JPH10231901A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve compression strength and fatigue resistance of a block by blending an epoxy resin for the block with a filler made of carbon fiber and Aramid fiber in a specific range. SOLUTION: The overall surface of a metallic reinforcing material 10 of a block is covered with a resin part 11, but the resin part 11 is required at least to be provided on a part corresponding to a pulley contact surface to make contact with a pulley, and only a pulley contact part of the reinforcing material 10 can be covered with the resin part 11. As this resin part 11, an epoxy resin high in heat resisting mechanical strength, excellent in adhesion with the metallic reinforcing material 10, small in shrinkage percentage and excellent in dimensional stability is used. Additionally, carbon fiber and Aramid fiber are buried in this resin as fillers, but quantity of both of the carbon fiber and the Aramid fiber combined together is to be in a range of 20-80 weight part to an epoxy resin 100 weight part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt for high load transmission, comprising a center belt made of an elastomer and a block for reinforcing lateral pressure resistance.

[0002]

2. Description of the Related Art Conventionally, rubber V-belts and metal belts as disclosed in Japanese Patent Application Laid-Open No. 55-100443 have been used as belts applied to applications requiring high load transmission, such as continuously variable transmissions. Proposed. However, a rubber V-belt with a maximum surface pressure of 10 kg even for high load
/ Cm ² , and in applications where a torque greater than that is applied, the rubber V-belt cannot withstand high side pressure and is buckled.

[0003] A metal belt is excellent in lateral pressure resistance and can withstand a considerably high lateral pressure so that it does not buckle. However, in general, the speed change pulley is made of a metal material such as iron or aluminum alloy. Metal belt is used to prevent seizure and wear of the contact surface with the pulley.
You must keep running while supplying oil. In that case, a device for supplying oil must be provided, so that the belt transmission must be large.

Therefore, a block made of a hard resin or the like is fixed to a rubber belt in which a core body is embedded as a dry belt which does not require oil lubrication and which can withstand a high load, thereby increasing the strength in the belt width direction. Many belts with improved durability have been proposed.

As an example using such a block, a belt is disclosed in Japanese Patent Publication No. 62-7418, in which slots are provided on both sides of a block, and a rubber tension member is inserted into the slot. And JP-A-63-1
There has been proposed an arrangement in which an upper block and a lower block are respectively disposed above and below a center belt as disclosed in Japanese Patent No. 54833, and fixed with a fastening material such as a bolt or a rivet.

[0006] Such a belt does not require lubrication with oil because there is no contact between metal parts, and has the advantages that the drive unit can be reduced in weight and that there is no need for labor in terms of maintenance. ing. In Japanese Patent Publication No. 7-110900, a phenolic resin is mixed with acrylonitrile-butadiene rubber as a matrix, and a fibrous filling rate of 25 to 60 parts by weight including two fibers of carbon fiber and aramid fiber is blended. A block using a phenolic resin having a crystal layer thickness of 25 to 200 ° is disclosed.

[0007]

In the case of a belt used for such a high load application including driving of an automobile, the side pressure that the belt receives from the pulley is very large.
30-100kg in the part which contacts the pulley of the belt
f / cm ² , and a surface pressure of 0.05 to 20 m / s
A degree of slippage has occurred.

[0008] Therefore, heat generation is large, and it is necessary to satisfy a high level of required quality as various physical properties such as heat resistance as well as wear resistance, compression resistance and fatigue resistance. Since a large load is applied to the structure of these belts, it is necessary to improve the dimensional accuracy in order to reduce the stress locally generated in the block. Also, in terms of strength, a block consisting only of resin is not enough, and it is necessary to use a block in which the reinforcing material of the metal insert is coated with resin, and as the resin used for the block, good adhesion to metal is also important. It is becoming.

In such a point, Japanese Patent Publication No. 7-110900
Those using a phenolic resin for such a block,
When a metal reinforcing material is used in the block, sufficient adhesion between the reinforcing material and the resin cannot be obtained, and there is room for further improvement in dimensional accuracy.

[0010] Epoxy resin is a candidate because of its excellent heat resistance, good adhesion to metal and excellent dimensional accuracy. However, the disadvantage of thermosetting resin is that it is fragile, and the large pressure as described above,
Then, it is difficult to satisfy the fatigue resistance of 10 ⁸ cycles or more in a state where the sliding with the pulley occurs.

Accordingly, the present invention is to improve the adhesive strength and dimensional accuracy with a metal reinforcing material and to improve the compressive strength and fatigue resistance of a block by mixing and mixing fibers in an epoxy resin at an appropriate ratio. The purpose is to provide a high-load transmission belt.

[0012]

According to the present invention, in order to achieve the above object, a center belt,
In a high-load transmission belt comprising a plurality of blocks provided at a predetermined pitch in a belt longitudinal direction on the center belt, the blocks are such that a filler composed of carbon fibers and aramid fibers is 20 to 80 parts by weight in 100 parts by weight of an epoxy resin. The compression strength and the fatigue resistance of the block are improved, and a long-life belt can be obtained.

[0013]

FIG. 1 is a perspective view of a high load transmission belt of the present invention, and FIG. 2 is a perspective view of a block main body of the high load transmission belt of the present invention.

The high-load transmission belt 1 of the present invention comprises a center belt 4 having a core 3 spirally embedded in an elastomer 2 and a plurality of blocks 5 fitted and arranged in the longitudinal direction of the center belt 4. Both side surfaces of the block 5 are inclined pulley contact surfaces that engage with the V-grooves of the pulley. The power is transmitted to the pulley.

The block 5 has a fitting groove 8 into which the center belt 4 is fitted. The fitting groove 8 is opened at one of the pair of pulley contact portions 6 and 7, and the opening 9 is opened at a position shifted from the position of the center belt 4. In the example of FIG. 2, a notch in an obliquely upward direction is formed from the end of the fitting groove 8, and when it reaches a position shifted from the fitting groove 8, it extends horizontally to the opening 9.
The opening 9 is located in the fitting groove 8 at a position shifted upward by substantially the thickness of the center belt 4 as compared with the center belt 4.

By shifting the position of the opening 9 from the position of the center belt 4 in this manner, the center belt 4 once attached is prevented from coming off easily. Further, the block 5 has a configuration in which at least a pulley contact surface of the reinforcing member 10 made of metal, which comes into contact with the pulley, is covered with the resin portion 11.

Since the center belt 4 can be inserted into the opening 9 when assembling the high load transmission belt, the belt can be assembled relatively easily. In order to balance the weight of the left and right belts, a block 5 having an opening 9 on the right side and a block 5 having an opening 9 on the left side are mounted on the center belt 4 alternately.

As shown in FIG. 3, the block 5 is provided with a convex portion 12 and a concave portion on the rear surface of the pulley contact portions 6 and 7 at positions substantially at the same height as the core wire 2 of the center belt 4 on the front surface of the block. 13 is provided, and the convex portion 12 and the concave portion 13 are provided.
Are fitted, and the movement of the adjacent blocks is regulated to serve as a guide for aligning the blocks. Further, the convex portion 12 and the concave portion 13 have curved surfaces so that the belt does not wear even when the angle between the adjacent blocks changes due to the bending of the belt.

By fitting the guide portion consisting of the convex portion 12 and the concave portion 13 as described above, the blocks can be aligned in the longitudinal direction of the belt, and when the belt enters the pulley, the block collides with the pulley. It is possible to prevent a collision sound generated due to the operation. Further, by providing the guide portion at the center of the pulley contact portions 6 and 7, the guide portion can be arranged on the pitch line substantially at the same height as the core wire 3 of the center belt 4 on the side of the center belt 4. This is a place where the relative movement of the adjacent blocks is the least, and it can be said that the abrasion of the convex part and the concave part is less than when provided in another place.

The lower half of the pulley abutment portions 6 and 7 near the center in the vertical direction on the front surface of the block 5 has an inclined surface, and when the belt enters the pulley and bends, the front and rear blocks are connected to each other by the front and rear surfaces. So that it does not come in contact with Further, as shown in the cross section in FIG. 4, convex ridges 14 and 15 are formed on the upper surface and the lower surface of the fitting groove 8 so as to mesh with the groove ridges 16 and 17 on the upper and lower surfaces of the center belt 4. It has become.

The materials used as the elastomer 2 constituting the center belt 4 are NR (natural rubber),
HN containing SBR (styrene / butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), hypalone (chlorosulfonated polyethylene), HNBR (hydrogenated nitrile rubber), metal salt of unsaturated carboxylic acid
A rubber compound comprising a single material of rubber such as BR or a blend thereof, a polyurethane resin, and the like.

The core 3 spirally embedded in the elastomer 2 may be a synthetic fiber such as polyamide, polyester, or aramid, or a steel cord.
A cord made of a single inorganic fiber such as a glass fiber cord or a carbon fiber cord, a twisted cord made of a blend of these, and a woven fabric are used.

Further, as shown in FIG. 2, the block 5 is formed by covering the entire surface of a metal reinforcing member 10 with a resin portion 11, and the resin portion 11 contacts at least the pulley. It is necessary to provide a portion corresponding to the pulley contact surface. For example, a material in which only the pulley contact portion of the reinforcing member 10 is covered with the resin portion 11 can be used.

The resin portion 11 covering at least the pulley contact surface of the reinforcing member 10 has a high heat-resistant mechanical strength, an excellent adhesiveness with the metal reinforcing member 10 and a small shrinkage ratio. An epoxy resin having excellent stability is used. Further, a bisphenol type epoxy resin is particularly preferable.

In these resins, carbon fibers and aramid fibers are embedded as a filler. The amount of the carbon fibers and the aramid fibers is 100 parts by weight of the epoxy resin. Is in the range of 20 to 80 parts by weight.

When the amount is less than 20 parts by weight, the block becomes brittle and the fatigue property is deteriorated. For example, sufficient strength cannot be obtained and the durability of the belt decreases, and the friction coefficient of the block increases to increase the belt friction. It is not preferable because the noise during traveling increases. On the other hand, if it exceeds 80 parts by weight, the friction coefficient becomes too low, the slip ratio becomes large and the transmission becomes poor, and the block is thermally degraded due to the heat generated by the slip and the durability of the belt is lowered. Not preferred.

As described above, the epoxy resin is used as the resin portion 11 of the block 5 and the carbon fiber and the aramid fiber are filled therein, whereby heat resistance, abrasion resistance, compression resistance, and fatigue resistance are improved. It is possible to provide a high-load power transmission belt which is excellent, adheres extremely firmly to a metal insert as a core material, and can obtain sufficient performance by filling fibers in terms of resin fragility and slip ratio.

The reinforcing member 10 is a member made of a metal, and examples of the metal include a simple substance such as iron, aluminum, and zinc or an alloy. It can be said that it is most preferable to use an aluminum alloy in order to give sufficient strength to the block and to reduce the weight of the belt.

Further, the present invention is characterized by a resin and a filler forming the block, and the shape of the block is not limited to the above example. For example, slot portions 23 are provided on both side surfaces of the block 22 as shown in FIG.
A belt 21 in which a rubber tension member 24 is inserted into the slot 23, and an upper block 33 and a lower block 34 which are respectively disposed above and below a center belt 32 as shown in FIG. Belt 3 fixed at 35
An excellent belt can be obtained by applying the present application to the shape 1 as well.

[0030]

Next, a test was conducted to measure the friction coefficient, slip rate, abrasion, noise and durability of the block by actually running the belt of the present invention. Examples 1 to 4 are high-load transmission belts of the present invention having the structure shown in FIG. 1, using an epoxy resin as a block configuration, and using carbon fibers and aramid fibers as fillers in a ratio of 50:50. A resin filled with 20 to 80 parts by weight with respect to 100 parts by weight of the epoxy resin was used.

As Comparative Examples 1 and 2, the same structure and the same epoxy resin as those of Examples 1 to 4 were used, and no filler was filled, and the ratio of carbon fiber to aramid fiber was 5%.
0:50 and 10 to 100 parts by weight of epoxy resin
One filled with 0 parts by weight was used.

The test conditions were as follows: the pitch diameter of the driving pulley was 65 mm, the rotation speed was 3200 rpm, the pitch diameter of the driven pulley was 130 mm, the rotation speed was 1600 rpm, the ambient temperature was 100 ° C., and the shaft load was 150 kgf. . In addition, a sound level meter was attached to a position at the center of the belt span for measurement.

The coefficient of friction of each belt block,
The slip ratio at a torque of 4 kgfm, the abrasion after 100 hours of running, the sound pressure during running, and the time to life were measured. Table 1 shows the results of Examples 1 to 5 and Comparative Examples 1 and 2.

[0034]

[Table 1]

As can be seen from Table 1, if the amount of the filler is too small, the fragility and the fatigue of the block are increased. It can be seen that if the amount is too large, the coefficient of friction becomes too low, the transmissivity is reduced, and the durability is reduced due to heat generated by slip.

[0036]

As described above, in the high-load transmission belt of the present invention, in the first aspect, the block is such that the filler composed of carbon fiber and aramid fiber is contained in 100 parts by weight of epoxy resin.
The composition is in the range of 80 parts by weight, and since it uses an epoxy resin, it has good adhesiveness to a metal reinforcing material and high dimensional accuracy. In addition, the use of carbon fiber as a filler has the effect of increasing the mechanical strength of the block and improving wear resistance, and the use of aramid fiber improves wear resistance and prevents noise. The effect can be obtained. Therefore, a high-load transmission belt with improved compressive strength and fatigue resistance of the block can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a high-load transmission belt according to the present invention.

FIG. 2 is a perspective view of a block.

FIG. 3 is a longitudinal sectional view of the high load transmission belt at a fitting groove position.

FIG. 4 is a longitudinal sectional view at the position of a guide convex portion.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a sectional view showing still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 Core 4 Center belt 5 Block 6 Pulley contact part 7 Pulley contact part 8 Fitting groove 9 Opening 10 Reinforcement material 11 Resin material 12 Convex part 13 Concave part

Claims (1)

[Claims] 1. A high-load transmission belt comprising a center belt and a plurality of blocks provided on the center belt at a predetermined pitch in the belt longitudinal direction, wherein the block has a structure in which a metal reinforcing material is covered with a resin portion. The high load transmission belt according to claim 1, wherein the resin part is a mixture of carbon fiber and aramid fiber in a range of 20 to 80 parts by weight in 100 parts by weight of the epoxy resin.