JP2000274491A - V-ribbed belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To check sound generation by pressure sensitive adhesion at back face driving time, and to improve durability by covering an extension part with a film of superhigh molecular weight polyethylene and a belt back face with a film of superhigh molecular weight polyethylene. SOLUTION: A belt 1 uses respective fibers of polyester, Aramid and glass as a raw material, a conductor 2 composed of a cord having high strength and low ductility is embedded in an adhesive rubber layer 3, a compressed rubber layer 4 of an elastic body layer is provided on the lower side, cross-sectional almost triangular plural rib parts 7 extending in the belt lengthwise direction are arranged in this compressed rubber layer, and an extension part 12 covered with a superhigh molecular weight polyethylene film 5 is arranged on a belt back face 10. Superhigh molecular weight polyethylene has average molecular weight of 1,750,000 to 2,000,000 measured by a viscosity method, and a melting point is about 140 deg.C. The film 5 requires transparency of a degree capable of sufficiently discriminating a mark 6 through this film. Since such constitution does not cause pressure sensitive adhesion on the belt back face, a vertical crack is not caused, and a V-ribbed belt is not abraded even if a back face idler pulley is used.

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. The present invention relates to a V-ribbed belt that prevents a mark from appearing and does not disappear.

[0002]

2. Description of the Related Art In a V-ribbed belt, a core wire is buried in an adhesive rubber layer, a cover canvas is laminated on an upper portion of the adhesive rubber layer as necessary to form an extension, and a plurality of belts are provided below the adhesive rubber layer. Are provided. This V-ribbed belt is
Instead of a belt, it has been widely used for power transmission of a multi-shaft drive such as a water pump or a generator of an automobile.

[0003] In addition, after a cover canvas is subjected to RFL treatment as is usually performed with a belt using chloroprene rubber, rubber is further adhered in order to improve moldability and adhesion to an adhesive rubber layer. However, when power is transmitted using the back surface of the belt, there is a problem that the rubber attached to the cover canvas tends to stick due to frictional wear between the pulley and the cover canvas.

[0004] Usually, a mark of a production lot or the like is engraved on the back of the belt by transfer. However, when power is transmitted through the back, the back of the belt wears out, so that the mark disappears and becomes invisible. It almost disappeared.

[0005] Conventionally, natural rubber, styrene-butadiene rubber and chloroprene rubber have been mainly used for V-ribbed belts. However, under a high-temperature atmosphere, there is a problem that cracks occur early in the cured compressed rubber layer.

[0006] In response to such an early breakage phenomenon of the belt,
Improvements in the heat resistance of chloroprene rubber have been studied, and although some improvements have been made, there is a limit as long as chloroprene rubber is used, and a sufficient effect has not yet been obtained.

For this reason, the use of rubbers having a highly saturated or completely saturated main chain, such as chlorosulfonated polyethylene rubber, hydrogenated nitrile rubber, and fluoro rubber, which are excellent in heat resistance, has been studied. . Of these, chlorosulfonated polyethylene is generally equivalent to chloroprene rubber in terms of dynamic fatigue, abrasion resistance, and oil resistance, but it is known that the vulcanization system, especially the acid acceptor, has a large effect on water resistance. I have. Usually, oxides such as MgO and PbO have been used as acid acceptors for chlorosulfonated polyethylene.

However, PbO, Pb_ThreeO_FourEtc. of lead compounds
If an acid acceptor is used, a belt with good water resistance can be obtained.
However, use of lead compounds is preferred due to pollution and hygiene issues.
Absent. When MgO is used as an acid acceptor,
MgCl generated during the bridge reaction _TwoSignificantly impairs water resistance
Note that the belt application was unsuitable. Meanwhile, metal
Although it is possible to obtain oxides, odors are generated and
There was a problem of discomfort.

[0009]

However, this V-ribbed belt has a significantly improved belt running life under a high temperature atmosphere and excellent heat resistance as compared with a belt using chloroprene rubber. It was found that the belt running life under a low temperature atmosphere of not more than ° C was significantly inferior. The reason for this is that conventional chlorosulfonated polyethylene rubber is a chlorosulfonated polyethylene, which contains chlorine, so that the cohesive energy of chlorine increases at low temperatures and the rubber hardens in the low temperature range, causing the rubber to harden. This is presumed to be due to lack of elasticity and easy cracking.

On the other hand, ethylene-alpha-olefin elastomers such as ethylene-propylene rubber (EPR) and ethylene-propylene-diene rubber (EPDM) have excellent heat resistance and cold resistance, and Although it is an inexpensive polymer, it does not have oil resistance, so it is not actively used for such applications.

Further, the ethylene-propylene rubber has a low tearing power, and the use of a peroxide cross-linking system further lowers the tearing power, so that there is a problem that the cord tends to pop out during running. On the other hand, in the case of using a sulfur cross-linking system, it is difficult to sufficiently increase the degree of vulcanization, so that abrasion increases during running. This was a major problem that caused pronunciation. Also,
When EPDM having an extremely large amount of double bonds in the molecule is used to increase the degree of vulcanization, adhesive abrasion can be improved to some extent, but the problem that heat resistance is lowered occurs.

The present invention has been made to solve the above problems, and provides a V-ribbed belt in which sound generation due to sticking is prevented at the time of driving the rear surface. It is an object of the present invention to provide a V-ribbed belt that improves the durability of the belt during running under the belt.

[0013]

That is, the present invention as defined in claim 1 of the present application provides an adhesive rubber layer in which a core wire is buried along a stretching portion and a belt longitudinal direction, and a belt adjacent to the adhesive rubber layer. A V-ribbed belt comprising a compression rubber layer having a plurality of ribs extending in a circumferential direction, wherein the extension portion is made of an ultra-high molecular weight polyethylene film, and the back surface of the belt is covered with an ultra-high molecular weight polyethylene film. Located on V-ribbed belt.

According to the first aspect of the present invention, since the back surface of the belt is coated with the ultra-high molecular weight polyethylene film, no sticking occurs at the back surface of the belt. There is no scattering of rubber powder.

According to a second aspect of the present invention, there is provided a V-ribbed belt in which a mark material is provided on the adhesive rubber layer, and at least a translucent ultrahigh molecular weight polyethylene film is laminated on the mark material.

According to the second aspect of the present invention, a mark material is disposed on the adhesive rubber layer, and at least a translucent ultrahigh molecular weight polyethylene film is laminated on the mark material, whereby the mark is at least transparent. It can be read through a high molecular weight polyethylene film, and since the marks do not wear or wear directly, the marks on the belt can be read during and after use of the belt,
Even after the use of the belt, the production lot of the belt can be known.

According to a third aspect of the present invention, the adhesive rubber layer comprises a sulfur-crosslinked vulcanized ethylene-alpha-olefin elastomer, and the compressed rubber layer comprises an ethylene-alpha-olefin crosslinked organic peroxide. The V according to claim 1 or 2, wherein a crosslinked product of an olefin elastomer is used.
On the ribbed belt.

According to the third aspect of the present invention, a sulfur-crosslinked vulcanized ethylene-alpha-olefin elastomer is used as an adhesive rubber layer, and an ethylene-alpha-olefin is used as a compressed rubber layer. By using the crosslinked product of the olefin elastomer, the adhesive force between the core wire and the adhesive rubber layer is increased, and the service life of the belt in a high-temperature atmosphere is improved.

According to a fourth aspect of the present invention, there is provided a V-ribbed belt comprising an adhesive rubber layer having a core buried in the longitudinal direction of the belt and an elastic layer including a compression rubber layer. 0.2 to 10 parts by weight of N, N'-m-phenylenedimaleimide is added to 100 parts by weight of the α-olefin elastomer, and a peroxide-cured rubber layer is used. The V-ribbed belt is characterized in that the back surface of the belt is covered with the ultrahigh molecular weight polyethylene film by being composed of a high molecular weight polyethylene film.

According to the present invention, 0.2 to 10 parts by weight of N, N'-m-phenylenedimaleimide is added to at least the compressed rubber layer based on 100 parts by weight of the ethylene-α-olefin elastomer. The V-ribbed belt, which uses a peroxide-cured rubber layer and further coats the back of the belt with an ultra-high molecular weight polyethylene film, has excellent heat resistance and cold resistance, and has an adhesive resistance on the compressed rubber part and the back of the belt. Wear can be improved to improve the durability of the belt.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A V-ribbed belt 1 shown in FIG.
A core wire 2 made of a high-strength, low-elongation cord made of polyester fiber, aramid fiber, or glass fiber is embedded in an adhesive rubber layer 3, and a compression rubber layer 4 as an elastic layer is provided below the core wire. are doing. The compression rubber layer 4 is provided with a plurality of ribs 7 having a substantially triangular cross section extending in the longitudinal direction of the belt, and an extension 12 having a belt back surface 10 covered with a film 5 of ultrahigh molecular weight polyethylene.

Ultra-high molecular weight polyethylene is defined herein as at least 17500 as measured by the known viscosity method.
In a sense accepted by those skilled in the art as defining a substantially linear polyethylene having an average molecular weight of from about 00 to 2,000,000 and typically not exhibiting appreciable flow under any of the conditions described in ASTM-D1238. Used. These polyethylenes are commonly available in a continuous film having a thickness of 0.005 inches to 0.04 inches as shown in FIG. The melting point of these polyethylenes is about 140 ° C.

The ultrahigh molecular weight polyethylene film 5 is made endless by applying a joint 9 to the end portion thereof by a method such as welding as shown in FIG.

The ultra-high molecular weight polyethylene film 5 needs to be transparent enough to allow a mark to be sufficiently distinguished through the film 5, and a transparent film is more preferable than a translucent film.

As shown in FIG. 5, the mark material 8 is composed of a mark 6 printed on the non-woven rayon paper 13 and a rubber paste 15 attached to the side of the non-woven rayon paper 13 opposite to the mark 6. However, the mark material 8 is not limited to this configuration.

The ribs 7 include hydrogenated nitrile rubber, chloroprene rubber, natural rubber, CSM, ACSM, SBR
The hydrogenated nitrile rubber has a hydrogenation rate of 80% or more, and preferably 90% or more in order to exhibit heat resistance and ozone resistance characteristics. A hydrogenated nitrile rubber having a hydrogenation rate of less than 80% has extremely low heat resistance and ozone resistance. In consideration of oil resistance and cold resistance, the amount of bound acrylonitrile is preferably in the range of 20 to 45%.

Further, the ribs 7 are mixed with short fibers made of cotton to improve the lateral pressure resistance of the ribs 7 and to project the short fibers on the surface of the ribs 7 which are to be in contact with the pulleys. Reduce the coefficient of friction to reduce noise during belt running. Further, short cotton fibers are projected from the surface of the rib 7 to absorb water adhering to the surface of the rib 7. Short fibers include nylon 6, nylon 66, polyester, and aramid fibers in addition to cotton. Cotton, which absorbs moisture most easily, is most suitable. The short cotton fiber is added in an amount of 5 to 20 parts by weight based on 100 parts by weight of the rubber. If the added amount of the short cotton fiber is less than 5 parts by weight, there is no water absorbing effect, and the water adhering to the surface of the rib 7 cannot be sufficiently absorbed. On the other hand, if the added amount of the cotton short fiber exceeds 20 parts by weight, the short fiber will not be uniformly dispersed in the rubber.

In order to improve the adhesion of the ribs 7 to the rubber, the cotton short fibers are bonded with a treatment liquid selected from an epoxy compound and an isocyanate compound.

The above-mentioned core wire 2 is made of ethylene-
Adhesive-treated cords having a total denier of 4,000 to 8,000 obtained by twisting polyester fiber filaments having 2,6-naphthalate as a main constituent unit are used. The number of twists of this cord is 10 to 23/10 cm, and the number of twists is 17 to 38/10 cm. When the total denier is less than 4,000, the modulus and strength of the cord become too low, and when it exceeds 8,000,
The thickness of the belt is increased, and the bending fatigue is deteriorated.

The ethylene-2,6-naphthalate used in the present invention is usually prepared by condensation polymerization of naphthalene-2,6-dicarboxylic acid or an ester-forming derivative thereof with ethylene glycol in the presence of a catalyst under appropriate conditions. To be synthesized. At this time, if one or more appropriate third components are added before the completion of the polymerization of ethylene-2,6-naphthalate, a copolymer polyester is synthesized.

The bonding process of the core wire 2 is carried out by (1) first impregnating an untreated cord into a tank containing a treatment liquid selected from an epoxy compound and an isocyanate compound and pre-dipping the cord; Drying by passing through a drying oven set to a temperature of 30 ° C. for 30 to 600 seconds.
Immerse in the tank containing the adhesive liquid consisting of L liquid, (4) 2
3 to the stretching heat setting processor set at 10-260 ° C
It is stretched for -1 to 3% through 0 to 600 seconds to obtain a stretched cord.

Examples of the epoxy compound include polyhydric alcohols such as ethylene glycol, glycerin, and pentaerythritol; reaction products of polyalkylene glycols such as polyethylene glycol with halogen-containing epoxy compounds such as epichlorohydrin; (4-hydroxyphenyl) dimethylmethane,
It is a reaction product with polyhydric phenols such as phenol-formaldehyde resin and resorcin-formaldehyde resin and halogen-containing epoxy compounds. This epoxy compound is used by being mixed with an organic solvent such as toluene and methyl ethyl ketone.

The RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formalin, and the latex used here includes chloroprene, styrene / butadiene / vinylpyridine terpolymer, hydrogenated nitrile, NBR, etc. It is.

The cord subjected to the stretching heat setting treatment has a spinning pitch, that is, a core winding pitch of 1.0 to 1.0 mm.
By setting the thickness to 1.3 mm, a belt having a high modulus can be finished. If it is less than 1.0 mm, the cord cannot ride on the adjacent cord and cannot be wound,
On the other hand, if it exceeds 1.3 mm, the modulus of the belt gradually decreases.

The V-ribbed belt using the cord 4 has a tensile modulus of at least 17,000 N / rib, preferably 2
2,000 to 33,000 N / rib, and with such a tensile modulus, even if there is a torque fluctuation in the drive shaft, the belt expands due to the belt tension fluctuation, and in this state, it has a large rotational inertia. Even if the V-ribbed belt follows the generator 13, the V-ribbed belt does not expand rapidly, and vibration and abnormal noise on the slack side are reduced.

In addition, an initial load of 147N is applied to the belt,
To give a characteristic that the belt has a shrinkage stress on dry heat generated after being left for 30 minutes in an atmosphere of 100 ° C for 100 to 200 N, the V-ribbed belt 1 has a small belt slip ratio and a long belt life. Was completed. If the shrinkage stress during dry heating of the belt is less than 100 N, the belt tends to stretch easily, the belt tension is greatly reduced, and the slip ratio tends to increase. When the belt shrinkage stress during dry heating exceeds 200 N, the belt length tends to shrink with time, and the effect of reducing the slip ratio is small.

When the aramid fiber is used, the modulus of the belt can be increased. However, since there is no heat shrinkage, a separate auto tensioner is required, and there is a disadvantage that the transmission mechanism is complicated. However, ethylene-2,6
-A core wire using a polyester fiber whose main constituent unit is naphthalate causes heat shrinkage, so that an auto tensioner may not be used.

Here, a method for manufacturing the V-ribbed belt of the present invention will be described. An example of the method for manufacturing the V-ribbed belt of the present invention is as follows. First, a smooth cylindrical mold is coated with at least one translucent film 5 of ultra-high molecular weight polyethylene whose ends are melt-joined, and then the mark material 8 is marked so that the side on which the rubber paste 15 is attached faces the outside. The material 8 is coated on the ultra high molecular weight polyethylene film 5 so as to be laminated. Next, the adhesive rubber layer 3 is wound, the cord 2 made of a rope is spirally spun, and a compression rubber layer 4 is further arranged. Then, a vulcanization jacket is inserted on the compression rubber layer 4. Next, the mold is placed in a vulcanization can, and after vulcanization, the cylindrical vulcanization sleeve is removed from the mold. Next, the vulcanizing sleeve is removed from the driving roll and the driven roll, and the vulcanizing sleeve is run around the other driving roll and the driven roll, cut into a predetermined width by a cutter, and finished into individual V-ribbed belts. .

The V-ribbed belt 1 manufactured by the above manufacturing method has a back surface 10 covered with at least a translucent film 5 of ultra-high molecular weight polyethylene, and a mark is formed on the adhesive rubber layer 3 inside the film 5. Since the mark 6 is engraved, the mark 6 can be sufficiently identified from the belt back surface 10 through the film 5. Further, since the mark 6 does not come into direct contact with an object such as an idler pulley, the mark 6 does not wear out even after the V-ribbed belt 1 is used.

[0040]

The present invention will be described below in more detail with reference to specific examples. Examples 1 to 3 and Comparative Examples 1 to 4 In the V-ribbed belt manufactured in this example, a core made of a polyester fiber rope was embedded in an adhesive rubber layer, and a 0.25 mm-thick ultra high molecular weight polyethylene was The film (trade name: Technol) is laminated, and a mark is engraved between the adhesive rubber layer and the film.
On the other hand, a compression rubber layer is provided below the adhesive rubber layer, and has three ribs in the belt longitudinal direction. The obtained V-ribbed belt is a K-type 3-ribbed belt having a length of 975 mm according to the RMA standard, a rib pitch of 3.56 mm and a rib height of 2.
9 mm, belt thickness 5.3 mm, rib angle 40 °.

Here, the compressed rubber layer and the adhesive rubber layer were each prepared from the rubber composition shown in Table 1, kneaded with a Banbury mixer, and then rolled with calender rolls. The compressed rubber layer contains short fibers and is oriented in the belt width direction.

In Comparative Example 1, a belt was used in which the adhesive rubber was exposed on the back without a film laminated on the adhesive rubber layer.
Further, a mark material was laminated on the surface of the adhesive rubber. Comparative Example 2
In Nos. To 4, a plain weave cloth made of aramid fiber was laminated on the adhesive rubber layer. Then, the cloth was bonded and hardened by RFL processing. Further, a mark material was placed on the surface of the cloth to print a mark.

[0043]

[Table 1]

The method of manufacturing the belt is a usual method. First, at least one translucent film of ultra-high-molecular-weight polyethylene whose ends are melt-joined to a smooth cylindrical mold is coated with at least a semi-transparent film. The mark material is coated on the ultra-high molecular weight polyethylene film so as to be laminated on the ultra-high molecular weight polyethylene film so that the side of the mark is outside. Next, the adhesive rubber layer is wound, the core wire is spun, and the compressed rubber layer is further arranged. Then, a crosslinking jacket is inserted on the compressed rubber layer. Next, after putting the mold in a vulcanizer and crosslinking, the tubular crosslinking sleeve is removed from the mold,
Forming a compressed rubber layer of the sleeve into ribs by a grinder and cutting the molded body into individual belts.

The V-ribbed belt thus obtained was subjected to peeling test of adhesive rubber and core wire, heat-resistant running test, and evaluation of the presence or absence of adhesion and abrasion of the rib portion by the running test at room temperature. The appearance after the test was evaluated. The results are shown in Tables 2 and 3.

The running test machine used for the evaluation of the heat resistant running test includes a driving pulley (120 mm in diameter), a driven pulley (120 mm in diameter), and an idler pulley (70 m in diameter).
m) and a tension pulley (diameter: 45 mm). A belt is hung on each pulley of the testing machine, the ambient temperature is 120 ° C, and the number of rotations of the driving pulley is 4
The driven pulley was run at 900 rpm and the tension pulley was applied with an initial tension of 57 kgf.

In the evaluation of the presence or absence of back surface adhesion by a running test at room temperature, a drive pulley (diameter of 70 m
m), a driven pulley (120 mm in diameter) is used in combination, a load of 11.2 hp is applied to the driven pulley, tension is applied by applying 120 kgf with a dead weight, and the rotational speed of the driving pulley is 700 to 200
The belt was run while sweeping at 0 rpm for about 15 ± 5 seconds, and attached so that the back of the belt was in contact with the pulley.

The idler pulley is engaged at the back of the V-ribbed belt 1, and its wrapping angle is about 90 degrees. By this running test method, the time until cracks occurred in the rib portions of the belt was measured, and the heat resistance performance was compared.

In the evaluation of the presence or absence of adhesive wear of the rib portion by a running test at room temperature, a driving pulley (120 mm in diameter), a driven pulley (120 mm in diameter), and a tension pulley (45 mm in diameter) were combined as a running test machine. Using the arrangement, the driven pulley was applied with a load of 12 hp, the driving pulley was rotated at 4900 rpm, and the tension pulley was run with an initial tension of 85 kgf.

In the peeling test, two core wires of the V-ribbed belt were peeled off at a speed of 50 mm / min under an ambient temperature of 23 ° C. and 120 ° C. using a strograph T.

[0051]

[Table 2]

[0052]

[Table 3]

As is evident from the results in Table 2, it can be seen that the belt having the back surface coated with the ultra-high molecular weight polyethylene film does not cause back adhesion.

Further, as is clear from the results in Table 2, in the belt in which the back surface of the belt was covered with an ultrahigh molecular weight polyethylene film and the mark was provided on the adhesive rubber inside the ultrahigh molecular weight film, the mark was worn or worn. It can be seen that the mark can be read sufficiently even after the running test.

Further, as is clear from the results in Tables 2 and 3, ethylene-crosslinkable ethylene peroxide was used as the rib portion.
The belt of the present invention using a rubber composition of propylene rubber and also using a rubber composition of sulfur-crosslinkable ethylene-propylene rubber for the adhesive rubber layer has an adhesive force between the core wire and the adhesive rubber layer as compared with a conventional belt. It can be seen that the belt life in a high-temperature atmosphere is improved, and that the ribs are less likely to undergo adhesive wear.

[0056]

As described above, according to the present invention,
Since the back surface of the belt is covered with the ultra-high molecular weight polyethylene film, there is no sticking at the back surface of the belt, so that there is an effect that the belt does not split vertically and the rubber powder does not scatter from the back surface of the belt. Further, even when the belt is run using the back idler pulley, there is an effect that the back of the belt is not worn.
Furthermore, since the ultra-high molecular weight polyethylene film has a greater tearing force than rubber or canvas, even if the belt is used in the engine room, there is also an effect that the belt will not be damaged even if there is contact with the back of the belt by pebbles etc. .

According to the second aspect of the present invention, the mark is at least translucent by disposing a mark material on the adhesive rubber layer and laminating at least a translucent ultra-high molecular weight polyethylene film on the mark material. High-molecular-weight polyethylene film, and the marks do not directly wear or wear, so that the marks on the belt can be read both during and after use of the belt. There is an effect that the production lot of the product can be known.

According to the third aspect of the present invention, a sulfur-crosslinked vulcanizate of an ethylene-alpha-olefin elastomer is used as an adhesive rubber layer, and an ethylene-alpha-olefin is used as a compression rubber layer. By using a crosslinked product of an olefin elastomer, there is an effect that the adhesive force between the core wire and the adhesive rubber layer is increased, and the life of the belt in a high-temperature atmosphere is improved.

According to the present invention, 0.2 to 10 parts by weight of N, N'-m-phenylenedimaleimide is added to at least the compressed rubber layer based on 100 parts by weight of the ethylene-α-olefin elastomer. The V-ribbed belt, which uses a peroxide-cured rubber layer and further coats the back of the belt with an ultra-high molecular weight polyethylene film, has excellent heat resistance and cold resistance, and has an adhesive resistance on the compressed rubber part and the back of the belt. There is an effect that the wear can be improved and the durability of the belt can be improved.

[Brief description of the drawings]

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

FIG. 2 does not show a film of ultra-high molecular weight polyethylene used in the present invention.

FIG. 3 is a diagram in which an ultra high molecular weight polyethylene film is finished in an endless shape.

FIG. 4 is a perspective view of a V-ribbed belt of the present invention.

FIG. 5 is a diagram showing a mark material used in the present invention.

[Explanation of symbols]

 Reference Signs List 1 V-ribbed belt 2 core wire 3 adhesive rubber layer 4 compressed rubber layer 5 film 6 mark 7 rib portion 8 mark material 9 joint portion 10 back surface 12 extension portion

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16G 5/00 F16G 5/00 E 5/04 5/04 5/20 5/20 A // C08L 23: 16

Claims (4)

[Claims] 1. A V-ribbed belt comprising: an extension portion; an adhesive rubber layer having a core buried along the longitudinal direction of the belt; and a compressed rubber layer having a plurality of ribs extending in the circumferential direction of the belt adjacent to the adhesive rubber layer. 3. The V-ribbed belt according to claim 1, wherein the extension portion is made of an ultrahigh molecular weight polyethylene film, and the back surface of the belt is covered with the ultrahigh molecular weight film. 2. The V-ribbed belt according to claim 1, wherein a mark material is disposed on the adhesive rubber layer, and at least a translucent ultrahigh molecular weight polyethylene film is laminated on the mark material. 3. A vulcanizate of a sulfur-crosslinked ethylene-alpha-olefin elastomer as the adhesive rubber layer, and a crosslinked product of an ethylene-alpha-olefin elastomer crosslinked with an organic peroxide as the compression rubber layer. The V-ribbed belt according to claim 1 or 2, wherein 4. A V-ribbed belt comprising an adhesive rubber layer in which a cord is embedded along the longitudinal direction of the belt and an elastic layer including a compression rubber layer, wherein at least the compression rubber layer has 100 parts by weight of an ethylene-α-olefin elastomer. With N, N'-m-phenylenedimaleimide in the range of 0.2 to 10
It is characterized by using a rubber layer added by weight and peroxide-vulcanized, and further comprising an ultrahigh molecular weight polyethylene film on the extension part on the back side of the belt to cover the backside of the belt with the above ultrahigh molecular weight polyethylene film. V-ribbed belt.