the side where the belt body 2 contacts the pulley, a right-angle groove 4 is formed in the direction of the belt width B orthogonal to the longitudinal direction of the belt from the viewpoint of ease of forming the molding wheel. Are generally provided at equal intervals over the entire length in the belt longitudinal direction.
By the way, in the case of the flat belt 1 of this conventional example, since the right-angle groove 4 is formed in the belt width B direction of 90 ° orthogonal to the longitudinal direction of the belt body 1, the upper edge of the right-angle groove 4 is 4a comes into contact with each other, and an impact sound is generated intermittently due to the impact. This striking noise becomes a noise that cannot be ignored especially during high-speed rotation driving, and thus has a disadvantage that use in an environment where quietness is desired is limited.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure in which a groove is intermittently provided in a belt body for disposing a tensile core wire at a predetermined position in the belt body.
It is an object of the present invention to provide a flat belt suitable for use in an environment where quietness is desired, which can reduce impact noise generated by contact with a rotary drive such as a pulley due to the groove.

[0004]

The flat belt according to the present invention is wound around a rotary driving body such as a columnar or cylindrical pulley and rotates to form a plurality of tensile core wires extending in the belt longitudinal direction on the belt body. In order to embed and integrate the tension core wire at a predetermined position in the belt main body, a number of grooves arranged in the belt longitudinal direction on the inner surface of the belt main body on the side in contact with the rotary driving body have a belt width. The groove is formed as a linear oblique groove having a predetermined inclination angle with respect to the rotation axis or the generating line of the rotary driving body.

[0005]

[Action] Since the groove is formed as a linear oblique grooves having a predetermined inclination angle to the axis of rotation or generatrix of the rotary drive member, substantially the straight oblique groove to the axis of rotation or generatrices of such pulley rotational drive member Contact can be made with a contact point close to a point, and the generation of a contact impact sound between the rotary driving body and the linear oblique groove can be reduced or suppressed to a minimum.

[0006]

Hereinafter, an embodiment of a flat belt according to the present invention will be described .
Explanation will be given based on the plane . FIGS. 1 and 2 are a perspective view and a side view of a mode in which the flat belt 10 of the first embodiment is wound around, for example, a pair of pulleys 20 on the driving side and the driven side and is driven to rotate. 4 shows a plan view and a side sectional view of the flat belt 10 alone viewed from the inner surface on the side of contact with the pulley 20. The belt body 11 can be extruded, cast or pressed (vulcanized) from a rubber-like elastic material such as urethane rubber, nitrile rubber, chloroprene rubber or the like as shown in the conventional examples. Further, in the belt main body 11, a steel wire, as a reinforcing material against tension acting in the belt longitudinal direction at the time of rotational driving,
A plurality of tensile core wires 12 made of aramid fiber or glass fiber are embedded in the belt width direction.

On the inner surface of the belt body 11 on the side in contact with the pulley 20, linear oblique grooves 13 are generally provided at equal intervals over the entire length in the longitudinal direction. The straight oblique groove 13 is cut obliquely from the one end side of the belt width B to the other end side to the entire width, and is inclined at an angle α with respect to the direction of the belt width B. In other words, the linear oblique groove 13 is inclined at an angle α with respect to the rotation axis CC of the pulley 20 as a rotating cylinder or the cylindrical body bus line 22 parallel to the rotation axis CC. The groove angle α is 9 at about 10 ° or more.
It is less than 0 °, preferably about 40-70 °.

Accordingly, in the flat belt 10 of the first embodiment, the inside of the belt body 11 comes into contact with the pulley 20 at the time of rotational driving, but the linear oblique groove 13 provided inside the belt main body 11 has the cylindrical shape of the rotating pulley 20. It only touches the bus bar 22 of the surface 21 with a contact almost close to a point. Therefore, the cylindrical surface 21 of the pulley 20 and the upper edge 13a of the linear oblique groove 13
Even if the contact 13a comes in contact, the hitting sound generated is almost negligible or slight, and does not cause a great problem even when used in an environment where quietness is desired.

Here, the flat belt 1 of the conventional example shown in FIGS. 11 and 12 is a sample A, the flat belt 10 of the first embodiment of the present invention is a sample B, the right-angle groove 4 of the conventional example, and the present embodiment. A flat belt without any groove such as the linear oblique groove 13 is referred to as a sample C. These three samples A, B, and C are wound between a pair of pulleys 20, 20 as shown in FIG. 5, and the noise meter 30 is placed at a distance of, for example, 50 mm from a position where each sample belt starts to contact the driven pulley 20. Is installed, and the sound pressure levels of the noise generated by the samples A, B, and C are measured and compared. At this time, the groove angle cutting of the right-angle groove α of the conventional sample A is 90 °, and the linear oblique groove 1 of the first embodiment sample B is 1 °.
The groove angle α of No. 3 is 60 °. In addition, each sample A, B, C
3 and 4 of the first embodiment, the belt thickness indicated by the symbol T in the figure is 5 mm and the symbol B is the same.
The belt width 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 the driving conditions, the number of revolutions per minute N of the driving side pulley 20 was set to 1500 rpm and 5000 rpm.
And the belt tension F is set to 30 to 40 kgf.

[0010] Result obtained (sound pressure level of generated noise)
Is shown in the following table and the graphs of FIGS.

From these results, it is clear that the sound pressure level of the sample B of the first embodiment according to the present invention is lower than the sound pressure level of the sample A of the conventional example by 8 dB to 13 dB.
Further, even when compared with the sample C having no groove, even in the case of the sample B of the first embodiment, even if the linear oblique groove 13 is provided, there is almost no difference in the sound pressure level.

That is, as shown in FIG. 1, during rotation, in the case of the flat belt 10 of the first embodiment, the upper edges 13a, 13a of the linear oblique grooves 13 and the cylindrical bus bar 22 of the pulley 20 Contact at a contact point X which is almost close to a point, and the contact point X is continuously contacted, so that the impact sound due to the collision is reduced. On the other hand, in the case of the flat belt 1 of the conventional sample A, the right-angle groove 4 intermittently contacts the upper edges 4a, 4a and the cylindrical bus bar 22 of the pulley 20 one after another, thereby causing a collision. The impact sound increases. In addition, right angle groove 4
Or, in the case of a flat belt having a groove provided for the above-described reason, such as the linear diagonal groove 13, even if the linear diagonal groove 13 is provided at a required angle as in the present invention, there is no groove. This means that noise generation can be suppressed to a sound pressure level that is not much different from a flat belt.

On the other hand, FIG. 8 shows a second embodiment of the present invention. In this case, the belt main body 11 is provided with two straight oblique grooves 14 and 15 intersecting with each other. The same effects as in the first embodiment can be obtained. FIG.
10 shows a third embodiment, in which the belt body 11 has the same inclination angle α as that of the first embodiment.
In addition, in order to prevent the belt from meandering during driving, a two-sided meandering prevention guide 16 extending on the entire length in the longitudinal direction of the belt body 11 is provided in a convex shape. is there.

[0014]

The flat belt according to the present invention is provided with a tensile core buried in a belt body, and is formed on a surface in contact with a rotary driving body such as a pulley in order to form the tensile core in a predetermined position. The grooves are provided at equal intervals in the longitudinal direction of the belt, and the grooves are formed as straight oblique grooves at a predetermined inclination angle with respect to the rotation axis or the generating line of the rotary driving body. Minimizes the generation of contact impact noise between the rotary drive and the diagonal groove compared to the conventional structure in which the rotary drive or rotary bus contacts the rotary axis or bus at a point close to a point and contacts with a line as before. In particular, the present invention has an effect that it is suitable in an environment where quietness is desired and the versatility is widened .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment in which a flat belt according to a first embodiment of the present invention is used by being wound around a rotary drive such as a pulley.

FIG. 2 is a side view of FIG. 1 of the flat belt according to the first embodiment as viewed from the side.

FIG. 3 is a plan view of the flat belt according to the first embodiment as viewed from the inside.

FIG. 4 is a side sectional view of the flat belt according to the first embodiment.

FIG. 5 is a schematic view of an apparatus for measuring and comparing the sound pressure levels of the flat belts of the first embodiment and the conventional example.

FIG. 6 is a performance graph of measurement results showing a correlation between a belt tension and a sound pressure level at a pulley rotation speed of 1500 rpm.

FIG. 7 is a performance graph of measurement results showing a correlation between a belt tension and a sound pressure level at a pulley rotation speed of 5000 rpm.

FIG. 8 is a plan view seen from the inside of a flat belt according to a second embodiment.

FIG. 9 is a plan view of the flat belt according to the third embodiment as viewed from the inside.

FIG. 10 is a side sectional view of a flat belt according to a third embodiment.

FIG. 11 is a plan view of a conventional flat belt viewed from the inside.

FIG. 12 is a side sectional view of a conventional flat belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flat belt 11 Belt main body 12 Tensile core wire 13 Straight diagonal groove 13a Upper edge of linear diagonal groove 20 Pulley of rotary driving body

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16G 1/00-1/28 B65G 15/42 B29D 29/00-29/08

Claims (3)

(57) [Claims] 1. A belt-shaped or cylindrical pulley or the like which is wound around a rotary driving body and rotates to embed and integrate a plurality of tension cores extending in a belt longitudinal direction into a belt main body, and integrate the tension cores. A flat belt in which a number of grooves arranged in the belt longitudinal direction are formed in the belt longitudinal direction on the inner surface of the belt body on the side that comes into contact with the rotary driving member in order to bury the belt in a predetermined position in the belt body, A flat belt, wherein the grooves are formed as linear oblique grooves having a predetermined inclination angle with respect to a rotation axis or a generating line of a rotary driving body. 2. The flat belt according to claim 1, wherein the flat belt is formed as two straight oblique grooves in which the grooves intersect. 3. The flat belt according to claim 1, wherein a convex meandering prevention guide is provided on an inner surface of the belt main body on a side that comes into contact with the rotary driving body in a belt longitudinal direction.