JP2002061716A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tension transmission type high load transmission belt and blocks therefor for reducing deformation after molding the blocks, preventing initial abrasion, having sufficient strength and capable of satisfying a condition required for the high load transmission belt at a high level. SOLUTION: In this high load transmission belt 1 composed of tension belts 3a and 3b and the plural blocks 2 arranged at a prescribed pitch in the lengthwise direction of the tension belts 3a and 3b, the blocks 2 are mainly composed of a material by adding a diallyl phthalate resin, carbon fiber and also a whisker-like reinforcing material, and are constituted so that a fibered reinforcing material becomes 20 to 100 pts.wt. and the whisker-like reinforcing material becomes 5 to 60 pts.wt. to 100 pts.wt. of the diallyl phthalate resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-load transmission belt in which blocks are fixed at a predetermined pitch along a longitudinal direction of a tension band, and to the blocks.

[0002]

2. Description of the Related Art A belt used in a belt-type continuously variable transmission is used by being wound around a speed change pulley that changes the effective diameter of the pulley by changing the V-groove width of the pulley and thereby adjusts the gear ratio. Since the lateral pressure from the pulley increases, the belt must be able to withstand the large lateral pressure. In addition to the use of continuously variable transmission, it is necessary to use a belt capable of withstanding a high load especially for a high load transmission in which the life of a normal rubber belt is too short.

[0003] Among such belts, there is a tension transmission type high load transmission belt in which a block is fixed to a center belt to increase the strength in the width direction of the belt. There is a center belt in which wires are embedded in an elastomer such as rubber, and a block made of an elastomer that is relatively harder than the elastomer used for the center belt is fastened and fixed using a fastening material such as bolts and rivets. .

[0004] The required quality of such a block of a tension transmission type high load transmission belt is that bending friction fatigue, wear resistance, and heat resistance are required because the purpose is to transmit a high load in friction transmission as described above. It is necessary to have properties such as rigidity and impact resistance in a well-balanced manner. It is also important to prevent the pulley from being worn.

As a high-load transmission belt satisfying these requirements, for example, there is a belt disclosed in JP-A-63-34342. This belt uses a double-structured block in which the block and the pulley are in contact with each other using a resin molding material in which a rubber component is added to a phenolic resin component and coated with an insert material made of metal or the like. It is.

Japanese Unexamined Patent Publication (Kokai) No. 7-110900 discloses a high-load power transmission belt designed to satisfy these requirements. The phenolic resin is composed of acrylonitrile-butadiene rubber as a matrix, and two fibers of carbon fiber and aramid fiber are used. A high load transmission belt using a block made of a phenolic resin having a carbon fiber having an onion structure and a crystal layer thickness of 25 to 200 μm by mixing a fiber filling rate of 25 to 60 parts by weight is disclosed. Have been.

[0007]

However, in the case of a phenolic resin, the deformation caused by shrinkage after molding the block is large, and a predetermined V angle (corresponding to the V groove angle of the pulley to be used) is required. It is difficult to obtain, and problems such as large wear at the initial stage of running the belt and noise are generated.

[0008] By the way, recently, due to diversification of needs, although the load is high, the load is slightly lower than in the past.
There is an increasing demand for a high-load transmission belt that can be rotated at high speed.

For example, Japanese Patent Application Laid-Open No. 63-34342 discloses a belt in which an insert material such as an aluminum alloy is embedded in a resin block. However, since an aluminum alloy or the like is used as the insert material, a belt is used. When rotating at a high speed, a large centrifugal force is applied due to its weight, and a large tension acts on the belt, which may cause a problem that the belt is damaged early.

For this purpose, it is advantageous to use a block in which an insert material is not buried, which is important for weight reduction. However, when a block in which an insert material is not buried is used, the above-mentioned problem of deformation after molding is particularly problematic. Becomes noticeable,
Problems such as initial wear and noise become apparent.

In view of the foregoing, the present invention has been made in view of the above-described problems, and has a high load transmission belt capable of reducing the amount of deformation due to shrinkage of a block after molding, thereby reducing noise and extending the durability time. The purpose is to provide. In addition, since it can withstand use at high speed rotation, even if the weight is reduced by omitting the insert material in the block,
It is an object of the present invention to provide a high-load transmission belt having sufficient strength and solving the above-mentioned problems.

[0012]

According to a first aspect of the present invention, there is provided a high-load transmission belt comprising a tension band and a plurality of belts provided at a predetermined pitch along a longitudinal direction of the tension band. High load transmission belt consisting of
The block is characterized in that 20 to 100 parts by weight of carbon fiber is blended with respect to 100 parts by weight of diallyl phthalate resin.

By using a diallyl phthalate resin for the block and adding a fibrous reinforcing material as the reinforcing material, the amount of shrinkage after the block is formed can be made very small. The belt retains its outer shape and can have, for example, a V-angle as designed, so that problems such as abnormal wear and noise in the initial stage of belt running can be prevented, and the belt has excellent durability. can do.

A high-load transmission belt according to a second aspect of the present invention is a high-load transmission belt comprising a tension band and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the tension band. The main component is a diallyl phthalate resin, carbon fiber, and a whisker-like reinforcing material.
00 parts by weight, and the whisker-like reinforcing material is 5 to 60 parts by weight.

By using a diallyl phthalate resin for the block and adding carbon fiber and whisker-like reinforcing materials as reinforcing materials to improve the strength, the insert member can be reduced in size or eliminated. Therefore, the weight of the block can be reduced, and the acting centrifugal force can be reduced.

According to a third aspect of the present invention, the whisker-like reinforcing member according to the second aspect is a zinc oxide whisker.

Since the zinc oxide whisker has a high specific gravity and a high rigidity, the vibration when the block enters the pulley can be reduced, and the belt noise can be reduced. Further, by adding zinc oxide whiskers, the coefficient of friction is stabilized, so that the wear resistance is further improved.

According to a fourth aspect of the present invention, in the high-load transmission belt, the zinc oxide whisker in the third aspect has a three-dimensional shape.

Since the zinc oxide whiskers have a three-dimensional tetrapod shape, the orientation of the carbon fibers is reduced,
The warpage during molding and the anisotropy of molding shrinkage are improved, and the dimensional accuracy is improved.

The high-load transmission belt according to claim 5 is the same as the claim 1, wherein the diallyl phthalate resin
5 to 50 parts by weight of aramid fiber is blended with 0 part by weight and used in combination with carbon fiber.

By adding carbon fiber, hardness can be increased and excellent abrasion resistance can be obtained. In addition, by combining the carbon fiber and the aramid fiber, the hardness, which is the property of the carbon fiber, and the toughness, which is the property of the aramid fiber, are improved. it can.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a high-load transmission belt 1 according to the present invention.
FIG. 3 is a schematic perspective view showing an example of FIG. The high-load transmission belt 1 of the present invention has two tension bands 3a, 3b of the same width, each having a core wire 5 spirally embedded in an elastomer 4, and a predetermined pitch on the upper surface of the tension bands 3a, 3b. And a plurality of blocks 2 fitted and locked and fixed in the concave portion 6 formed by the above. Both sides 2a, 2 of this block 2
b is an inclined surface that engages with the V-groove of the pulley, receives power from the driven pulley, pulls the tension bands 3a, 3b locked and fixed, and drives the power of the driving pulley. To the driven pulley.

As shown in FIG. 1, the block 2 includes a pair of side pillars 1 extending upward from both ends of the beam portion 11.
Lock portions 8, 9 extending from the upper ends of the side pillars 12, 13 toward the center of the block 2 are provided so as to face each other. The beam portion 11, the side pillars 12, 13 and the lock portions 8, 9 form a fitting groove 10 in which the tension bands 3a, 3b fit. The tension bands 3a, 3b are inserted into the fitting grooves 10 through the openings between the lock portions 8, 9, and are mounted. Further, on the fitting groove 10 side of the lock portions 8 and 9, a convex portion 7 is provided, and the convex portion 7 is
Recesses 6 provided at predetermined pitches in tension bands 3a, 3b
Fits. As a result, the tension bands 3a and 3b are in a state in which the tension bands 3a and 3b are hard to be removed from the block 2 after being mounted.

This block 2 comprises diallyl phthalate resin and carbon fiber as main components, and the fibrous reinforcing material is 20 parts by weight based on 100 parts by weight of the diallyl phthalate resin.
-100 parts by weight are added. Or, the main component is a diallyl phthalate resin, carbon fiber, and a whisker-like reinforcing material, and the diallyl phthalate resin 100
20 to 100 parts by weight of the carbon fiber and 5 to 60 parts by weight of the whisker-like reinforcing material with respect to the parts by weight. By adopting such a material configuration, it has sufficient strength such as rigidity and toughness that can sufficiently withstand the side pressure received when it comes into contact with the pulley, has excellent wear resistance, and furthermore, with respect to heat generated during friction. Block can be made strong, and the power received from the pulley can be efficiently transmitted to the tension bands 3a, 3b.
b can be transmitted as a tensile force, and a tensile transmission type high load transmission belt can be configured.

Here, by using a diallyl phthalate resin for the block 2, the block can be injection-molded, and deformation due to shrinkage after molding can be reduced, so that the block can be easily manufactured. In addition, since the V angle of the block can be formed as designed, the problem of abnormal wear and noise of the block in the initial stage of belt running can be prevented. Further, they are excellent in bending stiffness and fatigue strength at high temperature, and these characteristics are further improved by adding carbon fiber described later as a reinforcing material.

As the fibrous reinforcing material serving as the reinforcing material for the diallyl phthalate resin, it is preferable to use carbon fiber alone or a combination of carbon fiber and aramid fiber. The carbon fiber is preferably used in an amount of 20 to 100 parts by weight based on 100 parts by weight of the diallyl phthalate resin. If the carbon fiber content is less than 20 parts by weight, the reinforcing property is insufficient, and the strength of the block 2 is insufficient. On the other hand, if it exceeds 100 parts by weight, the hardness is increased, but the toughness is reduced, the bending fatigue resistance and the impact resistance are reduced, and the noise generated at the time of contact with the pulley is increased. When a whisker-like reinforcing material described later is added to the carbon fiber, a block having sufficient strength or the like can be obtained by using only the carbon fiber.
By adding 5 to 50 parts by weight to 0 parts by weight, the toughness of the block is improved, and the wear resistance and impact resistance can be further improved. In this case, the amount of aramid fiber added is 5
When the amount is less than the weight part, the effect of adding the aramid fiber is not sufficiently exhibited. If it exceeds 50 parts by weight,
It becomes difficult to knead.

Here, the carbon fiber used may be any of commonly used rayon type, pitch type and PAN type, but is compatible with diallyl phthalate resin.
In particular, it is preferable to use a PAN-based carbon fiber that is compatible with 4.6 nylon. The length of the carbon fiber used is 1 to
5 mm is preferred. If it is less than 1 mm, the reinforcement of the block is not sufficient, and if it exceeds 5 mm,
It is not preferable because kneading with the resin becomes difficult and the kneading becomes shorter during kneading.

As the whisker-like reinforcing material to be added together with the fibrous reinforcing material, it is preferable to use zinc oxide whiskers. The zinc oxide whisker has a three-dimensional shape in which hands extend in four directions like a tetrapod. This zinc oxide whisker alone is excellent in heat resistance and abrasion resistance, but has a tetrapod-like three-dimensional shape as described above. Is suppressed, and the anisotropy of warpage and molding shrinkage during molding is improved. Further, since the orientation of the carbon fibers can be reduced in this way, the anisotropy in strength such as the toughness and bending stiffness of the block 2 can be reduced, and the friction coefficient is stabilized, so that the wear resistance is improved. I do. In addition, since the zinc oxide whisker has a high specific gravity and a high rigidity, vibration at the time of contact with the pulley can be reduced, and generation of noise can be reduced. When the amount of the zinc oxide whisker is less than 5 parts by weight with respect to 100 parts by weight of the thermoplastic resin, the effect of the addition is not exhibited, and
If it is added in excess of 0 parts by weight, kneading cannot be carried out and molding becomes difficult.

In addition to these, molybdenum disulfide,
The lubricity of the block 2 can also be improved by mixing at least one selected from graphite and a fluorine-based resin. Examples of the fluorine-based resin include polytetrafluoroethylene (PTFE), polyfluoroethylene propylene ether (PFPE), tetrafluoroethylene hexafluoropropylene copolymer (PFEP), and polyfluoroalkoxyethylene (PFA). .

As described above, the tension bands 3a and 3b have the recesses 6 formed at a predetermined pitch on the upper surface, that is, on the surface of the block 2 that contacts the lock portions 8 and 9. The convex portions 7 provided on the lock portions 8 and 9 of the block 2 are fitted into the concave portions 6.

The elastomer 4 used for the tension bands 3a and 3b may be a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber, hydrogenated nitrile rubber, or a rubber or polyurethane appropriately blended with them. Rubber and the like. As the cord 5, a rope selected from polyester fiber, polyamide fiber, aramid fiber, glass fiber, steel wire and the like is used. In addition to the core wire 5 having a rope embedded in a spiral shape, a woven fabric, a knitted fabric, a metal thin plate, or the like made of the above fibers can be used.

In this embodiment, the two tension bands 3
Although the description has been given of the case where the fitting groove 10 is mounted in the fitting groove 10 of the block 2 using a and 3b, a single tension band may be separately used.

In the above description, a block having no insert material inside the block has been described. Deformation after molding of the block is a problem that is noticeable in blocks without insert material,
The effect of using the diallyl phthalate resin is large, but even if the block has an insert material, the present invention is not limited to deformation, so the present invention is also effective for a belt using a block having an insert material. It is. As the insert material, one made of an aluminum alloy or the like is used.

As another embodiment, there is a high-load transmission belt 20 as shown in FIG.

In this case, fitting grooves for inserting the tension bands 21 and 22 are opened on both side surfaces of the block 23, and the tension bands 21 and 22 are fitted into the fitting grooves, respectively. The block used for the high-load transmission belt according to the present invention is not limited to the form shown in the present embodiment.

[0037]

Next, a high-load transmission belt of the present invention was manufactured in the following configuration, and the deformation rate of the block was measured, and a durability test and a noise test of the belt were performed to measure the wear amount on the side surface of the block. did.

The high load transmission belt used is shown in FIG.
Examples 1 to 3 were obtained by changing the material mixing ratio of the block as shown in Table 1.
3. High load transmission belts of Comparative Examples 1 to 7. The tension bands 3a and 3b used were all common, and the core wire 5 used aramid fiber, and the elastomer 4 used chloroprene rubber. Belt pitch width is 18mm, pitch circumference is 831
mm and the block pitch is 3 mm.

Example 1 Diallyl phthalate resin 10
0 parts by weight, 40 parts by weight of carbon fiber, graphite 1
2 parts by weight were blended and molded into a block 2 having the shape shown in FIG. 1 by injection molding. The two tension bands 3a and 3b described above were fitted to the block 2 to produce a high-load transmission belt for testing.

Example 2 Diallyl phthalate resin 10
A high-load transmission belt for testing was produced in the same manner as in Example 1, except that 50 parts by weight of carbon fiber, 30 parts by weight of zinc oxide whiskers, and 12 parts by weight of graphite were used with respect to 0 parts by weight.

Example 3 Diallyl phthalate resin 10
A high-load transmission belt for testing was produced in the same manner as in Example 1, except that 40 parts by weight of carbon fibers, 20 parts by weight of zinc oxide whiskers, 15 parts by weight of aramid fibers, and 12 parts by weight of graphite were added to 0 parts by weight. .

(Comparative Example 1) A high load transmission for a test was performed in the same manner as in Example 1 except that 40 parts by weight of carbon fiber, 20 parts by weight of zinc oxide whiskers, and 12 parts by weight of graphite were used with respect to 100 parts by weight of a phenol resin. Created a belt.

Comparative Example 2 Diallyl phthalate resin 10
A high-load transmission belt for testing was produced in the same manner as in Example 1 except that carbon fiber was 15 parts by weight, zinc oxide whiskers were 20 parts by weight, and graphite was 12 parts by weight based on 0 parts by weight.

Comparative Example 3 Diallyl phthalate resin 10
With the exception of 110 parts by weight of carbon fiber, 20 parts by weight of zinc oxide whiskers, and 12 parts by weight of graphite with respect to 0 parts by weight.
In the same manner as in Example 1, a test high-load transmission belt was manufactured.

Comparative Example 4 Diallyl phthalate resin 10
A high load transmission belt for testing was prepared in the same manner as in Example 1 except that 60 parts by weight of carbon fiber, 4 parts by weight of zinc oxide whiskers, and 12 parts by weight of graphite were used with respect to 0 parts by weight.

Comparative Example 5 Diallyl phthalate resin 10
A high load transmission belt for testing was produced in the same manner as in Example 1 except that 50 parts by weight of carbon fiber, 70 parts by weight of zinc oxide whiskers, and 12 parts by weight of graphite were used with respect to 0 parts by weight.

Comparative Example 6 Diallyl phthalate resin 10
0 parts by weight, 50 parts by weight of carbon fiber, 4 parts of aramid fiber
A high-load power transmission belt for testing was prepared in the same manner as in Example 1 except that the weight parts were used.

Comparative Example 7 Diallyl phthalate resin 10
0 parts by weight, 40 parts by weight of carbon fiber, 6 parts of aramid fiber
A high load transmission belt for testing was produced in the same manner as in Example 1 except that 0 parts by weight and 12 parts by weight of graphite were used.

The deformation ratio (%) of the block of the high-load transmission belt 48 hours after molding was measured by using a projector.

As a durability test of the high-load transmission belt, the belt was wound around a driving pulley having a diameter of 60 mm and a driven pulley having a diameter of 120 mm, and the rotation speed of the driving pulley was 3000.
rpm, the driven pulley rotation speed was 1500 rpm, the input torque was 59.2 N, the shaft load was 3432 N, and the belt was run at an ambient temperature of 90 ° C. when the belt was running.

In the noise test, the belt was run under the same pulley layout as the endurance test under the same conditions of the number of rotations and the axial load, and the total noise level was measured at a predetermined position by a sound level meter.

The amount of wear on the side surface of the block is determined by the belt running 10
The block was removed from the belt after 0 hour, and the measurement was performed using a projector. The above results are summarized in Table 1.

[0053]

[Table 1]

As can be seen from Table 1, the belt of Example 1 has a long running time and a small amount of wear. The belt of Example 2 in which 10 parts by weight of zinc oxide whiskers were blended with this belt had further improved wear and durability and reduced noise compared to the belt of Example 1. The belt of Example 3 in which 8 parts by weight of aramid fiber was blended with the belt of Example 2 has a longer durability time, the amount of wear is even smaller than that of the belt of Example 2, and the noise is better than the others. I have.

The belt of Comparative Example 1 made of a phenolic resin has a large deformation rate of the block, resulting in a large abrasion at the beginning of the belt running and a large noise. Further, the belt of Comparative Example 2 having a small amount of carbon fiber is:
Since the strength did not sufficiently increase, the block was compressed and fractured in a short time, and the wear amount was not measured because a failure occurred before the measured traveling time was reached. Conversely, the belt of Comparative Example 3 containing a large amount of carbon fibers had a high hardness, but the toughness was reduced by that amount, so that cracks occurred in the blocks after running for 133 hours. In addition, the noise was also loudest.

Further, Comparative Examples 4 and 5 fall within the scope of the examples as claim 1, but the whisker-like reinforcing material is not used.
This is a comparative example with respect to Example 2 of Claim 2 in which 〜60 parts by weight are mixed. In the belt of Comparative Example 4 having less zinc oxide whiskers, the anisotropy due to the orientation of the carbon fibers was not sufficiently improved, so that despite the mixing of zinc oxide whiskers, the durability time was longer than that of Example 2. No wear resistance was improved, and the amount of wear increased. On the other hand, the belt of Comparative Example 5 containing many zinc oxide whiskers could not be kneaded, and could not be subjected to a test such as a durability test.

As a comparative example of Example 3, among the belts of Comparative Examples 6 and 7 in which aramid fibers were blended, the belt of Comparative Example 6 in which 4 parts by weight of aramid fibers were blended had a small amount of the aramid fibers. The effect obtained by blending the aramid fiber was not exhibited, and the characteristics were substantially the same as those of the belt of Example 2. Further, the belt of Comparative Example 7 containing a large amount of aramid fiber as much as 60 parts by weight could not be kneaded, and tests such as a durability test could not be performed.

[0058]

The present invention is configured as described above.
According to the first or second aspect of the present invention, since the diallyl phthalate resin is used for the block, the amount of shrinkage after molding the block can be made very small, so that the outer shape when molded with a mold is used. And, for example, a V angle as designed can be provided, so that problems such as abnormal wear and noise in the initial stage of running of the belt can be prevented, and the durability of the belt can be improved. .

Further, since a fiber-like reinforcing material and a whisker-like reinforcing material are added as the reinforcing material to improve the strength, the weight of the block can be reduced and the acting centrifugal force can be reduced. It is possible to efficiently transmit the power of the driving pulley to the driven pulley even if the motor is used at a high rotation speed.
Since all are made of blocks mainly composed of resin, it can be operated without oil even during operation. In addition, injection molding becomes possible, the block can be easily manufactured, and the resin is made of a resin having sufficient strength even at a high temperature, so that it has an effect that it can be sufficiently applied to automobiles, agricultural equipment, and the like.

According to the third aspect of the present invention, since the zinc oxide whisker has a high specific gravity and a high rigidity, the vibration when the block enters the pulley can be reduced, and the belt noise can be reduced. In addition, the addition of zinc oxide whiskers stabilizes the friction coefficient, and thus has the effect of further improving wear resistance.

According to the fourth aspect of the present invention, since the zinc oxide whiskers have a three-dimensional tetrapod shape, the orientation of carbon fibers is reduced, and the anisotropy of warpage and molding shrinkage during molding is reduced. Is improved, and the effect of improving the dimensional accuracy is exhibited.

According to the fifth aspect of the present invention, since carbon fibers are added, the hardness increases and the wear resistance can be improved. In addition, by combining carbon fibers and aramid fibers, hardness which is a property of carbon fibers,
The toughness, which is a property of the aramid fiber, is improved, and it has an effect of being excellent in abrasion resistance and impact resistance.

[Brief description of the drawings]

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

FIG. 2 is a schematic perspective view showing another example of the high-load transmission belt according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Block 3a, 3b Tension band 4 Elastomer 5 Core wire 6 Concave portion 7 Convex portion 8, 9 Lock section 10 Fitting groove 11 Beam section 12, 13 Side pillar 20 High load transmission belt 21 Tension band

Claims (5)

[Claims] 1. A high-load transmission belt comprising a tension band and a plurality of blocks provided at a predetermined pitch along the longitudinal direction of the tension band, wherein the block comprises carbon fiber and 100 parts by weight of diallyl phthalate resin. A high-load transmission belt characterized in that 20 to 100 parts by weight are blended. 2. A high-load transmission belt comprising a tension band and a plurality of blocks provided at a predetermined pitch along a longitudinal direction of the tension band, wherein the block includes a diallyl phthalate resin, carbon fibers, and a whisker-like resin. A high-load transmission belt comprising a reinforcing material as a main component, and the fibrous reinforcing material is 20 to 100 parts by weight and the whisker-like reinforcing material is 5 to 60 parts by weight, based on 100 parts by weight of diallyl phthalate resin. 3. The high-load transmission belt according to claim 2, wherein the whisker-like reinforcing material is a zinc oxide whisker. 4. The high-load transmission belt according to claim 3, wherein the zinc oxide whiskers have a three-dimensional shape. 5. An aramid fiber is compounded in an amount of 5 to 50 parts by weight based on 100 parts by weight of diallyl phthalate resin.
A high-load transmission belt according to any one of claims 1 to 4.