JPH10159910A - Heavy load transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heavy load transmission belt in which torsion of the belt does not occur and further a center belt and a block are easily fixed. SOLUTION: In a heavy load transmission belt 1 in which plural blocks 5 are fitted on and engagingly locked to a center belt 4, a pair of pulley-abutting parts 6, 7 are integrally connected to a pair of connecting members 8, 9 to form a fitting groove surrounded by the pulley-abutting parts and the connecting members in the block 5. The fitting groove has an opening part for inserting the center belt 4 into the pulley-abutting parts, and the opening part is provided at a position which is shifted from the center belt so that the loaded center belt is not slipped off.

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, a belt is disclosed in Japanese Patent Publication No. 62-7418, in which slots are provided on both sides of a block, and a rubber tension member is inserted into the slot. There is.

[0006] Since this belt has a structure in which a tension member is inserted into the block for fixing and is fitted and fixed, it is compared with a belt in which the block and the tension member are fixed using a fastening material, for example. Can be reduced in thickness. 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]
In the belt disclosed in Japanese Patent No. 7418, an upper beam portion 31 and a lower beam portion 32 are connected by a center pillar 33 as shown in the cross section in FIG. The fitting groove 3 of the block 30 having
This is a belt of a type in which a center belt 35 is fitted to 4, 34. In addition, the center pillar 33 has a guide projection 36 at the center thereof for aligning the front and rear blocks.

In the case of this type of belt, since the center belt is inserted from the side, the groove for inserting the center belt is opened on the side of the center belt where the most efficient transmission force can be obtained. However, there is a disadvantage that power cannot be transferred at that portion. In addition, since there are two center belts, when a misalignment travel is inevitable with a speed change belt, the belt is twisted and only one belt can take tension, resulting in a decrease in power transmission efficiency. There is also a problem of being connected or disconnected.

In view of this, the upper beam portion 41 and the lower beam portion 42 of the block 40 shown in FIG. If a belt having approximately U-shaped blocks fitted alternately on the left and right is used, the center belt is one, so that the above-mentioned problem of the belt being twisted is eliminated, and the groove for fitting the center belt 44 is also opened on only one side. As a result, the problem that the area of the side of the center belt becomes small can be covered to some extent.

However, since the area of the pulley contact surface of the block 40 having a substantially U-shape in contact with the V groove of the pulley is different between the left and right sides, 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 40 skews in the running direction.

Further, the upper and lower beam portions 41 and 42 are opened by the moment force applied to the opening for inserting the center belt 44 on the side surface, so that the block is damaged or the block is detached from the center belt 44. There is.

Further, in order to align the blocks 40 in the longitudinal direction of the belt, for example, a guide fitting portion including a convex portion 45 on the front surface and a concave portion on the rear surface of the block is provided, and the blocks located at the front and rear are fitted into the concave and convex. But the center belt 4
4 has an opening in the lateral direction, the position where the convex portion 45 and the concave portion are provided must be located on the upper beam portion 41 or the lower beam portion 42 of the block. In this case, there is a problem that the relative movement between the convex portion and the concave portion is large and the degree of abrasion is also large because the position of the concave / convex fitting is largely deviated from the pitch line where the center belt exists. For this reason, the transmission force and durability may be reduced more than a belt having a groove into which the center belt is inserted on both side surfaces.

Therefore, according to the present invention, a single center belt does not cause twisting of the belt, and can receive a side pressure from a pulley on a side of the center belt. The purpose of the present invention is to provide a high-load transmission belt in which the front and rear blocks are fitted to each other, so that the unevenness is less abraded, and the center belt and the block are easily fixed and are not easily detached.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, there is provided an endless center belt having a core wire embedded in an elastomer, and a V-groove of a pulley provided in the center belt. In a high-load transmission belt having a configuration in which a plurality of blocks having inclined pulley contact surfaces to be engaged are fitted and locked, the block includes a pair of pulley contact portions including a pulley contact surface with a pair of connecting members. Integrally connected to form a fitting groove surrounded by the pair of pulley contact portions and the pair of connecting members, the fitting groove being an opening for fitting a center belt into one pulley contact portion. And the opening is provided at a position shifted from the center belt.

By adopting such a structure, the center belt can be reduced to one and the thickness of the block can be reduced. In addition, the mounting of the center belt to the block is relatively easy, and once the center belt is mounted. The center belt does not come off easily.

According to a second aspect of the present invention, a guide portion for aligning the front and rear blocks is provided substantially on the side of the center belt attached to the fitting groove of the pulley contact portion, so that the position of the guide portion is equal to that of the belt. Since the guide portion is almost at the position of the pitch line, the movement of the guide portion is small and abrasion hardly occurs, so that the function of aligning the blocks can be performed for a long period of time.

[0017]

FIG. 1 is a perspective view of a high load transmission belt of the present invention, and FIG. 2 is a perspective view of a block main body of the high load transmission belt of the present invention.

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 two side surfaces of the block 5 have inclined pulley contact surfaces 5a which engage with the V-grooves of the pulley,
5b, which receives the power from the driven pulley and transmits the power to the driven pulley via a center belt locked and fixed to the block 5.

The block 5 has a pair of connecting members 8 and 9 for integrally connecting lower ends and upper ends of a pair of pulley contact portions 6 and 7 as shown in FIG. ,
A fitting groove 10 surrounded by 7 and a pair of connecting members 8 and 9 is provided. The fitting groove 10 has a pair of pulley contact portions 6 and 7.
The opening 11 is opened at a position shifted from the position of the center belt 4. In the example of FIG. 2, an obliquely upward cut 12 is made in the upper connecting member 8 from the end of the fitting groove 10, and when it reaches a position shifted from the fitting groove 10, it continues to reach the opening 11 in the lateral direction. Extending. The opening 11 is located at a position in the fitting groove 10 that is shifted upward by a thickness of the center belt 4 as compared with the center belt 4.

By shifting the position of the opening 11 from the position of the center belt 4 in this manner, the center belt 4 once attached is prevented from easily coming off.

The pulley contact surface 5a extends from below the block 5 to the opening 11, and the portion corresponding to the side surface of the connecting member 8 does not contact the pulley.
This is to prevent the opening 11 from opening due to the force from the pulley applied to the connecting member 8. Also, the pulley contact surface 5b on the opposite side without the opening 11
At the same time, the inclination angle is raised upward so as not to come into contact with the pulley, and the right and left sides are balanced. The block 5 has a configuration in which at least the pulley contact surfaces 5a and 5b of the reinforcing member 13 made of metal that contact the pulleys are covered with the resin portion 14.

When assembling the high-load transmission belt, the center belt 4 is connected to the opening 1 as shown in FIG.
1, the belt can be relatively easily assembled. In order to balance the weight of the belt on the left and right sides, a block 5 having an opening 11 on the right side and a block 5 'having an opening 11' on the left side are mounted on alternate center belts 4.

As shown in FIG. 5, the block 5 has a convex portion 15 and a concave portion on the rear surface of the pulley contact portions 6 and 7 at positions substantially at the same height as the core wire 2 of the center belt 4 on the front surface of the block. A guide portion comprising a convex portion 15 and a concave portion 16 is provided.
Are fitted, and the movement of the adjacent blocks is regulated to serve as a guide for aligning the blocks. Further, the convex portion 15 and the concave portion 16 are curved surfaces so that the belt is not worn even when the angle between the adjacent block and the adjacent block changes due to the bending of the belt.

By fitting the guide portion including the convex portion 15 and the concave portion 16 as described above, the blocks can be aligned in the longitudinal direction of the belt, and the block collides with the pulley when the belt enters the pulley. It is possible to prevent a collision sound generated due to the operation. Further, by providing the guide portion at the center of the pulley contact portions 6 and 7, the guide portion can be arranged on the pitch line substantially at the same height as the core wire 3 of the center belt 4 on the side of the center belt 4. This is a place where the relative movement of the adjacent blocks is the least, and it can be said that the abrasion of the convex part and the concave part is less than when provided in another place.

The lower half of the pulley contact portions 6, 7 on the front surface of the block 5 from the vicinity of the center in the vertical direction is connected with connecting members 8, 9,
When the belt enters the pulley and bends, the front and rear blocks do not contact each other at the front and back sides. Further, as shown in the cross section in FIG. 4, the lower surface of the connecting member 8 in the fitting groove 10 and the upper surface of the connecting member 9 form ridges 8a, 9a, and the grooves on the upper surface and the lower surface of the center belt 4 are formed. It engages with the ridges 4a, 4b.

As the elastomer 2 constituting the center belt 4, 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.

The core 3 embedded spirally in the elastomer 2 may be 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 has a structure in which the entire surface of a metal reinforcing member 13 is covered with a resin portion 14. The resin portion 14 contacts at least the pulley. It is necessary to provide them at portions corresponding to the pulley contact surfaces 5a and 5b. For example, a material in which only the pulley contact portions 6 and 7 of the reinforcing member 13 are covered with the resin portion 14 can be used.

At least the pulley contact surface 5 of the reinforcing member 13
The resin portion 14 covering the a and 5b has a relatively large coefficient of friction and excellent wear resistance, and has a higher rigidity than the elastomer 2 constituting the center belt 4, specifically, a hardness of 90 ° JIS A or more. Hard rubber, hard polyurethane resin, liquid crystal resin, phenolic resin, epoxy resin, polyamide resin, polyester resin, acrylic resin, methacrylic resin, polyetheretherketone (PEEK)
A synthetic resin such as a resin is used.

In these resins, synthetic fibers such as cotton yarns, polyamide fibers and aramid fibers, woven fabrics made of glass fibers, metal fibers, carbon fibers, etc., fillers, whiskers, silica, inorganic materials such as calcium carbonate, etc. Reinforced resin mixed with

[0031]

Next, a test was conducted to measure the transmission and noise by actually running the belt of the present invention. As an example,
A high-load transmission belt according to the present invention having the structure shown in FIG. 1 and using a belt provided with a guide fitting portion substantially at the center of the side portion and substantially at the pitch line side of the center belt.

As a comparative example, a belt having an opening on the side of the fitting groove as shown in FIG. 7 and a guide portion provided on the upper connecting member was used. The driving conditions are as follows: the driving pulley has a pitch diameter of 65 mm and a rotation speed of 320 as summarized in Table 1.
At 0 rpm, the pitch diameter of the driven pulley was 130 mm, the number of revolutions was 1600 rpm, the ambient temperature was 90 ° C., and the load was 4 kgfm on the driving side and 8 kgfm on the driven side.
The slip ratio of each belt at a torque of 4 kgfm, the sound pressure during running, and the time to life were measured. Table 2 shows the results.

[0033]

[Table 1]

[0034]

[Table 2]

As can be seen from the results in Table 2, the slip ratio is about half and the sound pressure is smaller in the example than in the comparative example, and the guide portion is arranged at the position of the center line of the center belt. It can be seen that the blocks are well aligned and the belt runs more efficiently. Also, as for the life time, the comparative example has reached the end of the life of 260 hours, whereas the example has not reached the end of the life even after running for 400 hours. It can be seen that the alignment of the belt has been performed for a short period of time.

[0036]

As described above, according to the high load transmission belt of the present invention, according to the first aspect, a plurality of blocks having an inclined pulley contact surface which engages with a V groove of a pulley are fitted to a center belt. In the high load transmission belt having the above-described configuration, the pair of pulley contact portions are integrally connected by a pair of connecting members to form a fitting groove surrounded by the pair of pulley contact portions and the pair of connecting members. The fitting groove has an opening for fitting the center belt into one of the pulley contact portions, and the opening is provided at a position shifted from the center belt so that the mounted center belt does not come off. It is characterized by having.

By adopting such a configuration, the center belt can be integrated into a single belt, so that the belt is not twisted during running and the thickness of the block can be reduced, so that the pitch noise during running can be reduced. In addition, the mounting of the center belt on the block is relatively simple, and the center belt once mounted does not easily come off.

According to the second aspect of the present invention, the guide portion for aligning the front and rear blocks is provided substantially on the side of the center belt attached to the fitting groove of the pulley contact portion. Since the guide portion is almost at the position of the pitch line, the movement of the guide portion is small and abrasion hardly occurs, so that the function of aligning the blocks can be performed for a long period of time.

[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 perspective view of a block.

FIG. 3 is a cross-sectional view of a main part where a locking member is mounted on the block body.

FIG. 4 is a longitudinal sectional view of the high-load transmission belt at a fitting groove position.

FIG. 5 is a vertical cross-sectional view at the position of a guide convex portion.

FIG. 6 is a sectional view of a conventional belt.

FIG. 7 is a cross-sectional view of a conventional belt.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 Core 4 Center belt 5 Block 6 Pulley contact part 7 Pulley contact part 8 Connecting member 9 Connecting member 10 Fitting groove 11 Opening 12 Cut 13 Reinforcement part 14 Resin part 15 Convex part 16 Recess

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

Claims (2)

[Claims] An endless center belt having a core embedded in an elastomer, and a plurality of blocks having an inclined pulley contact surface engaged with a V-groove of a pulley on the center belt are fitted and locked. In the high load transmission belt, the block is integrally connected to a pair of pulley contact portions including a pulley contact surface by a pair of connection members, and is surrounded by the pair of pulley contact portions and the pair of connection members. A fitting groove is formed, and the fitting groove has an opening for fitting the center belt into one of the pulley contact portions, and the opening is provided at a position shifted from the center belt. And high load transmission belt. 2. The high-load transmission belt according to claim 1, further comprising a guide portion for aligning the front and rear blocks on substantially the side of the center belt mounted in the fitting groove of the pulley contact portion.