JPH07293641A - Ribbed belt - Google Patents

Abstract

PURPOSE:To prevent any sound due to adhesion under over-tension at initial running phase and also prevent any belt slip sound due to sudden load applied in decrease of tension which follows the running by improving rubber compound a compressed rubber layer for forming 'V' ribs. CONSTITUTION:In a V ribbed belt 1 having a compresssed rubber layer 6 with plural V ribs 7 arranged side by side and extended in the longitudinal direction of the belt below an anti-tension layer 4 with anti-tention bodies 2 embedded in an adhesive rubber layer 3, the compressed rubber layer 6 is made of a rubber compound in which 0.75-1.50 pts.wt. of wax 9 of melting point 40-80 deg.C is mixed in 100 pts.wt of rubber including chloroprene polymer as the main constitutent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-ribbed belt,
Specifically, the present invention relates to a V-ribbed belt used for general industry, automobiles, agricultural machinery, and home appliances.

[0002]

2. Description of the Related Art V-ribbed belts, which are a type of power transmission belts, are thinner than V-belts and therefore have less bending stress, have a wide usable range for small pulleys, and can be designed compactly, and also have an energy-saving effect. It is remarkable. Further, compared to the V belt, the V-ribbed belt has many advantages such as a decrease in the belt tension caused by the depression in the pulley groove at the time of driving, and thus a long belt life. It is expanding steadily for automobiles, agricultural machinery and home appliances.

By the way, in this type of V-ribbed belt, a plurality of V-shaped ribs extending in the longitudinal direction of the belt are integrally formed inside a flat belt-shaped tension body layer in which a tension rope is embedded in an adhesive rubber layer. Molded, the tensile body layer is a rubber-coated canvas with one or more layers attached to the back surface,
Alternatively, a structure in which a rubber layer is simply attached to the back surface is known.

In this V-ribbed belt, a group of short fibers is embedded in a V-shaped rib while maintaining the orientation in the width direction of the belt to enhance the lateral pressure resistance of the friction transmission portion of the belt, and a part of the embedded short fibers. Is intended to improve wear resistance by positively exposing the belt to both side wall surfaces of the rib transmission portion, and these belts are widely known.

Further, by intentionally projecting a part of the embedded short fibers from both side wall surfaces of the V-shaped rib portion, for power transmission aiming at enhancing the friction performance of the friction transmission portion of the belt and the effect of suppressing sticky sound. Belts have been proposed.
Further, by using aramid fiber as a short fiber for projecting a part thereof from the friction transmission part of the belt with the intention of further advancing the belt having the above-mentioned structure, due to abrasion resistance peculiar to aramid fiber, the belt itself A power transmission belt intended to improve durability is disclosed in, for example, Japanese Patent Laid-Open No. 1-
It is disclosed in Japanese Patent No. 164839.

[0006]

However, the V-ribbed belt having the above-mentioned structure requires special conditions when the belt is ground to form a V-ribbed shape, and is short fiber as compared with other fibers. Has the advantage of protruding relatively easily,
On the other hand, the aramid fiber has a problem such as an increase in cost. The present invention has arrived at the result of various investigations in order to solve this problem in view of the actual situation as described above. In addition, it is intended to prevent the belt slip noise when a sudden load is applied in a state where the tension is lowered.

[0007]

In order to achieve the above-mentioned object, a feature of the present invention is that the adhesive rubber layer extends in the longitudinal direction of the belt on the lower surface of the tensile body layer in which the tensile body is embedded. In a V-ribbed belt having a compressed rubber layer in which a plurality of V-shaped ribs are arranged in parallel, the compressed rubber layer contains 0.75 to 1 parts by weight of wax having a melting point of 40 to 80 ° C. with respect to 100 parts by weight of rubber mainly composed of chloroprene polymer. It is a V-ribbed belt which is a rubber compound mixed with 50 parts by weight.

[0008]

When a predetermined amount of wax is mixed and mixed in the compressed rubber layer of the V-ribbed belt, the wax in the V-shaped rib blooms with the lapse of time to reduce the coefficient of friction. Prevents noise and slip noise that occurs when a sudden load is applied when tension is reduced during traveling.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a V-ribbed belt according to the present invention. A V-ribbed belt main body 1 includes a tensile member 2 made of a rope with low elongation and high strength such as polyester, nylon, aramid, carbon, and glass fiber. , SBR, CR, NBR, HNBR,
A flat belt-shaped tensile body layer 4 embedded in an adhesive rubber layer 3 made of a single material such as CSM or polyurethane or a blend thereof is arranged in the center, and an upper side of the tensile body layer 4 is arranged. To 1
-A plurality of canvases with rubber 5 are laminated, on the other hand, a compression rubber layer 6 made of the same material as the adhesive rubber layer 3 is provided below the tensile body layer 4, and a plurality of compression rubber layers 6 are provided below the compression rubber layer 6. The belt structure is provided with the V-shaped rib 7.

As is already known in the compressed rubber layer 6, short fibers 8 having a length of 3 to 10 mm and made of cotton, nylon, vinylon, polyester, aramid or the like are contained in the rubber 100 as required. 3 parts by weight of aramid fiber
Needless to say, -10 parts by weight, and other synthetic fibers may be oriented and mixed in the belt width direction at a ratio of 5 to 15 parts by weight.

The compression rubber layer 6 is a feature of the present invention, and as shown in Table 1 below, 100 parts by weight of chloroprene rubber GW is mixed with various compounding chemicals, and further has a melting point of 40 to 80 ° C. 0.75 to 1.50 parts by weight of wax, specifically paraffin wax or microcrystalline wax (trade name: Suntite C [Ouchi Shinko Kagaku]) is mixed with 100 parts by weight of rubber. The wax mixed in the V-shaped ribs blooms over time,
It moves to the rib rubber surface, and as a result, it has the effect of reducing the frictional resistance of the V-shaped rib surface and making the rib surface smooth.

If the amount of this wax mixed is less than 0.75 parts by weight, the effect of lowering the coefficient of friction cannot be fully exerted, and
If the amount is 1.5 parts by weight or more, there is a problem that the amount of transfer to the rubber surface is too large and the belt slips and the transmission force does not decrease.

[0013]

[Experimental example] Next, the V-ribbed belt shown in FIG.
Form 4 rib crest, length 1100 mm)
V-ribbed belt 1 according to the present invention using the rubber compound of
For the conventional V-ribbed belts 10 and 10 'in which 0.5 parts by weight of wax and rubber are not mixed in the rubber compound, a slip sounding test at a low tension and an adhesive sounding test at an overtension are evaluated to confirm the effect. A specific experimental example will be described.

[0014]

[Table 1]

.. Slip sound test at low tension As shown in FIG. 2, a driving pulley (Dr) with a diameter of 135 mm,
A tensioner pulley (Tn) with a diameter of 60 mm, and an accessory drive device configured with an accessory pulley (Df) with a diameter of 112 mm connected to an air compressor (A / C), the three belts are suspended in sequence, Drive pulley (D
The belt tension is 20 at r) of 5,000 rpm.
Initial tension is applied by the tensioner pulley so that it becomes a 6N (Newton) / 4 rib, and the air compressor (A /
By repeating OFF-ON of C), a sudden load was applied to the accessory pulley (Df), and the squeal of the belt (slip sound) was confirmed. As a result, it was confirmed that the belt of the present invention did not generate a slip noise, but the conventional belt generated a slip noise.

.. Adhesive sounding test under overtension As shown in FIG. 3, the above three belts are suspended in sequence to a driving device including a driving pulley (Dr) having a diameter of 168 mm and a driven pulley (Dn) having a diameter of 72 mm, and the driving pulley (Dr) The squeal test of the belt was confirmed by setting the number of revolutions at 600 rpm and the belt tension to be 735 N / 3 ribs. As a result, the belt of the present invention did not generate adhesive noise, but the conventional belt generated adhesive noise.

[0017]

As described above, according to the present invention, by mixing a predetermined amount of wax in the compressed rubber layer mainly composed of chloroprene rubber, the wax in the rubber compound forming the compressed rubber layer is rubbed with the lapse of time. By moving to the rib surface of the transmission section to reduce the friction coefficient, sound was generated due to adhesion generated when the belt was stretched due to over tension at the beginning of belt running, and a sudden load was applied when the tension decreased during running. It is possible to prevent the occasional slip sound.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a V-ribbed belt according to the present invention.

FIG. 2 is a schematic diagram showing a running test in an accessory drive system.

FIG. 3 is a schematic diagram showing a driving test with a drive device.

[Explanation of symbols]

 1 V-ribbed belt 2 Tensile rope 3 Adhesive rubber layer 4 Tensile body layer 5 Canvas with rubber 6 Compressed rubber layer 7 V-shaped rib 8 Short fiber 9 Wax

Claims (1)

[Claims] 1. A V-ribbed belt having a compression rubber layer in which a plurality of V-shaped ribs extending in the belt longitudinal direction are juxtaposed on the lower surface of the tension layer in which a tension body is embedded in an adhesive rubber layer. The V-ribbed belt is characterized in that the layer is a rubber compound in which 0.75 to 1.50 parts by weight of a wax having a melting point of 40 to 80 ° C. is mixed and mixed with 100 parts by weight of rubber mainly composed of chloroprene polymer.