JPH07280039A - Heavy load transmission belt - Google Patents

Abstract

PURPOSE:To provide a heavy load transmission belt where the working man- hour is small, and the bending fatigue resistance, the heat resistance, the rigidity, and the shock resistance are excellent. CONSTITUTION:In a heavy load transmission belt 1 where upper and lower blocks 7, 8 are fixed to a center belt 5 by stopping members 9, 4, 6 nylon reinforced with 15-40wt.% carbon fiber is used as the material of the upper and lower blocks 7, 8. This constitution obtains the belt of long service life, and reduces the wear.

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 and fixed at a predetermined pitch along the longitudinal direction of a center belt.

[0002]

2. Description of the Related Art A belt used in a belt type continuously variable transmission is used by being wound around a variable speed pulley in which the effective groove diameter of the pulley is changed by changing the V groove width of the pulley to adjust the gear ratio. However, since the lateral pressure from the pulley increases, the belt must withstand the large lateral pressure. In addition to the use of continuously variable transmission, it is necessary to use a belt that can withstand a particularly high load in a high load transmission application in which a normal rubber belt has a too short life.

Among such belts, there is a belt in which a block is fixed to a center belt to enhance the strength in the belt width direction. As a concrete constitution, the core wire is made of an elastomer such as rubber. There is one in which a block made of an elastomer that is relatively harder than the elastomer used for the center belt is fixed to the center belt embedded in by using a fastening material such as bolts and rivets.

As for the required quality of the block, since it is intended for high load transmission in frictional transmission as described above, it is necessary to maintain a good balance of properties such as bending fatigue resistance, wear resistance, heat resistance, rigidity and impact resistance. is there. It is also an important factor to prevent the pulley from wearing out.

In order to satisfy these required qualities, a woven fabric made of, for example, carbon fiber or glass fiber, coated with a heat-resistant resin or heat-resistant rubber, has been wound up in a roll shape and pressed. What was pressed and formed was used.

[0006]

However, the biggest drawback of using the block having such a structure is that the number of processing steps is increased, which inevitably increases the cost.

On the other hand, materials that can reduce the number of processing steps and have a great cost advantage, such as 6 nylon, 6
6 Thermoplastic resin such as nylon, epoxy resin, phenolic resin, unsaturated polyester resin, polyimide resin and other thermosetting resin can be used to manufacture blocks by injection molding, so processing is relatively little and cost is reduced. However, 6-nylon and 6.6-nylon have drawbacks in heat resistance, while epoxy resins such as phenol resin are inferior in bending fatigue and impact resistance. However, the properties such as abrasion resistance, heat resistance, rigidity and impact resistance could not be satisfied in a well-balanced manner. In addition, there is a problem that the pulley is worn out early when traveling around the pulley.

The present invention can solve the above problems and reduce the number of processing steps for making a block, and at the same time, can achieve required qualities such as bending fatigue resistance, wear resistance, heat resistance, rigidity and impact resistance. The purpose is to provide a high load transmission belt that can be satisfied.

[0009]

In order to achieve such an object, the present invention has a center belt in which a core body is embedded in an elastomer and at least one side of which has a ridge portion at a predetermined pitch, and the center belt. A high-load transmission belt consisting of a fastening block and a fastening block, and a lower block, wherein the upper and lower blocks are made of 4.6 nylon reinforced with 15 to 40 wt% of carbon fiber. .

[0010]

In the present invention, 4.6 nylon reinforced with 15 to 40 wt% of carbon fiber is used as the material of the block used for the high load transmission belt, but 4.6 nylon can be molded by injection. Since it is possible and easy to process, it has the bending fatigue resistance and impact resistance which are the advantages of thermoplastic resins, and it has excellent heat resistance, which is a drawback of general thermoplastic resins, so it can be used for high load transmission. It is possible to obtain a block in which the characteristics required for the belt block are maintained in a well-balanced manner.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view of a main portion of a high load transmission belt of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.

In the high load transmission belt 1 of the present invention, a rope-shaped core body 2 is embedded in an elastomer 3 made of rubber or the like in a spiral shape, and a center belt 5 having convex ridge portions 4 at a predetermined pitch on its lower surface. The lower block 7 having the concave streak portion 6 fitted to the convex streak portion 4 is fitted to the side having the convex streak portion 4,
The upper block 8 is arranged on the upper surface side of the center belt 5 at a position corresponding to the lower block 7, and a rivet, a bolt, or the like is fixed to a through hole provided through the upper block 8, the center belt 5, and the lower block 7. Through the material 9, each is fixedly fixed.

What is used as the elastomer 3 of the center belt 5 is a single material such as chloroprene rubber, natural rubber, nitrile rubber, styrene-butadiene rubber or hydrogenated nitrile rubber, or a rubber or polyurethane rubber in which these are appropriately blended. Is mentioned. As the core body 2, a rope selected from polyester fiber, polyamide fiber, aramid fiber, glass fiber, steel wire, etc. is used. Further, as the core body 2, other than the one in which the rope is embedded in a spiral shape, a woven cloth, a knitted cloth, a metal thin plate or the like of the above fibers can be used.

Further, as shown in FIG. 3, the center belt 5 may be provided with a convex strip portion 10 on the upper surface thereof, and the upper block 8 may be provided with a concave strip portion 11 so that both of them are fitted together.
As shown in FIG. 4, the elastomer 3 on the upper surface of the center belt 5
It is also possible to use a structure having a low hardness as a and to provide the upper block 8 with the protrusions 12 and the like so that the protrusions 12 of the upper block 8 bite into the elastomer 3a of the center belt 5. By doing so, the fixing strength of the upper block 8 to the center belt 5 is increased, and particularly the strength against the shearing force in the belt longitudinal direction can be increased.

The fastening and fixing method is not limited to fixing with fastening materials 9 such as rivets and bolts, and as shown in FIG. 5, grooves 13, 14 are formed on the side surface of the block and the upper surface of the upper block 8 and the lower surface of the lower block 7. For example, it may be provided and fixed by winding and fastening with a fastening material 15 made of a metal belt-shaped member.
The upper and lower blocks 8 and 7 used are 4.6 nylon reinforced with carbon fiber, and the carbon fiber has a diameter of about 7 μmφ and a length of about 6 mm.
-Normally, a material that has been surface-treated so that it can be bonded to 6 nylon is used. The 4.6 nylon used in the present invention means polytetramethylene adipamide.

The blending amount of carbon fiber is 15 to 40 wt.
%, If it is less than 15 wt%, the reinforcing property is insufficient and the strength of the block is insufficient, and if it exceeds 40 wt%, the block becomes brittle even if the toughness is lost, and bending fatigue resistance and impact resistance decrease. Not preferable.

Although 4.6 nylon is used as the matrix resin for forming the block, by doing so, the molding by injection becomes possible and the number of manufacturing steps of the block becomes small, so that the manufacturing cost can be reduced. Then, by reinforcing the carbon fiber as described above, it is possible to obtain a block having a well-balanced characteristic such as bending fatigue resistance, abrasion resistance, heat resistance, and impact resistance required as a block for a high load transmission belt. You can Further, the high load transmission belt of the present invention has a small amount of abrasion of the pulley when the belt is hung on the pulley for traveling, so that it is possible to avoid causing the unstable running due to abrasion of the pulley. Less replacement is required.

A test example for confirming a difference in durability time of the high load transmission belt 1 having different block materials and a change in durability time due to a change in the number of blended parts of carbon fiber will be shown below. First, a test of a type of belt in which the upper and lower blocks 8 and 7 and the center belt 5 are fixed and fixed by rivets will be shown.

The center belts 5 of the belts used are all common, the core wire is made of aramid fiber, and the elastomer is made of chloroprene rubber. The upper and lower blocks 7, 8 are fixed to the center belt 5 by the center belt 5. Protrusions 4 are provided on the lower surface of the base plate at a predetermined pitch, and the recesses 6 of the lower block 7
And the center belt 5 has a hardness of 60 ° on the upper surface.
(JIS A) rubber is arranged so that the protrusions 12 of the upper block 8 bite into the elastomer on the upper surface of the center belt 5, and they are fixed and fixed by rivets. The driving conditions are as follows: the driving pulley diameter is 160 mm, the driven pulley diameter is 116 mm, and the drive shaft rotation speed is 1400 r.
The driving horsepower was 18 ps.

Table 1 shows the number of compounding parts of the block material and the carbon fiber of each test sample, the durability time, and the failure phenomenon.
And shown in Table 2. In addition, Examples 1-4 and Comparative Examples 1-4,
Blocks 7 to 9 are obtained by embedding short fibers in the width direction in a matrix resin, and Comparative Examples 5 and 6 are obtained by coating a woven cloth with the matrix resin, winding the same in a roll shape, and pressing with pressure. Are using blocks.

[0021]

[Table 1]

[0022]

[Table 2]

From Table 1, it is shown that Comparative Examples 1 and 2 are shorter in durability time than Examples 1 to 4 and that the content of the carbon fiber is in the preferable range of 15 to 40 wt%. There is. In Comparative Examples 3 and 4, the short fibers mixed in the block are glass fibers, but the durability time is very short as compared with the examples in which the carbon fibers are mixed. Comparative Examples 5 and 6 use a block in which a conventional woven fabric coated with a matrix resin is wound into a roll and pressure-pressed, and the belt is excellent in durability although it takes time and effort to manufacture. It can be seen that the example shows the same durability as the comparative examples 5 and 6.

Comparative Examples 7 to 9 have the same conditions as in Example 3 except that the matrix resin is polyimide resin, epoxy resin, or 6.6 nylon, but the durability time is 1 compared with Example 3. It is / 4 or less, and it can be seen that the durability is increased by using 4.6 nylon.

Next, a test of a belt of a type in which the upper and lower blocks 8 and 7 and the center belt 5 are fastened and fixed by winding and fastening them with a metal belt-shaped member will be shown. The center belts 5 of the belts used are all common, the core wire is aramid fiber, the elastomer is chloroprene rubber,
The upper and lower blocks 7 and 8 are fixed to the center belt 5 by providing the protrusions 4 on the lower surface of the center belt 5 at a predetermined pitch.
The center block 5 is fitted with the recess 6 of the lower block 7, and rubber having a hardness of 60 ° (JIS A) is arranged on the upper face of the center belt 5 so that the unevenness of the upper block 8 is cut into the elastomer on the upper face of the center belt 5. A metal band-shaped member is wound around and fastened and fixed. The running condition is that the driving pulley diameter is 160 mm and the driven pulley diameter is 11 mm.
The driving speed was 6 mm, the rotational speed of the drive shaft was 1400 rpm, and the driving horsepower was 18 ps.

Table 3 shows the number of compounding parts of the block material and carbon fiber of each test sample, the durability time, and the failure phenomenon.
Shown in. Examples 5 to 8 use blocks in which short fibers in the width direction are embedded in a matrix resin.

[0027]

[Table 3]

As shown in Table 2, the upper and lower blocks 8 and 7
A belt in which the center belt 5 and the center belt 5 are wound and fastened and fixed by a metal belt-like member is inferior in durability as a whole to a belt fastened and fixed by a rivet, but a block using another resin reinforced with carbon fiber. It can be seen that the durability is obviously superior to the belts using Comparative Example 7 (Comparative Examples 7 and 8 in Table 2) even if the number of parts of the reinforcing material is the same.

Further, an experiment was conducted on how much the high load transmission belt of the present invention wears the pulley. As a sample, a resin material containing the same reinforcing material as the block used in the belt of Example 3 and the belt of Comparative Example 6 was used as a cylindrical test piece of 8 mmφ,
Friction and wear tester (TRI-S-500 manufactured by Takachiho Seiki Co., Ltd.)
N). The wear amount and friction coefficient of the block and the average roughness on the friction surface of the mating material after 5 hours were measured under various surface pressure conditions. The results are shown in Table 4.

[0030]

[Table 4]

As can be seen from Table 4, as compared with the belt of Comparative Example 6, the belt of the present invention has a smaller average roughness of the surface of the mating member under any surface pressure condition, and the pulley is worn. I find it difficult. Further, the amount of wear of the block and the friction coefficient are smaller in the third embodiment, and it is understood that not only the pulley but also the block is less worn. From Table 1, it can be seen that the belt of Comparative Example 6 has the best durability among Comparative Examples, but the belt of the present invention has a well-balanced performance in consideration of how the mating material is not worn. It turns out that

[0032]

As described above, the high load transmission belt of the present invention uses 4.6 nylon reinforced with 15 to 40 wt% of carbon fiber for the block, and the block can be molded by injection, and the number of processing steps is small. Is small and the manufacturing cost is low, and it has a well-balanced property such as bending fatigue resistance, wear resistance, heat resistance, and impact resistance, so that a belt with a long life can be obtained and wear of the pulley is also small. Therefore, a belt driving device having a long life can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a high load transmission belt according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a sectional view corresponding to FIG. 1 according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view corresponding to FIG. 1 according to still another embodiment of the present invention.

FIG. 5 is a sectional view corresponding to FIG. 2 according to still another embodiment of the present invention.

[Explanation of symbols]

 1 High-load transmission belt 2 Core body 3 Elastomer 3a Elastomer 4 Convex section 5 Center belt 6 Recessed section 7 Lower block 8 Upper block 9 Fastening material 10 Convex section 11 Recessed section 12 Convex section

Claims (4)

[Claims] 1. A center belt having a core body embedded in an elastomer and having ridges on at least one side thereof at a predetermined pitch, and a center block fixed to the center belt with a fastening material and having a lower block. In the load transmission belt, the upper and lower blocks are reinforced with carbon fiber 4.6.
High load transmission belt characterized by being made of nylon. 2. The blending ratio of carbon fiber in the block is 1
The high load transmission belt according to claim 1, which is 5 to 40 wt%. 3. The high load transmission belt according to claim 1, wherein the fastening material is a rivet. 4. The fastening material is a metal strip-shaped member.
Alternatively, the high-load transmission belt described in 2.