JP2000009188A - Heavy load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce wear of a start part of an inclined face so as to reduce looseness and noise of a belt by providing abutting parts in an inclination start position of a block front face and its rear face, and bringing front and rear blocks in face contact when the belt bends. SOLUTION: A block 3 comprises two cross direction members 4, 5 and a connecting member 6 for connecting these members at one end. A groove is opened at one end of the cross direction member 4, and an endless carrier 2 is inserted therein right and left alternately. The block 3 is provided with an inclined face 7 below so that a belt is bendable on a pulley, and when the belt does not bend, the front and rear blocks 3 come in contact only at the upper parts. A protruding streak part 8 is provided in an inclination start position where the inclined face 7 starts, at the front face in the proceeding direction of the belt. The back face is provided with a groove part 9 fitted in a face contact state of the protruding streak part 8, and the front and rear blocks 3 come in face contact in the bent state of the belt. Wear of an inclination start line is not therefor generated even if the belt repeats bending and extending at high speed under heavy load.

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, and is used for high-load transmission comprising a center belt and a block for reinforcing a lateral pressure resistance. It relates to the belt to be provided.

[0002]

2. Description of the Related Art Conventionally, a rubber V-belt has been used as a belt applied to an application requiring a high load transmission such as a continuously variable transmission. However, the maximum surface pressure is about 10 kg / cm ² , and the rubber V-belt cannot withstand the high side pressure and is buckled and deformed if the application requires more torque.

Therefore, a compression transmission type metal belt in which a block slides on a metal band as disclosed in Japanese Patent Application Laid-Open No. 55-100443 has been proposed. 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.

Further, in a belt of a type in which a plurality of such blocks are arranged on a metal band so as to overlap each other and the block transmits power by pushing the blocks, the belt can be bent when the belt is wound around a pulley. An inclined surface is provided on the inner peripheral side of the front surface of the block in order to make the block similar.

[0005]

Such a belt runs at high speed under a large load. Of course, it passes through the straight running portion and the bent running portion in the pulley many times, and the bending and stretching are repeated countlessly.

Among the above belts, Japanese Patent Application Laid-Open No. 55-1004
In a belt as disclosed in Japanese Patent Publication No. 43, at the start line of the inclined surface on the inner peripheral side of the block, each time the bending is repeated, the front and rear blocks are rotated around the start line only in contact with the start line. .

[0007] As described above, the belt runs at high speed under a large load. And since the turning around the start line of the inclined surface will be countless,
It can be said that the starting line portion which is the center of the turning is a portion where wear is particularly fast.

Further, the contact between the front and rear blocks at the start line portion is a line contact in the pulley, and is generally in a shape that is more likely to be worn and easily deformed by compression. When abrasion and compression deformation occurs in that portion, rattling occurs between adjacent blocks in front and rear, leading to a reduction in power transmission efficiency and an increase in noise.

The present inventors have also filed 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.

[0010] The resin material is more remarkably worn due to friction and impact than metal, so that a greater amount of wear occurs at the start of the inclined surface, resulting in an early life of the belt.

Therefore, the present invention is directed to a compression transmission type belt, in which abrasion due to contact between blocks is small even when high speed rotation is continued for a long time under a high load, and of course, a dry compression transmission belt using a resin material has an inclined surface. It is an object of the present invention to provide a high-load transmission belt capable of greatly reducing abrasion at a start portion of the transmission belt and reducing rattling and noise of the belt.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, engagement grooves of a plurality of blocks are slidably engaged on an endless carrier in a longitudinal direction. In a high-load transmission belt having an inclined surface on the inner peripheral side so that the belt can be bent when the belt is wound around the pulley, an abutment portion between the blocks is provided at an inclination start position on the front surface of the block and a rear surface thereof, When the belt is bent, the front and rear blocks come into surface contact with the contact portion.

By adopting such a configuration, the contact between the adjacent blocks becomes a surface contact, and even if the belt continues to rotate at a high load and at a high speed, abrasion occurs at the starting position of the inclined surface on the front surface of the block. Therefore, it is possible to prevent rattling of the block and generation of noise due to it.

According to a second aspect of the present invention, as the abutment between the blocks, a ridge extending in the width direction of the block is provided at an inclination start position on the front surface of the block, and a groove which fits into the ridge is provided on the rear surface. The blocks adjacent to each other are fitted in a state where the ridges and grooves are in surface contact.

[0015] In addition to the effect obtained in the first aspect, the rattling of the block and the generation of noise due to it can be further reduced by fitting the convex ridge and the groove.

According to a third aspect of the present invention, the contact surface between the block and the pulley, the contact surface between the blocks, and the contact surface between the block and the endless carrier are a high-load transmission belt formed of a resin. It is not necessary to constantly supply oil as compared to a belt that runs in a state in which oil is lubricated by contacting metal surfaces with each other, leading to compact equipment and reduced maintenance.
There is a problem that it is more easily worn than metal, and the effect of preventing abrasion by the configuration according to claim 1 is remarkable.

[0017]

FIG. 1 is a cross-sectional view of a main part of a high-load transmission belt according to the present invention, and FIG. 2 is a side view in which adjacent blocks are bent.

The high-load transmission belt 1 of the present invention is a belt that is slidably engaged with the engagement grooves of a number of blocks 3 on the endless carrier 2 so as to be slidable at least in the belt longitudinal direction. Then, the block is moved by the driving pulley, the block in front of the moved block in the belt traveling direction is pushed and pushes the next block, and the driven pulley is rotated by the movement of the block all around the belt. This is a compression transmission type belt that transmits power.

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 for compression transmission. An example of the shape is shown in FIG. In the example shown, two width direction members 4,
5 and a connecting member 6 connecting them at one end,
A groove for inserting the endless carrier 2 is opened at one end of the width direction member 4. And the block is arrange | positioned so that the endless carrier 2 may be inserted alternately left and right.

In portions other than the basic shape, the block 3 is provided with an inclined surface 7 below so that the belt can be bent on the pulley. When the belt is not bent between the pulleys, the front and rear blocks 2 Only the upper part is in contact. At the inclination start position where the inclined surface 7 starts, a partially cylindrical convex ridge 8 is provided on the front surface in the belt traveling direction, and a groove with a shape fitted to the convex ridge 8 in surface contact with the rear surface. The portion 9 is provided so that the front and rear blocks are in surface contact even when the belt is bent.

The feature of the present invention is the position and the shape of the ridges 8 and the grooves 9 provided in the present invention. In the present invention, as shown in FIG. And a partial cylindrical shape extending in the belt width direction of the block 3.

In the conventional block, as shown in FIG. 4, when the belt is bent, the blocks 2 adjacent to each other before and after the belt are bent.
The contact between 0 and 20 is a contact at the inclination start line 21,
Moreover, the contact is only a line contact. If the belt continues to run at high speed and under high load, abrasion occurs at the slope start line, and a gap is gradually formed between the blocks. It also leads to an increase and a decrease in power transmission capacity.

In addition to the above-mentioned ridges 8 and grooves 9, as a means for fitting unevenness in order to align the block 3 in the belt width direction, a block is provided at a position close to the belt pitch line. The part 10 and a concave part 11 to be fitted thereto are provided on the back surface.

By adopting the configuration as in the present invention,
The contact between the front and rear blocks 3 is a surface contact, and even if the belt 1 continues to run at high load at high speed and repeatedly bends and expands, the abrasion at the inclination start line as in the related art does not occur, and the block 3 is damaged. It can be said that the belt has a longer service life because no rattling occurs.

The shape of the block 3 is not limited to the one shown in FIG. 1, but as shown in FIG. 3, an I-shaped member composed of two widthwise members 4, 5 and a connecting member 3 for connecting them at the center. A block 3 having a shape may be used. In this case, a groove for inserting the endless carrier 2 is formed on both side surfaces of the block 3. The belt is a belt in which the block 3 is slidably engaged on the pair of endless carriers 2.

Next, the block 3 may be made of a block made of a metal such as duralumin, iron, titanium, or the like, or a resin layer coated on the surface of a highly rigid core made of a metal or fiber-reinforced resin. Blocks and the like can be mentioned.

By arranging a resin layer at a portion of the high-load transmission belt 1 where a large amount of friction is generated, combined with the use of the resin for the endless carrier 2, it is necessary to provide conventional lubrication for supplying oil. This realizes a maintenance-free belt.

In the case of a block of a type in which a core material is coated with a resin layer, the resin used for the resin layer has a relatively large friction coefficient and excellent wear resistance, and specifically, a hardness of 90 ° JIS A The above hard rubber, hard polyurethane resin, liquid crystal resin, phenol resin, epoxy resin,
Polyamide resin, polyester resin, acrylic resin, methacrylic resin, polyetheretherketone (PEE
K) A synthetic resin such as a resin is used, and among them, a resin having a low friction coefficient is preferably used.

In these resins, synthetic fibers such as cotton yarn, polyamide fiber and aramid fiber, staple fiber made of glass fiber, metal fiber, carbon fiber and the like, woven fabric, filler, whisker, silica, calcium carbonate, etc. It is also possible to use a reinforced resin mixed with an inorganic material or the like. It is also possible to reinforce the sliding surface by partially exposing the fiber component, and to adjust the friction coefficient of the surface.

The block 3 may be made of a metal such as aluminum alloy or iron as a material used for a core which is a part for imparting lateral pressure resistance and bending rigidity of the block. A resin reinforced with a woven fabric of fibers or aramid fibers, a scum, etc., having sufficient strength may be used.

When the surface of the metal core material is coated with the resin layer, it is also possible to adopt a configuration in which only one surface is coated with the resin on the contacting surfaces such as adjacent blocks.

The endless carrier 2 can be used as a laminate of metal bands made of maraging steel or the like, a laminate of metal bands and resin bands alternately laminated,
Examples thereof include a metal band coated with a resin and a resin band laminated with a resin band. The endless carrier 2 using the inner resin as described above eliminates the continuous supply of oil for lubrication even in a compression transmission type belt in which the block 3 is driven to slide on the endless carrier 2. Therefore, it is possible to provide a belt driving device that is more maintenance-free.

In the case of the endless carrier 2 using a resin material, resins that can be used as the material include aromatic polyamide resins, aromatic polyimide resins, aromatic polyamideimide resins, aromatic polyester resins, and the like.
Examples thereof include a polyether ether ketone resin, a polyether sulfide resin, a polyphenylene sulfide resin, a polyethylene terephthalate resin, a fluorine resin, a silicone resin, a polycarbonate resin, a phenol resin, and an epoxy resin.

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 50-30
When the thickness is less than 50 μm, sufficient strength cannot be obtained, and in particular, the lowermost layer and the uppermost layer easily break due to abrasion with the block. It is not preferable because the flexibility is deteriorated and the power transmission efficiency is deteriorated.

In order to obtain a predetermined strength, the number of laminated sheets is in the range of 2 to 10 sheets. When the number of laminated sheets is less than 3, 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 20, the speed difference between the inner layer and the outer layer becomes so large that slipping occurs, which causes problems such as abrasion and increased heat generation.

As another form of the endless carrier 2, a resin in which a knitted fabric is embedded in a resin can be used. By embedding a knitted fabric, the dimensional stability, bending fatigue resistance, and tear resistance of the endless carrier 2 in the longitudinal direction can be improved, and of course, the above-described performance as a high-load transmission belt to which a block is attached is excellent. Can be obtained. In addition, to embed a knitted fabric in the resin here means not only a state in which the knitted fabric is completely hidden in the resin, but also a situation in which both ends of the knitted fabric are partially exposed. It may be more appropriate to describe that the knitted fabric is coated with resin.

The knitted fabric embedded in the resin 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 or carbon fiber as the reinforcing fiber of the inlay knitted fabric.
As a material used for the knitted fabric, polyester fiber, polyamide fiber, liquid crystal polymer, polyimide fiber, or the like can be used.

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.

Examples of the short fibers used include chemical fibers such as polyamide fibers and aramid fibers, metal fibers, and the like.
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.

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

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

[0043]

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

As an example, the basic shape is a belt using a block as shown in FIG. 1. The block uses a duralumin core material, and carbon fiber is 20 parts by weight with respect to 100 parts by weight of phenol resin. A block coated with a fiber reinforced resin filled with 20 parts by weight of glass fiber, provided with a partially cylindrical protruding portion at the inclination start position on the front surface of the block, and provided on the rear surface with a groove portion having a shape to be fitted thereto. Was. In addition, 230 blocks having a pitch of 3 mm and a thickness of 3 mm are arranged on one belt.

As a comparative example, a belt was used under the same conditions as in the example except that no ridges and grooves were provided.

The running conditions were as shown in Table 1 below, and the total block gap generated in the belt during running for a predetermined time was measured. Table 2 shows the results.

[0047]

[Table 1]

[0048]

[Table 2]

As can be seen from the results in Table 2, in comparison with the present invention, in the belt of the comparative example using the block having no partial cylindrical ridge at the inclination starting position, the increase in the gap between the blocks with respect to the running time was increased. It is large and is unable to run after running for 24 hours.

[0050]

As described above, the high-load transmission belt according to the present invention relates to a high-load transmission belt according to the present invention, in which the engagement grooves of a plurality of blocks are slidable in the longitudinal direction on an endless carrier. In the case of a high-load transmission belt having an inclined surface on the inner peripheral side so that the belt can be bent when the belt is wound around the pulley, the blocks are arranged at the inclination start position on the front surface of the block and at the rear surface. Are provided, and when the belt is bent, the front and rear blocks come into surface contact with the contact portion.

By adopting such a configuration, the contact between the adjacent blocks becomes a surface contact, and even if the belt continues to rotate at a high load and at a high speed, abrasion occurs at the starting position of the inclined surface on the front surface of the block. Therefore, it is possible to prevent rattling of the block and generation of noise due to it.

According to the second aspect of the present invention, as the contact portion between the blocks, a ridge extending in the width direction of the block is provided at the inclination start position on the front surface of the block, and a groove which fits into the ridge is provided on the rear surface. The blocks adjacent to each other are fitted in a state where the ridges and grooves are in surface contact.

By fitting the convex ridge and the groove, the rattling of the block and the generation of noise due to the rattling of the block can be further reduced in addition to the effect obtained in the first aspect.

According to a third aspect of the present invention, the contact surface between the block and the pulley, the contact surface between the blocks, and the contact surface between the block and the endless carrier are made of a high-load transmission belt made of resin. It is not necessary to constantly supply oil as compared to a belt that runs in a state in which oil is lubricated by contacting metal surfaces with each other, leading to compact equipment and reduced maintenance.
There is a problem that it is more easily worn than metal, and the effect of preventing abrasion by the configuration according to claim 1 is remarkable.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of a portion where adjacent blocks are bent.

FIG. 3 is a front view showing an example of another block.

FIG. 4 is a cross-sectional view corresponding to FIG. 2 of a conventional belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Endless carrier 3 Block 4 Width member 5 Width member 6 Connection member 7 Inclined surface 8 Convex ridge 9 Groove ridge

Claims (3)

[Claims] An engaging groove of a plurality of blocks is engaged with an endless carrier so as to be slidable in a longitudinal direction, and an inner peripheral surface is formed on a front surface of the block so that the belt can be bent when the belt is wound around a pulley. In a high load transmission belt having an inclined surface on the side,
A high-load transmission belt, wherein a contact portion between the blocks is provided at an inclination start position on a front surface of the block and a rear surface thereof, and when the belt is bent, the front and rear blocks come into surface contact with the contact portion. 2. As a contact portion between the blocks, a ridge portion extending in the width direction of the block is provided at a tilt start position on the front surface of the block, and a groove portion fitted to the ridge portion is provided on a rear surface thereof.
2. The high-load transmission belt according to claim 1, wherein the blocks adjacent to each other are fitted in a state in which the protruding portions and the groove portions are in surface contact. 3. The high-load transmission belt according to claim 1, wherein a contact surface between the block and the pulley, a contact surface between the blocks, and a contact surface between the block and the endless carrier are formed of resin.