JPH10103416A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniform frictional force generated between a block and a V-shaped groove laterally so as to prevent reduction of transmission force and durability by fitting and fixing the block to a center belt from right and left directions alternately, and preventing at least a side surface of a side pillar from being brought into contact with the V-shaped groove of a pulley. SOLUTION: A center belt fitting groove 10 provided with an opening part 9 is formed on one side of V-shaped groove opposing surfaces 5a, 5b as the side surfaces of both sides of a block 5 in which an upper beam part 6 and a lower beam part 7 are connected to each other by a side pillar 8. A side surface 8a of a V-shaped groove side of the side pillar 8 is formed in a recessed shape which is recessed more than the V-shaped groove opposing surface 5a without being brought into contact with the V-shaped groove of a pulley. Parts which are brought into contact with the V-shaped groove of the pulley of the block 5 are only side surfaces 6a, 6b of the upper beam part 6 and side surfaces 7a, 7b of the lower beam part 7, and thereby, contact areas of the V-shaped groove are made equal laterally though the block 5 is not formed symmetrical laterally, and frictional forces generated between the block 5 and the V-shaped groove are made equal laterally.

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 and metal belts as disclosed in Japanese Patent Application Laid-Open No. 55-100443 have been used as belts applied to applications requiring high load transmission, such as continuously variable transmissions. Proposed. However, a rubber V-belt with a maximum surface pressure of 10 kg even for high load
/ Cm ² , and in applications where a torque greater than that is applied, the rubber V-belt cannot withstand high side pressure and is buckled.

[0003] A metal belt is excellent in lateral pressure resistance and can withstand a considerably high lateral pressure so that it does not buckle. However, in general, the speed change pulley is made of a metal material such as iron or aluminum alloy. Metal belt is used to prevent seizure and wear of the contact surface with the pulley.
You must keep running while supplying oil. In that case, a device for supplying oil must be provided, so that the belt transmission must be large.

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 been proposed.

As an example using such a block, there is a block disclosed in Japanese Patent Publication No. 62-7418, in which slots are provided on both side surfaces of a block, and a rubber belt is inserted into the slot. .

[0006] Since this belt has a structure in which a block is fitted and fixed for fixing, the thickness of the block is smaller than that of a belt in which a block and a center belt are fixed using a fastening material, for example. Can be thin. Therefore, there is an advantage that pitch noise when the belt runs can be suppressed to a low level.

[0007]

[Problems to be solved by the invention]
Since the belt disclosed in Japanese Patent No. 7418 uses two center belts, if the lengths of the two center belts are different, the belt assembled by assembling the blocks may be twisted as a whole belt. In other words, if the vehicle travels on the pulley as it is, stable traveling cannot be obtained, and there is a problem that the power transmission efficiency is reduced and the blocks are unevenly worn.

Therefore, as shown in FIG. 5, the upper beam portion and the lower beam portion of the block are connected at the ends by side pillars to form a substantially U-shape. If a belt is used in which the blocks are fitted alternately left and right, the above-mentioned problem of the belt being twisted disappears.

However, since the area of the V-groove facing surface of the block having the substantially U-shape in contact with the V-groove of the pulley is different between the left and right, the balance of the right and left frictional forces generated between the block and the V-groove is lost. In the same belt, the speed on the side where the frictional force is large increases, and the block skews in the running direction.

[0010] For this reason, transmission power and durability are reduced. Therefore, in the present invention, even when a substantially U-shaped block is used, the frictional force generated between the block and the V-groove can be balanced on the left and right, and the transmission force and durability deteriorate due to skew of the block. It is an object of the present invention to provide a high-load transmission belt that prevents the occurrence of a load.

[0011]

In order to achieve the above object, according to the present invention, there is provided an endless center belt in which a core wire is embedded in an elastomer, and a V groove facing the V groove. In a high-load transmission belt having a configuration in which a plurality of blocks having surfaces are fitted and locked to the center belt, the block includes an upper beam portion, a lower beam portion, and side pillars that connect both beam portions at one end. Blocks are alternately fitted and fixed to the center belt from the left and right directions,
It is characterized in that at least the side surface of the side pillar is not brought into contact with the V groove of the pulley, and the side pillar existing only on one side of the block is not brought into contact with the V groove. , The frictional force generated in the right and left directions becomes uniform, and skewing of the block can be prevented.

According to the second aspect, not only the side pillars but also both side surfaces of the upper beam portion are not brought into contact with the V-shaped groove of the pulley, so that the right and left balance can be more reliably achieved.

[0013]

1 is a perspective view of a high-load transmission belt according to the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is a sectional view taken along line BB in FIG. 1, and FIG. FIG. 10 is a cross-sectional view corresponding to FIG. 2 according to another embodiment of FIG.

The high-load transmission belt 1 of the present invention comprises a center belt 4 having a core 3 spirally embedded in an elastomer 2 and a plurality of blocks 5 fitted and arranged in the longitudinal direction of the center belt 4. The block 5 has a structure in which an upper beam portion 6 and a lower beam portion 7 are connected by a side pillar 8, and the V-groove opposing surfaces 5a, 5a on both sides of the block.
b has a substantially U-shape having a center belt fitting groove 10 having an opening 9 at one side, and V-faces 5a and 5b of the V-groove facing surfaces are inclined and have an angle corresponding to the V-groove angle of the pulley. . Further, the lower half of the front surface 11 of the block 5 from the vicinity of the vertical center of the side pillar 8 including the lower beam portion 7 is an inclined surface, so that when the belt enters the pulley and bends, the front and rear blocks are connected to each other. The front surface 11 and the back surface 12 do not contact each other.

The center belt 4 has a fitting recess or a fitting protrusion with a constant pitch on at least one of the upper surface and the lower surface, and the fitting groove 10 of the block 5 also has a fitting protrusion or a fitting recess. When the fitting concave portion or fitting convex portion of the center belt 4 and the fitting convex portion or fitting concave portion of the fitting groove 10 of the block 5 mesh with each other, the block 5 and the center belt 4 move in the belt length direction. Is fixed and can be removed in the belt width direction.

Next, the center belt fitting groove 10 of the block 5 is set to be substantially equal to the thickness of the center belt 4, and the center belt fitting prevention grooves 15, 16 in which the width of the fitting groove is reduced in the opening 9. Is formed. In addition, as the slip-off preventing portions 15 and 16, a protrusion having a wall surface that stands substantially vertically on the inside of the groove and having a taper falling to the outside of the groove, a rectangular protrusion or a protrusion having a taper falling to the inside of the groove may be used.

Further, as shown in FIG. 2, since the block 5 has an asymmetrical shape on the left and right, the opening 5 of the center belt fitting groove is provided on the right side of the block 5 in order to balance the entire belt 1. The two types of blocks are prepared on the left side and the left side, and when the block 5 is mounted on the center belt 4, the blocks to be mounted from the right side and the blocks to be mounted from the left side of the center belt 4 are alternately arranged to balance the weight of the entire belt. As a result, stable running is possible.

The material used as the elastomer 2 constituting the center belt 4 is NR (natural rubber),
HN containing SBR (styrene / butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), hypalone (chlorosulfonated polyethylene), HNBR (hydrogenated nitrile rubber), metal salt of unsaturated carboxylic acid
A rubber compound comprising a single material of rubber such as BR or a blend thereof, a polyurethane resin, and the like.

As the core body 3 embedded in the elastomer 2 in a spiral shape, a synthetic fiber such as polyamide, polyester, or aramid, or a steel cord,
A cord made of a single inorganic fiber such as a glass fiber cord or a carbon fiber cord, a twisted cord made of a blend of these, and a woven fabric are used.

As shown in FIG. 2, the block 5 is formed by covering the entire surface of a metal reinforcing material 15 with a resin 16, and at least the resin 16 is in contact with a pulley. Need to be provided at portions corresponding to the V groove facing surfaces 5a and 5b, and are not limited to those covering the entire surface of the reinforcing member 15 as described above. A configuration in which only the surface is coated with the resin 16 can also be used.

At least the V groove facing surface 5a of the reinforcing member 15
The resin for coating 5b has a relatively large coefficient of friction and is excellent in abrasion resistance, and has a higher rigidity than the elastomer 2 forming the center belt 4, specifically, a hardness of 90 ° J.
Synthetic resin such as hard rubber, hard polyurethane resin, liquid crystal resin, phenol resin, epoxy resin, polyamide resin, polyester resin, acrylic resin, methacrylic resin, polyetheretherketone (PEEK) resin or the like of ISA or higher, or these resins It is made of a reinforced resin mixed with a woven fabric made of chemical fiber such as cotton yarn, polyamide fiber and aramid fiber, glass fiber, metal fiber, carbon fiber and the like, filler, whisker, silica, calcium carbonate and the like.

In the block 5, as shown in FIG. 3, the side surface 8a on the V-groove side of the side pillar 8 is a recess recessed from the V-groove facing surface 5a so as not to contact the V-groove of the pulley. I have. By doing so, only the side portions 6a and 6b of the upper beam portion and the side surfaces 7a and 7b of the lower beam portion are in contact with the V groove of the pulley in the block 5. Then, although the block 5 itself has an asymmetric shape in the left and right, the area in contact with the V-groove is equal on the left and right, and the frictional force generated between the block 5 and the right and left is equal on the left and right. No skew of 5 occurs. Therefore, it is possible to prevent a decrease in the transmission and durability due to the skew of the block 5.

FIG. 4 shows another embodiment, in which not only the side pillars 8 but also the side surfaces 6a and 6b of the upper beam portion 6 are recessed. Side surfaces 7a and 7b are provided. With this configuration, the contact area with the V-groove is reduced. However, in the example of FIG. 3, the surface in contact with the V-groove on one side of the block 5 facing the V-groove is interrupted by the side pillar 8. Six sides 6a,
On the other hand, in the example of FIG. 4, the side surface 7a is one continuous side surface 7a, so that it is more reliable in the sense of maintaining the right and left balance. Therefore, the problem of skew of block 5 is
There is an advantage that prevention can be more reliably performed.

[0024]

Next, a test was conducted to measure the life of the belt of the present invention by actually running the belt.

In Example 1, a belt using a block in which the side surfaces of the side pillars are recessed as shown in FIG. 3 so as not to contact the V groove of the pulley was used. Example 2
As shown in FIG. 4, a belt using a side pillar and a block in which the side surface of the upper beam portion is formed as a recess and only the side surface of the lower beam portion is brought into contact with the V groove is used.

As a comparative example, a substantially U-shaped block as in Examples 1 and 2, but the side surfaces of the lower beam portion, the upper beam portion, and the side pillars are also brought into contact with the V-grooves. A belt using a block as shown in FIG. 5 was used.

The running condition is such that the pitch diameter of the driving pulley is 65.
mm, the rotation speed is 3200 rpm, the pitch diameter of the driven pulley is 130 mm, the rotation speed is 1600 rpm, the ambient temperature is 90 ° C., and the load is 18 PS. The time until the life of each belt was measured, and the failure phenomenon was observed. Table 1 shows the results.

[0028]

[Table 1]

As can be seen from Table 1, Examples 1 and 2 in which the side surfaces of the side pillars are recessed have a longer life than the comparative example in which the side surfaces of the side pillars are also in contact with the V grooves of the pulley. The result was obtained. Looking at the failure phenomena, in the comparative example, uneven wear of the block was observed and the block was cut early, whereas in Examples 1 and 2, uneven wear was not observed and the life was long.

[0030]

As described above, the high-load transmission belt of the present invention according to claim 1 has an endless center belt in which a core wire is embedded in an elastomer, and a V-groove facing surface which engages with the V-groove. In a high-load transmission belt having a configuration in which a plurality of blocks are fitted and locked to the center belt, the blocks include an upper beam portion, a lower beam portion, and side pillars that connect the two beam portions at one end. A belt which is alternately fitted and fixed to the belt from the left and right directions. At least the side surfaces of the side pillars are recessed from the V groove facing surface, and the side pillars existing only on one side of the block are not brought into contact with the V groove. Therefore, the frictional force generated between the block and the V-groove is equal in the left and right directions, and the skewing of the block can be prevented.

In the second aspect, not only the side pillars but also both side surfaces of the upper beam portion are recessed from the facing surface of the V-groove so as not to contact the V-groove, so that the right and left balance is ensured. And the frictional force generated between the block and the V-groove becomes equal in the left and right directions, so that it is easy to prevent the block from skewing.

[Brief description of the drawings]

FIG. 1 is a perspective view 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 taken along line BB in FIG. 2;

FIG. 4 is a sectional view corresponding to FIG. 3 according to another embodiment of the present invention.

FIG. 5 is a sectional view of a conventional high-load transmission belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 Core 4 Central belt 5 Block 6 Upper beam 6a Side 6b Side 7 Lower beam 7a Side 7b Side 8 Side pillar 8a Side 9 Opening 10 Center belt fitting groove 13 Convex section 14 Groove

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yosei Komai 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsuhoshi Belt Co., Ltd.

Claims (2)

[Claims] 1. An endless center belt having a core wire embedded in an elastomer, and an inclined V which engages a V groove of a pulley.
In a high-load transmission belt having a configuration in which a plurality of blocks having groove-facing surfaces are fitted and locked to the center belt, the blocks include an upper beam portion, a lower beam portion, and side pillars connecting the two beam portions at one end. , The block is alternately fitted and fixed to the center belt from the left and right directions,
A high-load transmission belt, wherein at least a side surface of a side pillar is configured not to contact a V groove of a pulley. 2. The high-load transmission belt according to claim 1, wherein both side surfaces of the upper beam portion are configured not to contact the V groove of the pulley.