JPH09317828A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacture, to prevent the falling of a block and to reduce noises. SOLUTION: In a high load transmission belt 1 in which a plurality of blocks are locked in an endless center belt 4, a block 5 is composed of a roughly U-shaped reinforcing material H including a center belt fitting groove 7 having an opening part 6 in one of the V pulley V groove opposite surfaces of both sides of the block 5 and a resin part J coated on a contact surface with the reinforcing material of pulley, and the center of gravity of the block 5 is disposed roughly in the center of a belt width direction.

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 which comprises an elastomer center belt and a block for reinforcing lateral pressure resistance.

[0002]

2. Description of the Related Art Among belt transmissions, particularly when a high load such as a belt type continuously variable transmission must be transmitted, or pulsation of a diesel engine or the like is remarkable, a normal rubber belt is inevitable in terms of life. In some cases, the belt must also be strong enough to withstand high loads.

As a belt for transmitting such a high load, a plurality of blocks made of a material such as resin or resin with metal inserted are fitted in a longitudinal direction of a center belt made of an elastomer having a core body embedded therein. There are types of belts. The center belt is a part that bears tension in the belt longitudinal direction, and a rope core body having high strength and low elongation is used as the core body in the center belt. The block has a trapezoidal shape so as to fit the V groove surface of the pulley for engaging the pulley, and plays a role of reinforcing the lateral pressure from the pulley.

The belt as described above has great rigidity against lateral pressure due to the block having a hardness higher than that of the rubber belt, and the center belt is made of the same rubber as the conventional belt. As a result, it has excellent flexibility in the running direction and exhibits sufficient wear resistance even when used in high-load applications.

Such block-fixed belts include
For example, as disclosed in Japanese Utility Model Laid-Open No. 63-24438, there is a block in which slot portions are provided on both side surfaces and a rubber belt is inserted into the slot portions.

[0006] As another example, the actual exploitation 63-150
There is one in which an upper block and a lower block are fixed to both surfaces of a rubber belt having a core wire embedded therein with a fastening material such as an application bolt or a rivet, as disclosed in Japanese Patent Publication No. 136-136.

However, of the above belts, the former uses two center belts for arranging blocks in the longitudinal direction. Therefore, if the lengths of the two center belts are slightly different from each other, the circumferences of the belts are left and right. When the belt travels and enters the pulley, the belt is inclined and enters, which means that the peripheral speed of the belt is different between the left and the right inside the belt.

[0008] Then, the left and right runnings are misaligned while running. Then, the belt always runs while inclining, the block is unevenly worn, and high transmission efficiency cannot be obtained.

The latter belt is composed of a center belt having teeth and a structure in which two members of an upper block and a lower block are fitted to the teeth and fixed by a fastening material. In this case,
The upper and lower blocks and the center belt are compression-fastened with a fastening material, which makes them more resistant to shearing than the former belt, which allows them to be used in places with high loads. Since it is fixed with a center belt fastening material that uses an elastomer as a matrix, the fastening margin is not constant due to variations in the thickness and hardness of the center belt, and the block fixing strength can vary, and also During the running of the belt, solidification and cracking occurred due to deterioration of the elastomer, and the effect of the fastening material was lost, resulting in loss of the block and lack of reliability.

[0010]

One of such belts is one in which a center belt is fitted in a substantially U-shaped block having a fitting groove on its side surface. Since this belt has only one center belt and does not use a fastening material, running deviation and block loss caused by them do not occur. However, although the block does not come off the center belt where the belt hangs on the pulley, the block may come off at the span portion between the drive pulley and the driven pulley.

Further, since such a block has an asymmetrical shape and the block has a margin to move with respect to the center belt, the block is displaced particularly in the width direction of the belt, and when the belt enters the pulley, It is the cause of pronunciation.

In addition, in order to engage with the convex stripes of the center belt and to fit and incorporate the concave and convex guides, the intervals between the blocks must be made relatively large.
Then, there is a problem that the noise of the belt becomes noticeable. Therefore, an object of the present invention is to provide a block-type high-load transmission belt that prevents the blocks from falling off, stabilizes the running of the belt, does not generate noise, and allows adjacent blocks to be aligned, and is easy to install. To do.

[0013]

In order to achieve such an object, the present invention fits an endless center belt having a core body embedded in an elastomer and the center belt, and is engaged in the longitudinal direction of the center belt. A high load transmission belt composed of a plurality of stopped blocks, wherein the block has a substantially U-shaped reinforcing member having a center belt fitting groove having an opening on one of the V groove facing surfaces of V pulleys on both sides of the block. And a resin portion covering at least the contact surface of the reinforcing member with the pulley, and the center of gravity of the block is arranged substantially at the center in the belt width direction.

Further, the reinforcing material has a thickness in the longitudinal direction of the belt that is large on the opening side of the center belt fitting groove, that the center belt slip-out preventing portion is formed in the opening portion of the block, The front surface has a guide convex portion, and the back surface is provided with a guide hole into which the guide convex portion is fitted. The blocks arranged in the longitudinal direction of the center belt have the positions with openings alternately arranged on the left and right. Those included in the present invention are also included.

[0015]

According to the present invention, in a high load transmission belt in which a plurality of blocks are locked to the center belt, a construction in which a U-shaped block is fitted to one center belt is adopted. Is relatively easy, and there is no concern about transmission loss due to the use of multiple center belts. Further, since the center of gravity of the block is arranged substantially at the center in the belt width direction, the block is prevented from swinging in the left and right directions while the belt is running, and the block is prevented from slipping out and the running of the belt is stabilized. further,
Noise when the belt enters the pulley can also be reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a cross section of a high load transmission belt of the present invention, FIG. 2 is a cross section of a high load transmission belt of the present invention, and FIG. Figure, Figure 4
Is a plan view of the block, and FIG. 5 is a plan view showing another example of the block.

The high-load transmission belt 1 of the present invention comprises a center belt 4 in which a core body 3 is embedded in a spiral shape in an elastomer 2, and a plurality of blocks 5 which are fitted and arranged in the longitudinal direction of the center belt 4. The block 5 is composed of a reinforcing material H made of a metal material and the like, and a resin portion J which covers at least the V groove facing surfaces 5a and 5b of the block 5 that abut the V groove wall surface of the pulley. In addition, the V groove facing surface 5 of the V pulley
5a and 5b of the V-groove facing surfaces, which are substantially U-shaped and have a center belt fitting groove 7 having an opening 6 in one of a and 5b.
Is inclined and has an angle matching the groove angle of the V pulley.

Further, center belt slip-out preventing portions 8 and 9 in which the width of the fitting groove 7 is narrowed in the opening 6 are formed, and a guide convex portion 11 is provided on the front surface 10 of the block 5 and the rear surface 12 is provided. Has a guide hole 13 into which the guide protrusion 11 is fitted.

Further, the center belt 4 has concave portions or convex portions 1 having a constant pitch on at least one of the upper surface and the lower surface.
4 and the fitting groove 7 of the block 5 also has a convex portion or a concave portion 15, and the concave portion or convex portion 14 of the center belt 4 and the convex portion or concave portion 15 of the fitting groove 7 of the block 5 mesh with each other. Block 5 and center belt 4
Is fixed in the belt length direction and removable in the belt width direction.

What is used as the elastomer 2 constituting the center belt 4 is NR (natural rubber),
Disperse unsaturated carboxylic acid metal salts such as SBR (styrene-butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), Hypalon (chlorosulfonated polyethylene), HNBR (hydrogenated nitrile rubber), and zinc methacrylate. A rubber compound such as HNBR or the like having improved strength and a rubber compound made of a blend thereof, a polyurethane resin, or the like.

As the core body 3 embedded in the elastomer 2 in a spiral shape, synthetic fibers such as polyamide, polyester and aramid, or 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 mixture of these fibers, and a woven fabric are used.

Further, the block 5 has a resin portion J on at least the V-groove facing surfaces 5a and 5b of the reinforcing material H made of a metal such as aluminum alloy or stainless steel having a fitting groove for the center belt 4 having an opening on one side surface. The thickness of the reinforcing material H in the longitudinal direction of the belt is different in order to arrange the center of gravity of the block 5 substantially at the center in the width direction of the belt 1. As shown in FIG. 4, the thickness gradually increases from the side without the opening 6 to the direction with the opening 6, and the thickness (M) on the side with the opening> the thickness (M) on the side without the opening ( L). Then, the weight of the opening portion 6 where there is no reinforcing portion is compensated for by the thickness, and the belt 1
The center of gravity is adjusted so that the center of gravity is approximately in the center in the width direction. By doing so, the deflection of the block 5 with respect to the center belt 4 during the running of the belt is reduced, and therefore, even if the block has a U shape as used in the present invention,
The problem that blocks fall off from the center belt 4 and the belt travel becomes unstable is solved.

Further, in FIG. 4, the position of the center of gravity of the block 5 is adjusted by making the thickness of the reinforcing material H asymmetrical in the belt width direction, but the gist of the present invention is to adjust the position of the center of gravity of the block 5 to the belt 1 width. The specific method is not limited to this example, and the upper surface and the lower surface in the opening 6 of the reinforcing member H may be tapered as shown in FIG. The position of the center of gravity may be adjusted. Further, by changing the amount of the resin portion J covering the reinforcing material H between the side having the opening 6 and the side not having the opening 6, or by raising both the reinforcing material H and the resin portion J on the opening 6 side, the center of gravity is increased. It is also possible to adjust the position.

As a simple method for obtaining the position of the center of gravity of the block 5, there is a method of grasping the approximate position by suspending the block 5 with a thread, but for more accurate determination, the block should be a cube or a triangular prism. It is possible to use a method in which the center of gravity Y _i and the volume V _i of each block are divided into the following equations and these are added together by the following formula to determine the center of gravity position Y _{G of the} entire block 5.

[0025]

[Equation 1]

The resin portion J covering the reinforcing material H has a relatively large coefficient of friction and is excellent in wear resistance, and has a higher rigidity than the elastomer 2 constituting the center belt 4, specifically, a hardness of 90 ° JIS. Synthetic resin such as hard rubber of A or more, hard polyurethane resin, liquid crystal resin, phenol resin, epoxy resin, polyamide resin, polyester resin, acrylic resin, methacrylic resin, polyether ether ketone (PEEK) resin, and polytersulphone resin, or , In these resins, cotton fibers, chemical fibers such as polyamide fibers and aramid fibers, glass fibers, metal fibers,
Woven cloth, filler, whiskers made of carbon fiber, etc.
It is made of a reinforced resin mixed with an inorganic material such as silica or calcium carbonate.

Next, the center belt fitting groove 7 of the block 5 is set to be approximately equal to the thickness of the center belt 4,
Center belt slip-out preventing portions 8 and 9 in which the width of the fitting groove is narrowed in the opening portion 6 are formed. Specific examples of the slip-out preventing portions 8 and 9 include a projection having a wall surface that stands substantially vertically on the inside of the groove as shown in FIG. 6, FIG. An example of the protrusion is a taper having a taper downward. The slip-out preventing portion shown in FIG. 7 can be said to be a preferable shape so that the center belt 4 can be easily fitted into the fitting groove 7 when the belt is assembled, and is difficult to slip out once fitted.

The guide protrusions 11 provided on the front surface 10 of the block 5 and the guide holes 13 provided on the back surface 12 are adapted to be fitted in the state where the block 5 is incorporated in the center belt 4, and the belt 1 serves as a pulley. The blocks 5 are aligned on the center belt 4 while being hung and traveling, and noise when entering the pulleys can be suppressed.

As for the block 5, two types of blocks are prepared, one having the opening 6 of the center belt fitting groove on the right side surface and the other on the left side surface. When the block 5 is incorporated into the center belt 4, the right side of the center belt 4 is prepared. By alternately arranging blocks to be incorporated from the left side and blocks to be incorporated from the left side, the weight of the entire belt is balanced, and more stable running is possible.

[0030]

As described above, according to the high load transmission belt of the present invention, the belt can be assembled only by fitting the block into the single center belt, so that the belt can be easily manufactured and the center of gravity of the block can be easily obtained. Since the position of the block is located approximately in the center of the belt width direction, the runout of the block with respect to the center belt can be reduced while the belt is running, preventing the block from falling off, improving the running stability of the block, and making the belt the pulley Also effective in reducing noise when entering.

Further, since the slip-out preventing portion is provided in the center belt fitting groove of the block, the block does not fall off while the belt is running, and the center belt and the block are fitted in the longitudinal direction of the belt. Since the position is fixed by the engagement of the unevenness in the groove and the movement is suppressed in the width direction by the guide convex part and the guide groove, the blocks are aligned on the center belt, and when the center of gravity is adjusted, when the block enters the pulley. It is possible to prevent the generation of noise.

[Brief description of the drawings]

FIG. 1 is a perspective sectional view of essential parts of a high load transmission belt of the present invention.

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

FIG. 3 is a side sectional view of a main part of the high load transmission belt of the present invention.

FIG. 4 is a plan view of a block.

FIG. 5 is a front view showing another example of a block.

FIG. 6 is a front view showing an example of a center belt slip-off preventing portion of a block.

FIG. 7 is a front view showing another example of the center belt slip-out preventing portion of the block.

FIG. 8 is a front view showing still another example of the center belt slip-off preventing portion of the block.

[Explanation of symbols]

 1 High-load transmission belt 2 Elastomer 3 Core body 4 Center belt 5 Block 5a V groove facing surface 5b V groove facing surface 6 Opening 7 Center belt fitting groove 8 Center belt slip-out prevention portion 9 Center belt slip-out prevention portion 10 Front surface 11 Guide Convex part 12 Back surface 13 Guide hole 14 Convex part 15 Recessed part H Reinforcing part J Resin part

Claims (5)

[Claims] 1. A high load transmission belt comprising an endless center belt having a core body embedded in an elastomer, and a plurality of blocks fitted to the center belt and locked in the longitudinal direction of the center belt, wherein the blocks are: A substantially U-shaped reinforcing member having a center belt fitting groove having an opening on one of the V groove facing surfaces of the V pulleys on both sides of the block, and a resin portion coated on at least the contact surface of the reinforcing member with the pulley. And a center of gravity of the block is arranged substantially in the center of the belt width direction, which is a high load transmission belt. 2. The high load transmission belt according to claim 1, wherein the reinforcing member has a thickness in the longitudinal direction of the belt that is increased on the opening side of the center belt fitting groove. 3. The high load transmission belt according to claim 1, wherein a center belt slip-off preventing portion is formed in the opening of the block. 4. The front of the block has a guide protrusion,
The high load transmission belt according to claim 1, wherein a guide hole into which the guide protrusion is fitted is provided on the back surface. 5. The high load transmission belt according to claim 1, wherein the blocks arranged in the longitudinal direction of the center belt are arranged such that the positions having openings are alternately arranged on the left and right.