JP2001208138A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises during running of a belt by disposing a metal band to remarkably reduce abrasion between a block and an endless carrier in a sliding surface of both members, lengthen the life of the belt, and by preventing backlash due to abrasion of the block. SOLUTION: In this high load transmission belt 1 used in a dry type continuously variable transmission, the metal band 13 is interposed between the endless carrier 2 and the block 3, and the peripheral length of the metal band 13 is made longer than the inner peripheral surface of the endless carrier by 0.1 to 0.3%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt used for continuously driving a belt of a main drive or an auxiliary machine of an automobile or an agricultural machine. It relates to the belt to be provided.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Sho 55-100 discloses a belt used for applications requiring high load transmission, such as a continuously variable transmission.
No. 443 discloses a compression-transmission-type metal belt in which a block slides on a metal band. The metal belt is excellent in lateral pressure resistance and can withstand considerable high lateral pressure, so it is not easily buckled and deformed, and because it is a compression transmission, there is no need to lock the block by meshing it with the metal band Therefore, the pitch can be reduced by reducing the thickness of the block, so that it can be said that the belt can reduce unpleasant noise when the belt runs.

However, in the case of this type of belt, since the entire belt is made of metal and used by being wrapped around a metal pulley, oil for lubrication must always be supplied during belt running. However, the transmission as a whole had to be large.

Further, the present inventors have disclosed in Japanese Patent Application No. 9-15802.
Supply of oil etc. by arranging slidable resin in the part that contacts the pulley of the block, the part that contacts the endless carrier, the part that contacts the blocks, and the part that contacts the block of the endless carrier in No. 8, etc. Proposes a dry-type compression power transmission belt that does not require a belt.

[0005]

However, the resin material is more liable to be worn by friction and impact than metal. Particularly, in the groove for engaging the endless carrier of the block, the sliding between the endless carrier and the block causes the sliding. The surface will be significantly worn. As a result, rattling occurs between the endless carrier and the block, and the rattling gradually increases, causing noise and adversely affecting running performance and reliability. And the tendency to generate abrasion was remarkable on the inner peripheral surface side of the endless carrier.

In view of the above, the present invention provides a dry compression transmission belt using a resin material, which is less worn due to sliding between the block and the endless carrier even when high-speed rotation is continued for a long time under a high load, and the backlash of the belt is reduced. It is an object of the present invention to provide a high-load transmission belt with low running noise and high running performance and high reliability.

[0007]

According to the present invention, in order to achieve the above object, in the first aspect, the engaging grooves of the plurality of blocks are engaged with the endless carrier so as to be slidable in the longitudinal direction. In the high load transmission belt in which the sliding surface of the block is made of resin, a metal band is interposed between the inner peripheral surface of the endless carrier and the lower surface of the engagement groove of the block, and the peripheral length of the metal band is It is characterized in that it is 0.1 to 0.3% longer than the peripheral length of the inner peripheral surface of the endless carrier.

[0008] By arranging such a metal band, on the surface that slides between the block and the endless carrier,
Since the abrasion of both can be greatly reduced, the backlash between the block and the endless carrier is small, the performance of the belt can be improved, and the life of the belt can be extended.

In the present invention, a metal band is interposed between the outer peripheral surface of the endless carrier and the upper surface of the engagement groove of the block.

By arranging the metal band not only on the inner side but also on the outer side of the endless carrier, wear of the endless carrier and the block on the outer side of the endless carrier can be prevented. Performance and life can be extended.

[0011]

1 is a sectional view of a high-load transmission belt according to the present invention, and FIG. 2 is a side view of a block.

The high-load transmission belt 1 of the present invention allows a large number of blocks 3 to slide on the endless carrier 2 at least in the longitudinal direction of the belt in a state where the engagement grooves 4 of the blocks 3 are engaged with the endless carrier 2. This is a locked belt, and when it runs around the pulley, the block is moved by the drive pulley, the block in front of the moved block in the belt traveling direction is pushed, and the next block is pushed,
This is a compression transmission type belt that transmits power by rotating a driven pulley by moving a block around the entire circumference of the belt.

The block 3 used in the high-load transmission belt 1 of the present invention is not particularly limited as long as it can be basically used in a compression transmission system.
As an example of the shape, in the example shown in FIG. 1, it is composed of two belt side portions 5 and a connecting member 6 connecting them at a lower end, and a shape having locking portions 7 at the upper end of the belt side portion 5. It has become. In addition, an inclined surface T is provided on the inner peripheral side of a surface of the block corresponding to the front in the running direction of the belt 1 so that the belt can be wound around the pulley and bent.
The inclined surface 8 is not limited to the entire surface of the block, but may be the rear surface or the front and rear surfaces.

An endless carrier 2 is provided between the locking portions 7 and 7.
The endless carrier 2 and the block 3 are prevented from being detached by the locking portion 7 in a state where the two endless carriers 2 and 2 are inserted.

Further, a convex portion 9 and a concave portion 10 are provided on the front and rear surfaces of the belt side portion 5, respectively. The convex portion 9 and the concave portion 10 are fitted between the front and rear blocks 3, so that the block 3 is moved by the belt. Among them, they are arranged.

As another example of the block shape, as shown in FIG. 3, an E-shaped block 3 composed of two width direction members 20, 20 and a connecting member 21 connecting them at the center may be used. In this case, grooves 4 for engaging the endless carrier 2 are formed on both side surfaces of the block 3. And
The belt is a belt in which the block 3 is slidably locked on the pair of endless carriers 2, 2.

The block 3 may be made of a block made of a metal such as duralumin, iron, or titanium, or a highly rigid core 1 made of a metal, a fiber-reinforced resin, or the like.
0 is coated with a resin layer 12. By coating the resin layer 12, unlike a conventional belt made entirely of metal, a dry type continuously variable transmission system that can run without continuously supplying a large amount of oil can be provided.

In the belt according to the present invention, since the power is transmitted by friction between the block and the pulley, a portion of the block that contacts the pulley needs a certain coefficient of friction. .

Therefore, it is preferable to use a material in which the resin constituting the resin layer 12 is filled with 30 to 50 parts by weight of carbon fiber as a reinforcing material with respect to 100 parts by weight of epoxy or phenol resin. A material having an appropriate coefficient of friction can be obtained by the quantitative mixing. If the compounding amount of the carbon fiber is less than 30 parts by weight, the amount of wear of the resin due to friction with the pulley increases, and if it exceeds 50 parts by weight, the material itself is too hard and brittle, resulting in poor impact resistance. It is not preferable because the noise during the running of the belt becomes a harsh high-frequency metal sound.

Next, as the endless carrier 2, there can be used a band made of a resin, a resin band reinforced with a cord, a woven fabric or a knitted fabric, or the like.

The materials that can be used as the resin material of the endless carrier 2 include aromatic polyamide resin, aromatic polyimide resin, aromatic polyamideimide resin, aromatic polyester resin, polyetheretherketone resin, polyethersulfide resin, and polyphenylene. Examples include sulfide resin, polyethylene terephthalate resin, fluorine resin, silicon resin, polycarbonate resin, phenol resin, epoxy resin, polyimide resin, polyamideimide resin, and the like.

When the endless carrier 2 is reinforced with a cord, a woven cloth (such as a seamless woven cloth) or a knitted cloth, the fiber material may be polyester fiber, polyamide fiber, liquid crystal polymer, polyimide fiber, polyamide imide fiber, A phenylene-2,6-benzobisoxazole (PBO) fiber or the like can be used, and a resin in which a fiber material such as a knitted cloth is embedded in a resin can be used. By doing so, the dimensional stability, bending fatigue resistance, and tear resistance of the endless carrier 2 in the longitudinal direction can be improved. Obtainable. In addition, embedding the fiber material in the resin here means not only a state in which the fiber material is completely hidden in the resin, but also a resin material in which the fiber material is partially exposed. Some of them are more suitable to be described as coated.

Among the fibrous materials embedded in the resin, the knitted fabric may be an ordinary knitted fabric, but a more preferred example is an inlay knitted fabric. An inlay knitted fabric is a structure in which linear reinforcing fibers are woven into a normal knitted fabric, and in the direction parallel to the reinforcing fibers, there is little elasticity and excellent dimensional stability and tear resistance. Show properties.
By aligning the reinforcing fibers in the longitudinal direction of the endless carrier 2, the strength in the longitudinal direction of the endless carrier 2 can be increased, and dimensional stability and tear resistance can be improved.

The above-mentioned physical properties can be further improved by using aramid fiber, glass fiber, carbon fiber, or PBO fiber as the reinforcing fiber of the inlay knitted fabric.

Further, the resin used as the endless carrier 2 can be filled with short fibers. By filling the short fibers, the coefficient of friction on the surface of the endless carrier can be reduced and the wear resistance can be increased. You can also.

[0026] As the short fibers, chemical fibers such as polyamide fibers and aramid fibers, metal fibers,
Carbon fiber and the like can be mentioned, and by filling them, a reinforced resin can be obtained. It is also possible to reinforce the sliding surface by partially exposing the fiber component, and to adjust the friction coefficient of the surface.

Also, by mixing at least one selected from molybdenum disulfide, graphite, and fluororesin into the resin, the friction coefficient of the surface of the endless carrier 2 can be reduced.

Examples of the fluorine resin include polytetrafluoroethylene (PTFE), polyfluoroethylene propylene ether (PFPE), tetrafluoroethylene hexafluoropropylene copolymer (PFEP), and polyfluoroalkoxyethylene (PFA). Is mentioned.

When a laminate of resin bands is used, a laminate of a plurality of thin belts made of the above-mentioned resins is used. The thickness of one belt is 100 to 5
When the thickness is less than 100 μm, sufficient strength cannot be obtained, and in particular, a problem such as easy cutting due to abrasion with a block in the lowermost layer and the uppermost layer occurs. It is not preferable because the flexibility is deteriorated and the power transmission efficiency is deteriorated.

Further, the number of laminated sheets is used in the range of 3 to 10 sheets to obtain a predetermined strength. If the number of laminated sheets is less than 3, a sufficient force for pressing the block toward the inner diameter of the pulley cannot be generated. The frictional force between them decreases,
Power transmission performance deteriorates. On the other hand, if the number of layers is more than 10, the speed difference between the inner layer and the outer layer becomes so large that slippage occurs, which causes problems such as abrasion and increased heat generation.

As described above, the resin layer is disposed and interposed between the portion of the block 3 that comes into contact with the pulley and the endless carrier 2, the sliding portion, and the portion where the front and rear blocks come into contact with each other.
The use of resin for the endless carrier 2 realizes a maintenance-free belt which does not require lubrication for supplying oil like a conventional belt made entirely of metal.

In the present invention, the metal band 13 is further disposed between the inner peripheral surface of the endless carrier 2 and the lower surface 4a of the engagement groove 4 of the block 3. Then, the peripheral length of the metal band 13 is set to be 0.1 to more than the peripheral length of the inner peripheral surface of the endless carrier 2.
0.3% longer.

Since the belt is wound around the pulley with tension, when the belt is run, it slides between the inner peripheral surface of the endless carrier 2 and the block 3 under the highest pressure, and wear is reduced. It can be said that this is a place that is likely to occur. In general, resin-to-metal has better slidability and less abrasion than resin-to-resin, so that a metal band is interposed at that point to greatly reduce abrasion. .

However, since the metal band 13 has a smaller elongation than the endless carrier 2 made of resin, if the metal band 13 having the same length as the endless carrier 2 is arranged, only the metal band 13 will be tensioned. Since the metal band 13 itself is cut early, the circumference is set longer than the inner peripheral surface of the endless carrier 2 so that tension is not applied only to the metal band 13.

If the elongation of the metal band 13 is less than 0.1%, the tension is applied only to the metal band 13 because the elongation is too small. If the elongation exceeds 0.3%, the span between the driving pulley and the driven pulley is reduced. In this case, the slack of the metal band 13 becomes excessively large, which impairs smooth running and decreases the transmission performance and the durability of the belt.

The metal band 13 is formed not only between the inner peripheral surface of the endless carrier 2 and the lower surface 4a of the engaging groove of the block 3 but also on the outer peripheral surface of the endless carrier 2 and the upper surface 4b of the engaging groove 4.
May be interposed. By arranging the metal bands 13 on both the inner peripheral side and the outer peripheral side of the endless carrier 2 in this manner, the wear at the portion where the endless carrier 2 and the block 3 come into contact is reduced, and the play between the two is reduced. It is less likely to occur, so that the occurrence of noise and rattling is reduced, the running performance is improved, and the life of the belt can be extended.

The metal band 13 of the present invention has a thickness of 0.1 to 0.2 mm made of steel or the like.
And the width is almost the same as that of the endless carrier 2. When the thickness is less than 0.1 mm,
Sufficient strength is not obtained, and cutting occurs early. 0.2m
If it exceeds m, the flexibility deteriorates, and the running of the belt is hindered, and the bending deterioration of the metal band 13 is undesirably accelerated. As the metal band 13, a band having a wavy shape as shown in FIG. 4 can be used in addition to a normal thin layer band. With such a band, the slack of the metal band 13 does not concentrate on one place, so that the hindrance of the running of the belt is alleviated.

In addition, at least one of the front and rear surfaces of the block 3 is coated with a fluororesin to prevent abrasion due to friction between the blocks or to prevent the endless carrier 2 of the block 3 from being worn.
It is also possible to similarly coat the sliding surface with a fluororesin. Doing so reduces wear,
Belt rattling occurs to prevent noise and prolong the life of the belt.

As the fluorine to be coated, polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer resin (PF
A) Polytetrafluoroethylene / hexafluoropropylene copolymer (PFEP), polyfluoroethylene propylene ether (PFPE), and the like can be used, and the form of use is a paint, epoxy, or polyamide. The above-mentioned PTFE, PFA, PFEP, and PF are applied to imide and polyethylene sulfide (PFS) paints.
A paint obtained by blending fluorine such as EP may be used.

[0040]

Next, the effect of the present invention was confirmed by running a belt using the examples of the present invention and comparative examples.

Example 1 As a belt used in Example 1, a belt in which two endless carriers having a shape as shown in FIG. 3 were engaged with both side surfaces of a block was used. The block is made of a core material made of aluminum A2024 and coated with 100 parts by weight of phenol resin mixed with 40 parts by weight of carbon fiber and 10 parts by weight of graphite, and the endless carrier is PBO (polyparaphenylene benzobisoxazole) fiber A polyimide resin film reinforced with a knitted cloth consisting of four layers having a thickness of 0.5 mm and a width of 10 mm was laminated. On the inner and outer peripheral surfaces of the endless carrier, a band having a thickness of 0.2 mm and a width of 10 mm made of a metal spring made of steel was laminated. The spring constant up to 0.3% elongation of the band is 10 kgf / mm.

A belt having a shape as shown in FIG. 3 was obtained by arranging 230 blocks having a thickness of 3 mm with an endless carrier pitch of 3 mm according to the above specifications.

Example 2 In Example 2, the same belt as in Example 1 was used, except that a band made of a metal spring was arranged only on the inner peripheral side of the endless carrier.

Comparative Example 1 In Comparative Example 1, the same belt as in Example 1 was used except that a band made of a metal spring was arranged only on the outer peripheral surface of the endless carrier.

Comparative Example 2 In Comparative Example 2, the same belt as in Example 1 was used except that a band made of a metal spring was not provided.

Using the belts of the above embodiment and comparative example,
The belt was run under running conditions as shown in Table 1. Table 2 shows the results.

[0047]

[Table 1]

[0048]

[Table 2]

As described above, as shown in Table 2, in Example 1 in which the bands made of metal springs were arranged on both the inner and outer peripheral surfaces of the endless carrier, the life was not reached even after running for 100 hours, and only the inner peripheral surface was used. In the second embodiment in which the bands are arranged, 9
Compared to the fact that it has only reached the end of its life when running for 4 hours,
In Comparative Example 1 in which the band is provided only on the outer peripheral surface and in Comparative Example 2 in which the band is not provided at all, the life is early due to abrasion, and the effect of preventing the abrasion by providing the band has appeared.

[0050]

According to the present invention, in order to achieve the above object, the engaging grooves of a plurality of blocks are slidably engaged with the endless carrier in the longitudinal direction. In a high-load transmission belt whose surface is made of resin, between the inner peripheral surface of the endless carrier and the lower surface of the engagement groove of the block,
A metal band is interposed, and the circumference of the metal band is 0.1 to 0.3% of the circumference on the inner circumferential surface of the endless carrier.
It is characterized by being long.

By arranging such a metal band, on the surface that slides between the block and the endless carrier,
Since the abrasion of both can be greatly reduced, the backlash between the block and the endless carrier is small, the performance of the belt can be improved, and the life of the belt can be extended.

In the second aspect, a metal band is also provided between the outer peripheral surface of the endless carrier and the upper surface of the engagement groove of the block.

By arranging metal bands not only on the inner week side but also on the outer peripheral side of the endless carrier, wear of the endless carrier and the block on the outer peripheral surface side of the endless carrier can be prevented. Performance and life can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of a high-load transmission belt.

FIG. 2 is a side view of a block.

FIG. 3 is a cross-sectional view of another embodiment of the high load transmission belt of the present invention.

FIG. 4 is a perspective view of a main part showing another example of a metal band.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Endless carrier 3 Block 4 Engagement groove 4a Lower surface 4b Upper surface 5 Belt side 6 Connecting member 7 Locking portion 8 Inclined surface 9 Convex portion 10 Concave portion 11 Core material 12 Resin layer 13 Metal band

Claims (2)

[Claims] 1. A high-load transmission belt in which engagement grooves of a plurality of blocks are slidably engaged with an endless carrier in a longitudinal direction, and a sliding surface of the block is made of resin. A metal band is interposed between the peripheral surface and the lower surface of the engagement groove of the block, and the peripheral length of the metal band is 0.1 to 0.3% longer than the peripheral length of the inner peripheral surface of the endless carrier. High load transmission belt characterized by the following. 2. The high-load transmission belt according to claim 1, wherein a metal band is also provided between the outer peripheral surface of the endless carrier and the upper surface of the engagement groove of the block.