JPH11101312A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the pitch noise, and to make the constant oil supply unnecessary, by forming an endless carrier by alternately stacking the resin bands and the metallic bands to form a layered body, and positioning the resin bands as the uppermost layer and the lowermost layer. SOLUTION: An endless carrier 2 is formed by alternately stacking the resin bands 2a and the metallic bands 2b, in such manner that the uppermost layer 4 and the lowermost layer 5 are formed by the resin bands 2a. By forming the uppermost layer 4 and the lowermost layer 5 to be kept into contact with a block 3, with the resin bands 2a, the constant oil supply for the lubrication, becomes unnecessary even in a push transmission type belt which is driven by the sliding of the metallic block 3 on the endless carrier 2, so that the belt driving device almost free from the maintenance, can be provided. Further by compensating the tensile strength of the resin bands 2a which is sometimes insufficient, with the metallic band 2b installed between the resin bands, the endless carrier 2 having the sufficient tensile strength can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, rubber V-belts have been used as belts applied to applications requiring high-load transmission, such as continuously variable transmissions. Maximum surface pressure is 10kg / c
m ² , and in applications where a torque greater than that is used, the rubber V-belt cannot withstand high side pressure and is buckled.

In view of this, there has been proposed a push transmission type metal belt in which a block slides on a metal band as disclosed in Japanese Patent Application Laid-Open No. 55-100443. Metal belts have excellent lateral pressure resistance and can withstand considerable high side pressure, so they are not easily buckled and deformed.Because of the push transmission, there is no need to lock the block by engaging it with a 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.

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

An example of a tension transmission belt using a block made of such a resin is disclosed in Japanese Patent Publication No. Sho 62-7418.
There is a block disclosed in Japanese Patent Application Laid-Open Publication No. H10-15064, in which slots are provided on both side surfaces, and a rubber belt is inserted into the slots.

This belt uses a resin for the block, and since the block has a self-lubricating property, there is no need to constantly supply oil, and the belt can be used in a more compact and maintenance-free manner. There is.

[0007]

However, in the belt described in Japanese Patent Application Laid-Open No. 55-100443, the block and the metal band are both made of metal, and the pulley is also made of metal. It is sliding between metals, and seizure occurs unless oil is constantly supplied. Then, there is a problem that a box for sealing the belt is required, a means for constantly supplying oil is required, and periodic inspection is required to keep the amount of oil within a certain range. Also, a large pressure must be applied between the pulley and the belt in order to provide a device for supplying oil and to perform friction transmission under conditions where the coefficient of friction is low such as in oil. However, in order to obtain a sufficient pressure, a high strength is required for the drive shaft, the driven shaft, its bearings, and the like, which necessarily results in a large-sized device.

Next, in the case of a belt as disclosed in Japanese Patent Publication No. 62-7418, since the block is made of resin and the tension band is made of elastomer such as rubber, lubrication like metal is not required. There is no need to constantly supply oil. However, since the block and the tension band are tension transmissions in a fixed relationship, a certain thickness of the block is required to withstand the shearing force generated between the block and the tension band. It is disadvantageous over the above-mentioned metal belt in that noise is generated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a high-load transmission belt that has little pitch noise by utilizing the advantages of the push transmission system and that does not need to constantly supply oil.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided an endless carrier in which engagement grooves of a plurality of blocks are slidably engaged with each other in a longitudinal direction. In a high load transmission belt in which guide protrusions and guide recesses are provided on front and rear surfaces of the high load transmission belt in which adjacent blocks are aligned by fitting the guide protrusions and the guide recesses, the endless carrier includes a resin band and a metal band. It is characterized by being composed of alternately laminated layers and having resin bands disposed on the uppermost layer and the lowermost layer.

With the above-described configuration, the thickness of the block can be reduced, so that unpleasant pitch noise can be suppressed as small as possible. The endless carrier is composed of a laminate of a resin band and a metal band, has a sufficient tensile strength, and is compact and maintenance-free because it does not need to be supplied with oil and lubricated. Can be realized.

According to the second aspect, since the endless carrier is made of resin filled with short fibers, the coefficient of friction on the surface of the endless carrier can be reduced and maintained for a long period of time.

According to the third aspect of the present invention, the resin constituting the endless carrier contains at least one selected from molybdenum disulfide, graphite and a fluororesin, so that the coefficient of friction of the surface of the endless carrier can be reduced. can do.

[0014]

FIG. 1 is a sectional view of a high-load transmission belt according to the present invention. The high-load transmission belt 1 according to the present invention has an engagement groove 3c of a large number of metal blocks 3 on an endless carrier 2.
The belt is slidably locked in the longitudinal direction of the belt.
When running around the pulley, the block is moved by the driving pulley, the block in front of the moved block in the belt traveling direction is pushed and the next block is pushed, and the block around the entire belt moves. This is a push transmission type belt in which the driven pulley rotates to transmit power.

A feature of the present invention is the endless carrier 2. In the present invention, the endless carrier 2 is a resin band 2a.
And the metal band 2b are alternately laminated, and the uppermost layer 4 and the lowermost layer 5
Is provided with a resin band 2a.

The uppermost layer 4 which comes into contact with the block 3
By using the resin band 2a as the lowermost layer 5, even in a push transmission type belt in which the metal block 3 slides and drives on the endless carrier 2, it is possible to eliminate the continuous supply of oil for lubrication. Therefore, it is possible to provide a belt driving device that is more maintenance-free. Further, the insufficient tensile strength of the resin band 2a alone is compensated for by the metal band 2b disposed therebetween, whereby the endless carrier 2 having a sufficient tensile strength can be obtained.

Resin band 2a constituting endless carrier 2
Examples of the material that can be used include aromatic polyamide resins, aromatic polyimide resins, aromatic polyamideimide resins, aromatic polyester resins, polyetheretherketone resins, polyethersulfide resins, phenolic resins, and epoxy resins. Can be

The thickness of one resin band 2a is 50 to 3
When it is less than 50 μm, sufficient strength cannot be obtained, and in particular, the lowermost layer 4 and the uppermost layer 5 cause problems such as easy cutting due to abrasion with the block. It is not preferable because the flexibility of the belt deteriorates and the power transmission efficiency deteriorates.

As the material of the metal band 2b, maraging steel, SUS304, 15-
7PH material can be mentioned. The thickness of one metal band 2b is in the range of 10 to 50 μm,
If it is less than this, the strength is insufficient, which is not preferable. If it exceeds 50 μm, it is not preferable in that the thickness of the endless carrier 2 increases and the weight increases.

The number of laminated layers of the resin band 2a and the metal band 2b of the endless carrier 2 is in the range of 10 to 30 in order to obtain a predetermined strength. Since a sufficient force for pressing the block to the side cannot be generated, the frictional force between the block and the pulley decreases, and the power transmission efficiency deteriorates. On the other hand, if the number of layers is more than 30, 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.

The resin band 2a can be filled with short fibers. By filling the short fibers, the coefficient of friction of the surface of the endless carrier 2 can be reduced and the pressure resistance can be increased. Examples of the short fiber include a chemical fiber such as a polyamide fiber and an aramid fiber, a metal fiber, a carbon fiber, and the like. By filling these fibers, 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 fluorine resin into the resin band 2a, 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),
Polyfluoroalkoxyethylene (PFA) and the like can be mentioned.

Next, in the example shown in FIG. 2, the block 3 is composed of two widthwise members 6, 7 and a connecting member 8 for connecting them at one end, and is attached to one end of the widthwise member 6. A groove for inserting the endless carrier 2 is opened.

The shape of the block 3 is not limited to that shown in FIG. 1, but as shown in FIG. 2, an I-shaped member composed of two widthwise members 6, 7 and a connecting member 8 connecting them at the center.
The block 3 may have a shape. In this case, an engagement groove 3c for inserting the endless carrier 2 is formed on both sides of the block 3. The belt is a belt in which the block 3 is slidably engaged on the pair of endless carriers 2.

Further, an engagement groove 3c into which the endless carrier 2 is inserted is opened upward by a substantially U-shaped block 3 as shown in FIG. 3, and the inserted endless carrier 2 is locked so as not to come off. High load transmission belt 1 provided with portions 3a, 3a
But it doesn't matter.

The block 3 is provided with an inclined surface 9 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 are in contact only with the upper part. ing. As shown in FIG. 5, the connecting member 8 is provided with a guide convex portion 10 on the front surface in the belt traveling direction and a guide concave portion 11 on the rear surface at a position corresponding to the guide convex portion. The block 3 is arranged on the endless carrier 2 by fitting the convex portion 10 and the guide concave portion 11.

The guide projections 10 and the guide recesses 11 can be provided in various forms such as one at the center line in the width direction of the widthwise member 6 and two at the left and right sides. In the present invention, the resin layer 12 may be disposed on the block side on the side surfaces 3b and 3b, which are the contact surfaces of the block 3 with the pulleys, and on the sliding surface between the block 3 and the endless carrier 2. In other words, by arranging and interposing the resin layer 12 at a portion where large friction occurs in the high-load power transmission belt 1, in combination with the use of the resin for the endless carrier 2, lubrication for supplying oil as in the related art is required. This realizes a maintenance-free belt.

The resin used for the resin layer 12 has a relatively large friction coefficient and excellent wear resistance.
Specifically, a hard rubber having a hardness of 90 ° JIS A or more, a hard polyurethane resin, a liquid crystal resin, a phenol resin, an epoxy resin, a polyamide resin, a polyester resin, an acrylic resin, a methacrylic resin, a polyetheretherketone (PEEK) resin, and the like. Although a synthetic resin is used, it is particularly preferable to use a resin having a low friction coefficient.

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 has a core material 13 buried as a portion for imparting lateral pressure resistance and bending rigidity to the block. The material is a metal such as an aluminum alloy or iron. Even if a resin reinforced with a woven fabric of carbon fiber or aramid fiber, swatch, or the like having sufficient strength is used, it does not depart from the spirit of the present invention.

The block 3 is made of a metal material in terms of imparting lateral pressure resistance and bending rigidity. It is preferable to use a block in which a resin layer 12 is coated on a predetermined portion of a metal core material. With the above configuration, in the high load transmission belt having the configuration of the present invention, particularly, a portion where sliding is large and friction is remarkably generated is the resin layer 12.

When the resin layer 12 is arranged at a predetermined position,
By using a core material 13 made of a metal material slightly smaller than the size of the block and covering the entire surface with a resin layer, for example, as shown in FIG.
This is a preferable embodiment because problems such as peeling of the resin layer hardly occur as compared with the case where 2 is covered and arranged. However, even if the entire surface is contacted with the member for fixing the core material when coating the resin layer in the manufacturing process, a portion where the core material is exposed will be generated. The exposure of the core material may be included in a form in which the entire surface is substantially covered with the resin.

However, by arranging the resin layer in other portions as described below, it is possible to make the belt run without fear of burn-in or the like. First, as shown in FIG. 5, the front and rear blocks 3 are fitted to each other in the guide convex portion 10 and the guide concave portion 11 provided on the front surface and the rear surface of the block 3 in the belt traveling direction, but the belt is bent. Sliding occurs at that portion, and friction occurs. Therefore, by arranging a resin layer on one or both of the guide protrusions 10 and the guide recesses 11, rattling between the guide protrusions 10 and the guide recesses 11 hardly occurs, and the life of the belt is extended. be able to. Of course, the entire guide protrusion 10 may be a resin layer.

[0034]

As described above, according to the high load transmission belt of the present invention, the engaging grooves of the plurality of blocks are slidably engaged with the endless carrier on the endless carrier in the longitudinal direction, and the adjacent blocks are connected to each other. In a high-load transmission belt of a push transmission type in which the guide convex portion and the guide concave portion are aligned by fitting, the endless carrier is formed of a laminate in which resin bands and metal bands are alternately arranged, and the uppermost layer and the lowermost layer Is characterized by having a resin band

With the above configuration, the thickness of the block can be reduced, so that unpleasant pitch noise can be suppressed as small as possible. In addition, the uppermost layer and the lowermost layer, which are the contact points of the endless carrier with the block, can be formed. Made of resin material, there is no need to continue supplying oil and lubricating. Further, a sufficient tensile strength can be obtained by the metal band, and a compact and maintenance-free high-load transmission belt can be realized.

According to the second aspect, since the endless carrier is made of resin filled with short fibers, the coefficient of friction on the surface of the endless carrier can be reduced and maintained for a long time.

According to a third aspect of the present invention, the resin constituting the endless carrier contains at least one selected from molybdenum disulfide, graphite and a fluorine-based resin, so that the coefficient of friction on the surface of the endless carrier is reduced. can do.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view corresponding to FIG. 1, illustrating another example of a block.

FIG. 3 is a cross-sectional view corresponding to FIG. 1 and showing another example of a block.

FIG. 4 is a sectional view taken along line BB in FIG. 1;

FIG. 5 is a sectional view taken along line AA in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Endless carrier 2a Resin band 2b Metal band 3 Block 3c Engaging groove 4 Top layer 5 Bottom layer 6 Width member 7 Width member 8 Connecting member 9 Inclined surface 10 Guide convex part 11 Guide concave part 12 Resin layer 13 core material

Claims (3)

[Claims] An engaging groove of a plurality of blocks is slidably engaged with an endless carrier in a longitudinal direction, and guide protrusions and guide recesses are provided on front and rear surfaces of the blocks. In a high-load transmission belt that is aligned by fitting a convex portion and a guide concave portion, an endless carrier is formed of a laminated body in which a resin band and a metal band are alternately laminated, and a resin band is disposed in an uppermost layer and a lowermost layer. High load transmission belt characterized by the following. 2. The high-load transmission belt according to claim 1, wherein the resin band is made of a resin filled with short fibers. 3. The high-load transmission belt according to claim 1, wherein the resin constituting the resin band is filled with at least one selected from molybdenum disulfide, graphite, and a fluorine-based resin.