JPH0228022B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a power transmission belt, and more specifically, a gas member mixed with at least ceramic whiskers is attached to a woven fiber member such as canvas or nonwoven fabric as a cover layer, and the cover layer is used. The present invention relates to power transmission belts such as toothed belts, V-ribbed belts, and V-belts made by improving the abrasion resistance of fiber members. (Prior Art) In recent years, with the social background of energy and resource conservation, extending the lifespan and increasing the load of power transmission belts has become an important issue. For example, recently, V-ribbed belts have been put into practical use, in which a single V-belt is attached to and driven by a plurality of pulleys in a meandering manner in order to save space, reduce weight, and save fuel consumption. However, this V-ribbed belt also contacts the idler pulley to adjust the belt tension and drives from the back, so the back side of the V-ribbed belt, that is, the rubberized canvas layer, wears out severely, causing fluctuations in belt tension and causing belt slip. There was a problem. For this reason, the characteristics generally required for power transmission belts are high elasticity and abrasion resistance in the belt width direction, and good bending resistance in the longitudinal direction. It is also an important requirement to improve the abrasion resistance of the rubber canvas attached to the belt surface itself. For example, in U.S. Pat. No. 4,355,994 or U.S. Pat. No. 4,464,153, in order to reduce the coefficient of friction between the belt and the pulley, metal powder is mixed into the elastomer laminated on the cover canvas and this elastomer is exposed on the surface. A V-belt is disclosed. On the other hand, as the speed of engines increases, toothed belts
As the usage conditions become harsher, there are problems such as thermal deterioration and abrasion of the canvas that protects the teeth due to high heat, which can damage the teeth and shorten the life of the belt. Alternatively, it has been proposed to cover the surface of a cover canvas with a film having abrasion resistance such as ultra-high molecular weight polyethylene. (Problem to be solved by the invention) However, the above V level is attached to the drive device of machinery used outdoors such as agricultural machinery, civil engineering construction machinery, etc. They are placed in an environment where they are easily influenced. the result,
If metal powder such as iron powder that is likely to cause rust is mixed into the elastomer layered on the cover canvas, the friction coefficient of the cover canvas layer will increase in a short period of time, resulting in severe wear of the cover canvas layer. , it was necessary to select metal powder. Furthermore, the metal powder is exposed on the surface of the cover canvas, and as a result, the metal powder sometimes detaches from the elastomer and scatters while the belt runs. On the other hand, in the case of a toothed belt, if the cover canvas is made in multiple layers or a film is laminated on the cover canvas to increase the thickness of the cover canvas layer,
Although the abrasion resistance of the cover canvas layer was improved, there was a major drawback in that the flexibility of the belt deteriorated. The present invention improves these points,
The object of the present invention is to provide a power transmission belt that has improved abrasion resistance of the cover layer of the belt and can be used for a long time under any environment. (Means for Solving the Problems) That is, the present invention is characterized in that, as a cover layer, a fiber member is impregnated with a rubber member in which at least 2 to 60 parts by weight of ceramic whiskers are dispersed per 100 parts by weight of rubber. The present invention provides a power electric belt in which such a cover layer is adhered to the surface of the belt with the rubber member exposed. In this way, when a cover layer in which a rubber member containing at least ceramic whiskers is impregnated and adhered to a fiber member is placed on the belt surface layer, first, the ceramic whiskers used are needle-like crystals, and due to the specificity of their shape, they become rubbery. The whiskers stick strongly into the component and protrude from the surface, and the whiskers themselves are extremely hard, so even if the protruding portion of the whisker comes into contact with the pulley, it will not come off and scatter, and it will sufficiently protect the fiber component. , has the effect of finishing the cover layer with wear resistance. The power transmission belt according to the present invention includes a toothed belt that meshes with and drives a pulley, or a belt that frictionally engages with a pulley, such as a V belt, a V-ribbed belt, a banded belt, and a flat belt. A toothed belt 1 shown in the figure has teeth portions 2 and groove portions 3 alternately at a constant pitch in the longitudinal direction of the belt, and a rope made of glass fiber, polyester fiber, or aramid fiber is placed on the belt pitch line of the belt extension portion 5. A tensile member 4 having a shape is embedded therein, and a cover layer 6 is adhered to the surfaces of the teeth 2 and grooves 3. On the other hand, in the V-ribbed belt 10 shown in FIG. 2, a tensile member 11 made of a high-strength, low-elongation cord made of polyester fiber, aramid fiber, or glass fiber is embedded in an adhesive rubber layer 12, and a tensile member 11 is embedded under the adhesive rubber layer 12. A compressed rubber layer 13 is provided adjacent to the belt, and the compressed rubber layer 13 has a plurality of ribs 14 having a trapezoidal cross section in the longitudinal direction of the belt. A cover layer 15 is provided on the surface of the adhesive rubber layer 12. The cover layer 6 attached to the various belts mentioned above is
As shown in FIG. 3, a rubber member 22 in which an inorganic filler made of at least ceramic whiskers 21 is dispersed and mixed is impregnated into a plain weave fiber member 20 consisting of warp threads 18 and weft threads 19, and penetrates into the opening area of the fiber member and adheres thereto. are doing. This whisker 21
is a needle-like crystal body and is a relatively soft rubber member 22
The rubber member 2 has a shape that easily protrudes onto the surface of the rubber member 2.
It has reached a point where it has reached 2. the result,
The cover layer 6 has protruding ceramic whiskers 2.
1 is dispersed in large numbers to lower the surface friction coefficient of the cover layer 6 and protect the fiber member 20. Incidentally, the fiber member 20 can also be made of nonwoven fabric. Ceramic whiskers include α-silicon carbide (α-Sic), β-silicon carbide (β-Sic), silicon nitride (Si ₃ N ₄ ), α-alumina (Al ₂ O ₃ ), boron nitride (BN), It is made of zirconium boronide (ZrB ₂ ), boron carbide (B ₄ C), etc., and has a diameter of
It is a needle-like single crystal with a shape of about 0.05 to 3 μm and a length of about 5 to 500 μm. In order to add the ceramic whiskers to rubber, the rubber may be treated with a silane coupling agent, a titanium coupling agent, etc., or a silane coupling agent or a titanium coupling agent may be added when mixing with the rubber. is also possible. This results in better dispersibility in rubber. The amount of whiskers added is 2 to 60 parts by weight, preferably 5 to 40 parts by weight, per 100 parts by weight of rubber. If the amount of whiskers added is less than 2 parts by weight, the effect of wear resistance will be small. On the other hand, if the amount exceeds 60 parts by weight, not only the adhesion with the rubber will decrease, but also the rubber member will fall off from the fiber part. Further, in the present invention, in addition to the above-mentioned ceramic whiskers, it is also possible to use a ceramic powder made of the same material as the whiskers but having a different form. However, the amount of ceramic powder filler added above is
The amount is 5 to 10 parts by weight per 100 parts by weight, and the amount of ceramic whiskers added is within the range of 2 to 60 parts by weight as described above. Rubbers used for the cover layers 6 and 15 in the present invention include CR (chloroprene rubber), NBR
(nitrile rubber), natural rubber, SBR (styrene-butadiene rubber), HNBR (hydrogenated nitrile rubber),
CSN (chlorosulfonated polyethylene rubber),
CHM (epichlorohydrin rubber), ACM (acrylic rubber), polyurethane, etc. are used alone or as a blend.In addition to ceramic whiskers and ceramic powder, this rubber includes commonly used softening agents, anti-aging agents, processing aids, and vulcanization accelerators. A crosslinking agent, a crosslinking agent, etc. are added, and each of these components is kneaded using a Banbury mixer, a kneader roll, or the like. The cover layers 6 and 15 are formed by frictionally coating the fiber member with a rubber compound using a calender, or by immersing the fiber member in rubber paste in which the rubber compound is dissolved in a solvent, and then using a roll coater, a doctor knife, or the like. can be manufactured. EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples. However, the present invention is not limited to the embodiments shown below, and can be modified as appropriate without departing from the above objectives. Embodiment As shown in FIG. 1, the toothed belt according to the present invention has teeth portions 2 and groove portions 3 alternately at a constant pitch in the longitudinal direction, and polyester fibers, glass fibers, or aramid fibers are formed on the belt pitch line. A high-strength, low-elongation rope-like tensile member 4 is positioned thereon, and has a stretchable rubber layer 5 on the upper side thereof, and a cover layer having a canvas with rubber on the surfaces of the belt teeth 2 and grooves 3. 6 is provided. In this toothed belt, the stretchable rubber layer 5 and the belt teeth 2 were made of a rubber compound using chlorosulfonated polyethylene rubber, and the tension member 4 was made of glass fiber. Then, as the cover layer 6,
Cover canvas made of polyamide fiber treated with RFL liquid (140D/1 x woolly processed yarn)
105D/2 120×140) is impregnated with the rubber glue shown in Table 1 and dried at a temperature of 100 to 150°C, and then the solid content is 10 to 50 parts by weight per 100 parts by weight of polyamide fiber. A rubber compound was used. The resulting toothed belt has 83 teeth and belt width.
This toothed belt is 19.1 mm in diameter and has a trapezoidal tooth profile (ZA), and this toothed belt is suspended between a driving pulley (18 teeth, 7200 rpm) and a driven pulley (36 teeth, 3600 rpm) at an ambient temperature of 130°C. After running the tension pulley (diameter 52mm) on the belt for 200 hours under a reverse bending angle of 120° and a load of 5P/S, the difference in the thickness of the canvas before and after running was measured. The remaining rate (%) of the canvas was calculated by dividing by the thickness of the canvas. The results are also listed in Table 1. The thickness of the canvas was measured using a projector using a sample cut from the groove of the belt.

[Table] From these results, it is clear that ceramic whiskers are rubber
When 60 parts by weight or more is added to 100 parts by weight, the residual rate of canvas tends to decrease. When such a rubber member is used, a phenomenon occurs in which the rubber member itself impregnated and attached to the fiber member separates from the fiber member and scatters during the initial stage of running, approximately 200 to 500 hours after running. A lot of fuzz was observed on the surface of the member, and it was observed that the fiber member was being worn. It is presumed that if a rubber member containing 60 parts by weight or more of ceramic whiskers mixed with 100 parts by weight of rubber is used, the presence of the ceramic whiskers deteriorates the adhesion with the fiber member. Therefore, the amount of ceramic whiskers added is preferably 60 parts by weight or less based on 100 parts by weight of rubber. On the other hand, the amount of ceramic whiskers added is
2 to 60 parts by weight, preferably 5 parts by weight per 100 parts by weight
At ~40 parts by weight, the fiber member adheres well to the rubber member, and the residual rate of the canvas is also high, indicating that the ceramic whiskers sufficiently protect the fiber member. Modified Embodiment As another embodiment, as shown in FIG. 2, a tensile member 11 made of a rope of high strength and low elongation made of polyester fiber, glass fiber, or aramid fiber is embedded in a cushion rubber layer 12, and a It has a structure in which a cover layer 15 made of multiple layers of rubberized canvas is laminated, a compressed rubber layer 13 is placed on the underside of the tensile member 11, and a plurality of ribs 14 (three ribs in the figure) are provided. There is. In the molded V-ribbed belt, the compressed rubber layer 13 is made of a chloroprene rubber compound in which cut cotton threads are oriented in the width direction of the belt, and the cover layer 15 is made of two plies of rubberized cotton fabric and the tensile material 11. polyester fiber was used. The belt length was 900 mm (outer circumference length). The cover layer 15 was treated in the same manner as in the previous example, and the rubber paste used is shown in Table 2. In the table, Comparative Example 2 is an example in which a rubber paste containing only ceramic powder is used, and Example 6 is an example of a rubber paste used in the present invention containing ceramic powder and ceramic whiskers. Example 7 is an example showing a rubber paste used in the present invention, which contains ceramic whiskers and a silane coupling agent. The rubberized canvas treatment agent is approximately 0.7 mm thick, and the treatment agent is 100 to 100 parts per 100 parts by weight of cotton fabric.
A solids content of 200 parts by weight of the rubber compound was deposited. The running test results of such a V-ribbed belt are shown in Table 2.
125 mm, 4800 rpm) and a driven pulley (125 mm in diameter), and the tension pulley (70 mm in diameter) is bent at a reverse angle of 120 degrees, no load, 150
It was run at an initial tension of lbs. and at room temperature. After running the belt for 500 hours, the remaining rate (%) of the canvas was determined in the same manner as in the above example. The results are shown in Table 2. Incidentally, the thickness of the canvas was measured using a projector using a sample obtained by cutting the groove of the belt in the same manner as in the above embodiment. As is clear from Table 2, the canvas wear of the V-ribbed belt having a cover layer made of a rubber member containing ceramic powder is slightly more advanced than that of the belt of the present invention. In contrast, the V-ribbed belt of the present invention is made of ceramic whiskers made of the same material as ceramic powder but of a different form, and the fiber members are less likely to wear out.

[Table] (Effects of the Invention) As described above, in the present invention, as a cover layer to be attached to the surface in contact with the pulley of various belts, a rubber material containing ceramic whiskers is impregnated and adhered to a fiber material. Ceramic whiskers, which tend to protrude from the surface of parts, protect fiber parts that are prone to wear and improve the wear resistance of the belt surface.The ceramic whiskers themselves are made of a material that does not corrode, so they can last for a long time even in hot and humid environments. If the amount of ceramic whiskers mixed into the rubber matrix is controlled, this rubber material will also adhere well to the fiber material and will not be scattered from the fiber material while the belt is running. A significant improvement in belt life is expected.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a toothed belt according to one embodiment of the present invention, FIG. 2 is a partial perspective view of a V-ribbed belt according to another embodiment of the present invention, and FIG. 3 is a line A-A in FIG. A cross-sectional view is shown. 1...Toothed belt, 6, 15...Cover layer, 2
0...Fiber member, 21...Ceramic whisker, 22...Rubber member.

Claims (1)

[Scope of Claims] 1. A rubber member in which at least 2 to 60 parts by weight of ceramic whiskers are dispersed and blended with 100 parts by weight of rubber is impregnated and adhered to a fiber member as a cover layer, and the cover layer is in a state where the rubber member is exposed. A power transmission belt characterized by being attached to the surface of the belt. 2. The power transmission belt according to claim 1, wherein the rubber member of the cover layer is a rubber composition in which at least ceramic whiskers and ceramic powder are added and mixed into rubber. 3. Claim 1, wherein the cover layer is a toothed belt attached to the surface of the belt teeth and grooves.
Power transmission belt as described in section. 4 V where the cover layer is attached to the back surface of the belt
The power transmission belt according to claim 1, which is a ribbed belt.