JPH11247947A - High load transmission belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate large pressure between a pulley and a block by interposing a support member to prevent the block from deflecting inward by lateral pressure, between the mutual two lock parts to prevent slipping-out of a center belt. SOLUTION: A block 5 forms a fitting groove having three sides surrounded by the beam part 6 and side pillars 7, 8 by extending a pair of side pillars 7, 8 upward from both ends of the beam part 6. In the fitting groove, the opening part opens in the upper part, and the lock parts 11, 12 extending toward the inside surface side of the fitting groove from the upper end of a pair of side pillars 7, 8 are oppositely arranged. A center belt 4 is installed in the fitting groove from the opening part opening in the upper part, but does not slip out by the lock parts 11, 12 after installation. A support member is installed in the opening part after installing the center belt 4 to prevent slipping-out of the center belt 4 as well as to support the lock parts 11, 12 so that the block 5 does not deflect inward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-load transmission belt comprising 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, a rubber V-belt has a maximum surface pressure of about 10 kg / cm ² even for a high-load one, and if the torque is more than that, the rubber V-belt can withstand a high lateral pressure. 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 shape of the block forms a center belt fitting groove surrounded on three sides by a pair of pulley contact portions and a beam portion connecting the pulley contact portions,
A lock portion is formed on the opposite side of the pulley abutment portion connected by the beam portion so that the center belt does not come off, and a protrusion provided on the beam portion and the lock portion and a groove provided on the center belt are formed. The present inventors have proposed a high-load transmission belt that fits and transmits power by the fitting.

[0006]

However, in the block, the fitting groove of the center belt has an open portion in an upward direction. When such a belt is run on a pulley, the block becomes Because it has an opening only in the upward direction, the beam part is bent (dishing) and the side pillar is blocked by the force of sinking into the pulley under the tension of the center belt and the side pressure received from the pulley. Is pressed inward to bend in the direction in which the opening of the fitting groove closes.

[0007] In this case, a large pressure is not generated between the pulley and the block particularly at the upper portion of the side pillar, and the transmission force at that portion cannot be expected. When the block is bent, the lock portion moves together with the other portions and changes its direction downward with respect to the horizontal direction. If so, the lock portion will bite into the center belt, causing unnecessary stress to reduce the power transmission performance due to the fitting of the lock portion and the center belt, and in some cases, breakage of the block. Or breakage of the center belt.

Accordingly, in the present invention, in the high-load transmission belt having such a configuration, the block is not bent even by the force received from the center belt and the side pressure from the pulley.
A large pressure can be generated between the pulley and the block, and the lock part abuts the center belt with moderate and even stress, maintaining good power transmission performance and preventing breakage of the block and center belt. The purpose is to provide a high-load transmission belt.

[0009]

According to the present invention, in order to achieve the above object, a center belt,
The center belt includes a plurality of blocks fitted and arranged in the longitudinal direction, and the block includes a beam portion and two side pillars extending upward from both ends of the beam portion. Has a lock portion to prevent the center belt from coming off,
A support member for preventing the block from bending inward due to lateral pressure is interposed between the two lock portions.

[0010] By adopting such a configuration, the block does not bend because the block enters the pulley during traveling of the belt and is supported by the support member even when the block receives the side pressure from the pulley. A large pressure can be generated between the blocks, the lock does not bite into the center belt, a large transmission force can be obtained, and a long-life belt that prevents breakage of the block and center belt Can be provided.

According to a second aspect of the present invention, the contact surface between the lock portion and the support member is formed by a curved surface having a convex portion on the lock portion side.
The lock portion is movable with respect to the support member in the belt traveling direction. By adopting such a configuration, even if the lock portion is twisted to move in the belt traveling direction,
The stress is not concentrated on the support member and its vicinity, and the breakage of the block can be prevented.

[0012]

FIG. 1 is a perspective view of a main part of a high-load transmission belt according to the present invention, and FIG. 2 is a front view of a block. As shown in FIG. 1, a high-load transmission belt 1 according to the present invention has two center belts 4 having the same width in which a core wire 3 is spirally embedded in an elastomer 2, and a plurality of center belts 4 are fitted in the longitudinal direction of the center belt 4. It consists of blocks 5 to be arranged. 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 includes a pair of side pillars 7 and 8 extending upward from both ends of the beam portion 6 as shown in FIG.
Extends to form a fitting groove 9 surrounded on three sides by the beam portion 6 and the side pillars 7 and 8. The fitting groove 9 has an opening 10 opened upward, and a pair of side pillars 7,
Lock portions 11 and 12 extending from the upper end of 8 toward the inner surface of the fitting groove 9 are provided so as to face each other.

The fitting groove 9 has an opening 10 opening upward.
, The center belt 4 is attached, but after the attachment, the lock portions 11 and 12 prevent the center belt 4 from coming off.
And the opening 10 after the center belt 4 is attached
A support member 13 is mounted on the center belt 4.
The lock portions 11 and 12 are supported so that the block 5 does not bend inward due to the side pressure received from the pulley when the belt of FIG.

In the case of a block with the opening 10 left open, the problem of bending is unavoidable, and a large pressure cannot be generated between the side surface of the block and the pulley, which also affects the transmission force of the belt. However, by arranging the support member 13 as described above, a sufficiently large pressure can be generated, so that a large transmission force can be expected.

The support member 13 and the lock portions 11 and 12 of the block are fitted into one of the grooves 1 in the longitudinal direction of the belt in order to prevent the support member from coming off in the vertical direction.
On the other side, there is provided a projection 15 fitted on the other side. The lock portions 11 and 12 are formed on convex curved surfaces 16 and 17 that can be turned in the belt longitudinal direction with respect to the support member 13, while the support member 13 has the convex curved surfaces 16 and 17.
The concave curved surfaces 18 and 19 are provided. By doing so, it is possible to prevent the problem that stress concentrates on a specific portion of the support member 13 and breaks even when a force that twists the block is applied during running of the belt as shown in FIG. Can be said to be a preferable form.

As will be described later in detail with reference to FIG. 7, the block 5 and the center belt 4 are engaged with each other by protrusions provided on the beam portion 6 and the lock portions 11 and 12 and grooves provided on the center belt 4. The block 5 is configured not to move in the belt longitudinal direction with respect to the center belt 4 due to the shearing force of that portion, and power is transmitted. Also, the support member 13 can be prevented from falling off by providing the convex portion 13a on the surface that comes into contact with the center belt 4 and engaging with the groove of the center belt 4.

As shown in FIG. 5, the block 5 includes a reinforcing material 2
The resin material 21 is partially or wholly coated on the surface of the resin material 21. The reinforcing material 20 is an insert serving as a part for imparting lateral pressure resistance and bending rigidity of the block. Metal. While the elastic modulus of an aluminum alloy is 7000 kgf / mm2 and the specific gravity is 2.8, iron has an elastic modulus of 22000 kgf / mm2 and a specific gravity of 7.8. Use is more advantageous, but iron is higher in strength. In addition, the same material as the resin material 21 or a resin reinforced with a woven fabric of carbon fiber or aramid fiber, a scum, etc. and having sufficient strength may be 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 material 21.

When the resin material 21 is arranged at a predetermined position,
When a reinforcing material 20 made of a metal material slightly smaller than the size of the block is used and the entire surface thereof is covered with the resin material 21, the peeling of the resin is smaller than that in the case where the resin material 21 is partially covered. Such a problem is unlikely to occur, so it can be said to be a preferable mode. However, even though the entire surface is in contact with the member for fixing the reinforcing material 20 when the resin material 21 is coated in the manufacturing process, a portion where the reinforcing material 20 is exposed occurs, Such exposure of the reinforcing member 20 can be said to be included in a form in which the entire surface is substantially covered with the resin.

The resin material 21 covering the reinforcing material 20 has a relatively large friction coefficient and excellent wear resistance, and has a higher rigidity than the elastomer 2 forming the center belt 4, specifically, a hardness of 90 ° JIS. A or more hard rubber,
A synthetic resin such as a hard polyurethane resin, a liquid crystal resin, a phenol resin, an epoxy resin, a polyamide resin, a polyester resin, an acrylic resin, a methacryl resin, and a polyetheretherketone (PEEK) 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 The support member 13 is made of a resin having excellent wear resistance, and the same resin material as the resin material 21 of the block 5 can be used as a resin material.

As the elastomer 2 constituting the center belt 4, NR (natural rubber), SBR
(Styrene / butadiene rubber), CR (chloroprene rubber), NBR (nitrile rubber), Hypalone (chlorosulfonated polyethylene), HNBR (hydrogenated nitrile rubber), and rubber such as HNBR containing unsaturated metal salts of carboxylic acid. One material, a rubber compound comprising these blends, a polyurethane resin, and the like. In the drawings, an example in which two center belts are used is described.
A book may be used.

The core wire 3 embedded spirally in the elastomer 2 may be a synthetic fiber such as polyamide, polyester, or aramid, or a cord made of a simple substance of inorganic fiber such as steel cord, glass fiber cord, carbon fiber cord, or the like. A woven cord or a woven fabric composed of a blend of the above.

As shown in FIG. 6, the block 5 has the side pillars 7 and 8 at positions substantially at the same height as the core wire 2 of the center belt 4 at the front of the block, and the recess 23 at the back.
The convex portion 22 and the concave portion 23 are fitted to each other, and the movement of the adjacent blocks is restricted, thereby serving as a guide for aligning the blocks. In addition, convex part 2
The second and concave portions 23 may be curved surfaces so that they do not wear even when the angle between the adjacent blocks changes due to the bending of the belt.

By fitting the guide portion including the convex portion 22 and the concave portion 23 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 side pillars 7 and 8, 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, so that the guide portions are adjacent to each other. This is a place where the relative movement of the blocks is the least, and the abrasion of the protrusions and the recesses is less than when provided at other places, which is a more preferable form.

The lower half of the front side of the block 5 from the vicinity of the vertical center of the side pillars 7 and 8 is an inclined surface including the beam portion 6, and when the belt enters the pulley and is bent, the front and rear blocks are connected to each other. Does not contact the front and back.

Further, as shown in the cross section in FIG. 7, a projecting portion 9a is formed on the upper surface of the beam portion 6 in the fitting groove 9, and meshes with the groove portion 4b on the lower surface of the center belt 4. It has become. Further, the lock portions 11, 1, 1
2, a convex ridge 9b is formed on the lower surface, and the convex ridge 9b is fitted on the groove 4c provided on the upper surface of the center belt 4.
The lock portions 11 and 12 also play a role of power transmission.

If the reinforcing member 20 is also arranged on the side pillars 7, 8 and the lock portions 11, 12, at least the resin member 21 has at least the pulley contact surfaces 5a, 5b that contact the pulley.
The block 5 is formed by covering the entire surface of a metal reinforcing member 20 with a resin material 21 as shown in FIG. A material in which a portion corresponding to the pulley contact portion and a portion corresponding to the beam portion of the material 20 are covered with the resin material 21 can also be used.

[0030]

Next, a test was conducted to compare the time required for the belt of the present invention and the belt of the present invention to run after actually running.
Example 1 is a high-load transmission belt as shown in FIG. 1, and a center belt is a belt having upper and lower convex portions in which a core made of aramid fiber is spirally embedded in hydrogenated nitrile rubber, An aluminum alloy was used as the material for the reinforcing material of the block, and a phenol resin was used as the resin. Then, a support member is disposed between the two lock portions, so that the side pressure is supported by the support member.

As a comparative example, the same belt as in Example 1 was used except that no support member was provided between the two lock portions.

The running conditions of the two belts are as follows. The driving pulley has a pitch diameter of 65 mm and the rotation speed is 3200 rpm, the driven pulley has a pitch diameter of 130 mm and the rotation speed is 1600 r.
pm, the ambient temperature is 90 ° C., and the load torque is 0-9.
The belt was run while changing to kgfm. The slip ratio at each torque of each belt was measured. The result is shown in FIG.

As can be seen from FIG. 8, the slip ratio of the embodiment is lower in the particularly high torque region than that of the comparative example, and it can be understood that the transmission performance is improved by adopting the structure of the present invention.

[0034]

As described above, the high-load transmission belt according to the present invention comprises a center belt and a plurality of blocks fitted and arranged in the longitudinal direction of the center belt. It has a fitting groove surrounding three sides by two side pillars extending upward from both ends of the beam portion, and a lock portion for preventing the center belt from coming off in each of the two side pillars. A support member for preventing the block from bending inward due to the lateral pressure is interposed between them.

By adopting such a configuration, the block enters the pulley while the belt is running, and the block is bent by being supported by the support member even when receiving the tension of the center belt and the side pressure from the pulley. And a large pressure can be generated between the pulley and the block, the lock does not bite into the center belt, a large transmission force is selected, and block and center belt damage is prevented. A long life belt can be provided.

In the second aspect, the contact surface between the lock portion and the support member is formed by a curved surface having a convex portion on the lock portion side.
The lock portion is movable with respect to the support member in the belt traveling direction. By adopting such a configuration, even if the lock portion is twisted to move in the belt traveling direction,
The stress is not concentrated on the support member and its vicinity, and the breakage of the block can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a high-load transmission belt according to the present invention.

FIG. 3 is a perspective view of a support member.

FIG. 4 is a plan view showing how the block is twisted.

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

FIG. 6 is a longitudinal sectional view at a position of a guide convex portion.

FIG. 7 is a longitudinal sectional view of the high-load transmission belt at a fitting groove position.

FIG. 8 is a graph showing slip rates of the belts of the example and the comparative example with respect to each torque.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High load transmission belt 2 Elastomer 3 Core wire 4 Center belt 4a Upper surface 5 Block 5a Side surface 5b Side surface 6 Beam part 7 Side pillar 8 Side pillar 9 Fitting groove 10 Opening 11 Lock part 12 Lock part 13 Support member 14 Groove 15 Projection Part 16 convex curved surface 17 convex curved surface 18 concave curved surface 19 concave curved surface

Claims (2)

[Claims] 1. A fitting comprising a center belt and a plurality of blocks fitted and arranged in the longitudinal direction of the center belt, the block being surrounded on three sides by a beam portion and two side pillars extending upward from both ends of the beam portion. With a groove
Each of the two side pillars has a lock portion that prevents the center belt from coming off, and a support member that prevents the block from bending inward due to lateral pressure is interposed between the two lock portions. A high-load transmission belt characterized by being made. 2. The high load transmission belt according to claim 1, wherein a contact surface between the lock portion and the support member is formed by a convex curved surface on the lock portion side, and the lock portion is movable relative to the support member in the belt advancing direction. .