JPH11125316A - Belt driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently transmit power by effectively using the whole surface of a pulley abut part by setting the angle formed by the side surfaces at a pair of pulley abut parts of a block larger than the V-groove angle of the pulley. SOLUTION: A belt 1 is provided with plural blocks 5 fitted in the longitudinal direction of two center belts 4, 4 formed by burying a core wire 3 in an elastomer 2, and lock parts 11, 12 extended from the upper ends of a pair of pulley abut parts 6, 7 to the inner surface side of a fitting groove are disposed opposite to each other. The angle θ1 made by both side surfaces 5a, 5b of the block 5 is set a little larger than the V-groove angle θ made by sheaves 20a, 20b. Accordingly, at the time of load, the belt is subjected to side pressure from the pulley 20 by tension of the center belts 4, 4', and the pulley contact parts 6, 7 and the connecting member 8 itself are bent inward. Thus, the block angle θ1 and the V-groove angle match so that the side pressure is received substantially uniformly by the whole of the side surfaces so as to efficiently transmit power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt driving device using a high-load transmission belt including a center belt made of an elastomer and a block for reinforcing a 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 proposed as belts applied to applications requiring high load transmission, such as continuously variable transmissions. Have been.

However, the rubber V-belt has a maximum surface pressure of about 10 kg / cm 2 even for a high-load type, and the rubber V-belt cannot withstand a high side pressure if the torque is more than that. Buckling deformation occurs.

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.

[0005] In such a belt, the block shape forms a center belt fitting groove which is surrounded on three sides by a pair of pulley contact portions and a connecting member connecting the pulley contact portions,
The present inventors have proposed a high-load transmission belt using a block in which a lock portion is formed so that the center belt does not come off on the opposite side of the pulley contact portion connected by the connection member.

[0006]

However, in the block, the fitting groove of the center belt is opened upward, and when such a belt is run by hanging on a pulley, the side pressure from the pulley causes the belt to run. A phenomenon occurs in which the block bends relatively easily in the direction in which the opening of the fitting groove closes.
For this reason, even when a side pressure is applied from the pulley at the block pulley contact portion, the upper half of the block does not generate much stress, and the lower half of the block contributes to transmission. A situation has occurred.

Accordingly, an object of the present invention is to provide a belt drive device capable of efficiently transmitting power by effectively using the entire surface of a pulley contact portion even with a high-load transmission belt having such a configuration. I do.

[0008]

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 side surface which engages a V groove of a pulley. A plurality of blocks having a pulley contacting portion having a plurality of blocks are engaged with each other by engaging a high-load transmission belt engaged with a pulley to transmit power, wherein the block connects a pair of pulley contacting portions to a connecting member. Connected together with
The pair of pulley contact portions and the connecting member form a fitting groove surrounded on three sides, and the inner side of the fitting groove from the pulley contact portion so that the center belt attached to the fitting groove does not come off. , And the angle formed by the side surfaces of the pair of pulley contact portions of the block is set to be larger than the V groove angle of the pulley.

By doing so, the angle formed by the pulley abutting portion and the V-groove angle of the pulley almost coincide with each other in a state where the block is bent by the lateral pressure from the pulley, and the entire surface of the pulley abutting portion is formed. Since the lateral pressure from the pulley can be received, more efficient power transmission can be performed.

In the present invention, the difference between the angle formed by the pair of pulley contact portions and the angle formed by both sheaves of the pulley is in the range of 1/10 to 1/5 °. By setting the range, the engagement between the block and the pulley can be more accurately engaged, and more efficient power transmission can be realized.

[0011]

1 and 2 are sectional views of a belt driving device according to the present invention, FIG. 3 is a perspective view of a main part of a high-load transmission belt of the present invention, and FIG. 4 is a front view of a block.

As shown in FIG. 3, the high-load transmission belt 1 of the present invention comprises two center belts 4 and 4 'having the same width and 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. Both side surfaces 5a and 5b of the block 5 are inclined surfaces to be engaged with the V-grooves of the pulley, receive power from the driven pulley, and are driven by a center belt locked and fixed to the block 5. Power is transmitted to the pulley on the side.

The block 5 has a pair of connecting members 8 for integrally connecting the lower ends of the pair of pulley contact portions 6, 7 as shown in FIG. Member 8
Has a fitting groove 9 surrounded on three sides, and an opening 10 is open upward. Then, a lock portion 11, which extends from the upper ends of the pair of pulley contact portions 6, 7 toward the inner surface of the fitting groove 9,
12 are provided so as to face each other. The fitting groove 9 is opened upward, and the center belt 4,
4 'is attached, and after the attachment, the lock portions 11, 12 are attached.
Is locked out.

FIG. 1 is a cross-sectional view of the belt driving device of the present invention. In the present invention, both side surfaces 5a of the block,
5b forms an angle θ1 between the two sheaves 20 of the pulley 20.
The angle is set slightly larger than the V-groove angle θ2 formed by a and 20b. By doing so, when the belt 1 is applied to the pulley 20, the belt is pressed downward by the tension of the center belts 4, 4 'and receives a lateral pressure from the pulley 20 (stress as indicated by an arrow in the drawing). 2), the pulley contact portions 6, 7 and the connecting member 8 themselves bend as shown in FIG.

As a result of bending, the angle θ1 formed by the two side surfaces 5a and 5b of the block and the V groove angle θ of the pulley
2 and the lateral pressure from the pulley can be almost uniformly received on the entire side surface, so that efficient power transfer between the pulley and the belt can be performed.

As described above, in order to effectively exert the effect, the difference between θ1 and θ2 must be 1/10 to 1/5.
It is preferably within the range of °. When the angle is larger than 1/5 °, the angle θ1 formed by the block side surfaces 5a and 5b is larger than the V of the pulley 20 even when the block is bent.
It becomes too large than the groove angle θ2, and the side surface 5 of the block
Since a portion that does not come into contact with the pulley comes out below a and 5b, power transmission efficiency is reduced, and only the upper portions of the side surfaces 5a and 5b of the block are worn, and the pulley contact portions 6, 7 and the connecting member 8 are not worn. This is not preferable because excessive stress may be concentrated on the boundary portion of the wire, leading to breakage.

When the angle is smaller than 1/10 °, the pulley 2
When the block is bent by the side pressure from 0, the angle θ1 of the side surface of the block is smaller than the V-groove angle θ2, so that it cannot follow the pulley, and the power transmission efficiency is deteriorated.

As the elastomer 2 constituting the center belts 4 and 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 single rubber material such as BR or a rubber compound or a polyurethane resin composed of a blend thereof can be used.
In the drawings, an example in which two center belts are used is described, but one center belt may be used.

The cords 3 and 3 'spirally embedded in the elastomer 2 are polyamide, polyester,
A cord made of a synthetic fiber such as aramid or an inorganic fiber such as a steel cord, a glass fiber cord, or a carbon fiber cord, a twisted cord or a woven fabric made of a blend of these are used.

The center belt 4 once worn is
The lock portions 11 and 12 prevent the block 5 from coming off.

As shown in FIG. 5, the block 5 is provided with pulley contact portions 6 and 7 which are substantially center belts 4 on the front surface of the block.
A guide portion comprising a convex portion 15 and a concave portion 16 on the back surface is provided at a position substantially at the same height as the core wire 2.
6 are fitted, and the movement of adjacent blocks restricts the movement and serves as a guide for aligning the blocks. Also,
The convex portion 15 and the concave portion 16 are curved surfaces so that they are not worn even when the angle between adjacent blocks is changed due to the bending of the belt.

By fitting the guide portion consisting of 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. By doing so, it is possible to prevent the collision noise generated. 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 front surface of the block 5 from the vicinity of the center in the vertical direction of the pulley contact portions 6, 7 is an inclined surface including the connecting member 8, and when the belt enters the pulley and is bent, the front and rear portions are inclined. Blocks do not touch each other between the front and back. Further, as shown in the cross section in FIG. 6, a convex ridge 8a is formed on the upper surface of the connecting member 8 in the fitting groove 9 so as to mesh with the groove 4a on the lower surface of the center belt 4. ing.

The resin portion 14 must be provided at least at a portion corresponding to the pulley contact surfaces 5a and 5b which come into contact with the pulley, and as shown in FIG.
Is configured by covering a portion corresponding to a pulley contact portion of a metal reinforcing member 13 and a portion corresponding to a connecting member with a resin portion 14. For example, the entire surface of the reinforcing member 13 is formed of a resin portion. 14 can be used. And
As shown in FIG. 7, the resin portion 14 may form the protruding portions 17 on the lower surfaces of the lock portions 11 and 12, and may be fitted with the groove portions 4 b provided on the upper surface of the center belt 4. The fixing strength between the belt 5 and the center belt 4 is increased.

The reinforcing material 13 constituting the block 5 is an insert which serves as a portion for imparting the side pressure resistance and the bending rigidity of the block. Examples of the material include a metal such as an aluminum alloy and iron. The present invention does not depart from the gist of the present invention even if a resin reinforced with a woven fabric of carbon fiber or aramid fiber or a resin having sufficient strength is used.

However, a metal material is excellent in terms of imparting lateral pressure resistance and bending rigidity, and it is preferable to use a block in which a predetermined portion of a metal reinforcing material is coated with a resin 14.

In the case where the resin 14 is disposed at a predetermined location, if the resin 14 is used, the entire surface of which is covered with the resin 14 using a reinforcing material 13 which is slightly smaller than the size of the block, the resin 14 is partially used. This is a preferable embodiment since problems such as resin peeling are less likely to occur than those in which the cover is disposed. However, even if the entire surface is contacted by a member for fixing the reinforcing material 13 when the resin 14 is coated in the manufacturing process, a portion where the reinforcing material 13 is exposed is generated. The degree of exposure of the reinforcing material 13 may be included in a form in which the entire surface is substantially covered with the resin.

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

[0030]

Next, a test was conducted to compare the transmission of the belt of the present invention by actually running the belt. An example is a high-load transmission belt having the structure shown in FIG. 3, in which the angle formed by the two side faces is larger than the V-groove angle of the pulley and is within a predetermined range (26 + 1/7) °. Was used.
Comparative Example 1 is a belt having the same structure as the example,
A belt of (26 + ／) ° in which the angle formed by the two side surfaces was larger than the V-groove angle of the pulley was used. As Comparative Example 2, a belt of (26 + 0) ° in which the angle formed by the two side surfaces was the same as the V-groove angle of the pulley was used. As Comparative Example 3, a belt whose angle formed by the two side surfaces was (26-／) ° smaller than the V-groove angle of the pulley was used.

The belts of these Examples and Comparative Examples 1 to 3 were run while being suspended on a belt driving device in which the V groove angle of the driving pulley was 26 °. The running conditions are as follows: the pitch diameter of the driving pulley is 65 mm and the rotation speed is 3200 rpm; the pitch diameter of the driven pulley is 130 mm and the rotation speed is 1600 r.
pm, ambient temperature is 90 ° C, load is 4k on drive side
gfm, and the driven side was 10 kgfm. The slip ratio of each belt at a torque of 5 kgfm, the sound pressure during running, and the time to life were measured. Table 1 shows the difference between the angle of the side surface of each block and the angle of the V-groove, and the test results.

[0032]

[Table 1]

As can be seen from the results in Table 1, Comparative Example 1 has a large slip ratio and wear occurs only in the lower half of the block. Comparative Example 2 is Comparative Example 1 in terms of slip ratio.
Although it is better than that, the wear of the block also shows much lower half wear.

In Comparative Example 3, the slip ratio was worse than that in Comparative Example 2, and the wear of the block occurred in the upper half, and the block was damaged by buckling, and the life was shortened.
As compared with the comparative examples 1 to 3, the example has a small slip ratio, and the state of the block side surface immediately after the start of traveling is in a state where the entire surface is uniformly worn.

[0035]

As described above, the high-load transmission belt according to the present invention is characterized in that, in the belt driving device in which the belt fixed to the center belt is suspended on the pulley, the block has an opening at the upper side. The angle formed by the two side surfaces of the pair of pulley contact portions is set to be larger than the V-groove angle of the pulley.

By adopting such a configuration, the pressure applied from the V-groove of the pulley to the side surface of the block becomes constant, and efficient power transmission becomes possible, and the wear on the side surface of the block becomes uniform, so that the belt length is reduced. It also leads to longer life.

In the present invention, the difference between the angle formed by the two side surfaces and the angle of the V-groove of the pulley is in the range of 1/10 to 1/5 °. By setting the range, the engagement between the block and the pulley is more accurately engaged, and more efficient power transmission can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of a belt driving device according to the present invention.

FIG. 2 is a cross-sectional view of the belt driving device where a block is bent.

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

FIG. 4 is a front view of the block.

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

FIG. 6 is a longitudinal sectional view of the high-load transmission belt at a fitting groove position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 core wire 3 'core wire 4 Center belt 4' Center belt 5 Block 5a Side surface 5b Side surface 6 Pulley contact portion 7 Pulley contact portion 8 Connecting member 9 Fitting groove 10 Opening 11 Lock portion DESCRIPTION OF SYMBOLS 12 Lock part 13 Reinforcement part 14 Resin part 15 Convex part 16 Concave part 20 Pulley

Claims (2)

[Claims] 1. A high-load transmission belt in which a plurality of blocks having a pulley contact portion engaging with a V-groove of a pulley is fitted to an endless center belt having a core wire embedded in an elastomer, and a high-load transmission belt is fitted to the pulley. In the belt driving device that transmits power by engaging, the block integrally connects a pair of pulley contact portions with a connecting member, and a fitting groove surrounded on three sides by the pair of pulley contact portions and the connecting member. A block having a pair of lock portions extending from the pulley contact portion to the inner surface side of the fitting groove so that the center belt attached to the fitting groove does not come off, and two side surfaces of the block. Wherein the angle formed by is set larger than the V-groove angle of the pulley. 2. The angle formed by the two sides and the V of the pulley.
2. The belt driving device according to claim 1, wherein a difference between groove angles is in a range of 1/10 to 1/5 [deg.].