WO2013069244A1

WO2013069244A1 - Raw edge v belt for double-sided transmission

Info

Publication number: WO2013069244A1
Application number: PCT/JP2012/007056
Authority: WO
Inventors: 敬志藤原
Original assignee: バンドー化学株式会社
Priority date: 2011-11-07
Filing date: 2012-11-02
Publication date: 2013-05-16
Also published as: KR101992805B1; TWI558934B; JP2017125615A; CN103890449A; TW201341688A; KR20140088863A; JPWO2013069244A1; CN103890449B; JP6271791B2

Abstract

In this raw edge V belt for double-sided transmission, bottom cogs (3) are formed at a set pitch along the lengthwise direction on the inner peripheral side of a belt main body (2), the inner peripheral side of the belt main body (2) is covered by an inside reinforcing fabric (4), top cogs (5) are formed at a set pitch along the lengthwise direction of the outer peripheral side of the belt main body (2), the outer peripheral side of the belt main body (2) is covered by an outside reinforcing fabric (6), and an adhesive rubber layer (7) is disposed between the bottom cogs (3) and the top cogs (5). A core wire (8) is disposed along the lengthwise direction of the adhesive rubber layer (7), and seen from the lengthwise direction, the bottom cogs (3) are split into a V-shaped cross section and the top cogs (5) are spit into an inverted V-shaped cross section. The distance of the peaks of the bottom cogs (3) from the core wire (8) and the distance of the peaks of the top cogs (5) from the core wire (8) are caused to be approximately equivalent.

Description

Low-edge V-belt for double-sided transmission

The present invention relates to a low-edge V-belt for double-sided transmission having cogs on both sides.

Conventionally, in an endless low-edge V-belt in which a core wire is embedded, an elongated long rubber layer is formed on the upper portion thereof, and a compressed rubber layer is provided on the lower portion thereof, the belt is provided on both the stretched rubber layer and the compressed rubber layer for the purpose of enhancing bending resistance. It is known to provide a cog portion in the length direction.

For example, in Patent Document 1, a stretched rubber layer is stacked on the upper part of an adhesive rubber layer that is hung between pulleys having a V-shaped groove and has a core wire embedded in the longitudinal direction of the belt, and the pulley is in contact with the lower part. In a low-edge cog belt having a compression rubber layer having a surface, a cog portion on both the stretch rubber layer and the compression rubber layer, and an inclined surface that does not contact the pulley over the entire belt circumference on both sides of the stretch rubber layer It is known that the pitch line is provided above the boundary line between the inclined surface and the pulley contact surface.

Further, as in Patent Document 2, a lower cog is formed at a constant pitch along the length direction on the inner peripheral side of the belt main body, and the inner peripheral side of the belt main body is covered with an inner reinforcing cloth. There is known a V-belt in which upper cogs are formed at a constant pitch along the length direction on the outer peripheral side and the outer peripheral side of the belt body is covered with an outer reinforcing cloth.

JP 2001-263431 A JP 2009-216181 A

However, in the low edge V belt of Patent Document 1, the upper cog is not covered with the canvas, and inferior in durability in the case of transmission on the back surface, and cannot formally stably transmit power on the back surface.

Further, in the low edge V belt of Patent Document 2, the side surface of the upper cog has no inclined surface, cannot be transmitted as a V belt, and the thickness of the lower cog is different from that of the upper cog. There is a problem that different pulleys must be used for the upper cog and separate designs are required.

The present invention has been made in view of such a point, and an object of the present invention is to make the low-edge V-belt highly durable and capable of transmitting a low-edge V-belt on any surface.

In order to achieve the above object, in the present invention, the heights of the upper cog and the lower cog from the core wire are made substantially the same.

Specifically, in the first invention, a lower cog is formed at a constant pitch along the length direction on the inner peripheral side of the belt main body, and the inner peripheral side of the belt main body is covered with an inner reinforcing cloth.
An upper cog is formed at a constant pitch along the length direction on the outer peripheral side of the belt main body and the outer peripheral side of the belt main body is covered with an outer reinforcing cloth,
An adhesive rubber layer is disposed between the lower cog and the upper cog, and a core wire is disposed along the length direction of the adhesive rubber layer,
When viewed from the length direction, the lower cog is cut into a V-shaped cross section, the upper cog is cut into an inverted V-shaped cross section,
The distance of the apex of the lower cog from the core line is approximately equal to the distance of the apex of the upper cog from the core line.

According to the above configuration, in the low-edge V belt for double-sided transmission, high power transmission is possible on both the inner peripheral side and the outer peripheral side, and since the position of the core wire is stabilized, local wear is prevented and durability is improved. . Further, the minimum pulley diameter can be made the same on the upper side (reverse bending) and the lower side (forward bending). Moreover, it can be set as the reversible structure which can be reversed, and in that case, when one side is worn, it can be reversed and durability can be improved. Since the same slip and surface pressure can be designed on the upper side and the lower side, both sides can be designed with the same coefficient, so the design becomes easy. Note that “substantially equal” does not mean that the heights are exactly the same, but that a difference within ± 10% of the height is allowed. Moreover, the vertex here means the vertex when viewed from the width direction, and refers to a portion on the innermost side or the outermost side of the double edge transmission low edge V-belt.

In the second invention, in the first invention,
The pitch of the lower cog and the pitch of the upper cog are equal, and the apex of the lower cog and the apex of the upper cog are at the same position in the length direction when viewed from the width direction.

According to the above configuration, the difference in thickness between the place where the distance from the core wire is the largest and the place where the distance is the smallest is large, and the flexibility is excellent as a whole.

In the third invention, in the first invention,
The pitch of the lower cog is equal to the pitch of the upper cog, and the apex of the lower cog and the apex of the upper cog are at a position shifted by a half pitch in the length direction when viewed from the width direction.

According to the above configuration, since there are cogs on both sides, the flexibility is good, and the position of the valley bottom differs depending on the top and bottom, so that the thickness variation is small and the mechanical strength is high.

In the fourth invention, in the third invention,
The auxiliary pulley that rotates in the reverse direction to the rotation direction of the drive pulley is driven.

According to the above configuration, the driving force driven by the drive pulley on the lower cog side can be transmitted to the auxiliary pulley on the upper cog side with high transmission capability.

As described above, according to the present invention, the lower cog is cut into a V-shaped cross section when viewed from the length direction, and the upper cog is cut into an inverted V-shaped cross section when viewed from the length direction. By making the distance from the center line of the apex approximately equal to the distance from the center line of the top cog, the low edge V-belt can be made highly durable with high transmission capability capable of transmitting on any surface. .

It is a perspective view which fractures | ruptures and shows the low edge V belt for double-sided transmission of this embodiment. FIG. 4 is a sectional view taken along line II-II in FIG. 3. It is a side view which shows a low edge V belt. It is a flowchart which shows simply the manufacturing process of a low edge V belt. FIG. 9 is a view corresponding to FIG. 1 and showing a modification of the embodiment. FIG. 4 is a diagram corresponding to FIG. 3 of a modified example. It is the schematic which shows the usage example of a low edge V belt. It is a perspective view which fractures | ruptures and shows the double-sided V belt of a comparative example. It is the schematic which shows the testing apparatus of an evaluation test. It is a graph which shows the test result of an evaluation test.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 show a double-sided transmission low-edge V-belt 1 according to an embodiment of the present invention, and the double-sided transmission low-edge V-belt 1 is widely used in textile machines and agricultural machines having a multi-axis structure. In the double edge transmission low edge V-belt 1, lower cogs 3 are formed at a constant pitch P along the length direction on the inner peripheral side of the belt body 2. The pitch P is, for example, 9.52 mm. The inner peripheral side of the belt body 2 is covered with an inner reinforcing cloth 4.

Further, the upper cogs 5 are formed on the outer peripheral side of the belt body 2 at the same constant pitch P as the lower cogs 3 along the length direction. Further, the outer peripheral side of the belt body 2 is covered with an outer reinforcing cloth 6. For example, the inner reinforcing cloth 4 and the outer reinforcing cloth 6 are made of woolly nylon glued with chloroprene rubber, and the lower cogs 3 and the upper cogs 5 are made of chloroprene rubber. For example, the chloroprene rubber preferably has a rubber hardness of 80 to 95 ° in JIS-A and 60 to 80 ° in JIS-C. This chloroprene rubber may contain reinforcing fibers. In that case, aramid short fibers, nylon short fibers, polyester short fibers, or mixed short fibers thereof may be kneaded. For example, the height b from the apex of the lower cog 3 and the upper cog 5 to the valley bottom when viewed from the width direction is 4.5 mm, and the round radius R1 of the apex of the lower cog 3 and the upper cog 5 is 1.1 mm. The radius R2 of the valley is 1.3 mm. The pitch P of the lower cog 3 and the pitch P of the upper cog 5 are equal, and the apex of the lower cog 3 and the apex of the upper cog 5 are at the same position in the length direction when viewed from the width direction.

The adhesive rubber layer 7 is disposed between the lower cog 3 and the upper cog 5. The adhesive rubber layer 7 is made of chloroprene rubber and has a thickness t of t = 1.4 mm, for example. A plurality of core wires 8 are arranged along the length direction of the adhesive rubber layer 7 at intervals in the width direction. The core 8 is made of, for example, a bundle of 1670 dtex (decitex) aramid fibers, the lower twist is 2 S twists of 24/10 cm, and the upper twist is 11 twists / 10 cmZ of 5 twists, a total of 16700 dtex twist cord And

The lower cog 3 is cut into a V-shaped cross section when viewed from the length direction of the low-edge V-belt 1 for both-side transmission. Similarly, the upper cog 5 is cut into an inverted V-shaped cross section when viewed from the length direction. For example, the cut angle θ is 38 °, the maximum width W1 of the double edge transmission low edge V-belt 1 is 14.4 mm, and the minimum width W2 is 10.3 mm.

The distance H2 from the core line 8 of the apex of the lower cog 3 is approximately equal to the distance H1 from the core line 8 of the apex of the upper cog 5. Here, “substantially equal” does not mean that the heights are exactly the same, but means that a difference within ± 10% of the height is allowed. For example, H1 = H2 = H / 2 = 6. When 7 mm, a difference of ± 0.67 mm is an error range. If it is out of the range, a problem occurs in meshing with a toothed pulley (not shown).

With such a configuration, the double-sided transmission low-edge V-belt 1 is substantially symmetrical up and down around the core wire 8, and in some cases, can be configured to be reversible. In that case, when one side is worn, it can be turned over to improve durability.

Also, in the low-edge V-belt 1 for double-sided transmission, high transmission is possible on both the inner and outer peripheral sides, and the position of the core 8 is stabilized, so that local wear is prevented and durability is improved. Further, the minimum pulley diameter can be made the same on the upper side (reverse bending) and the lower side (forward bending), and the same slip and surface pressure can be designed on the upper side and the lower side. For this reason, the design can be made with the same coefficient on both the upper and lower surfaces, and the design becomes extremely easy.

Also, the difference in thickness between the place where the distance from the core wire 8 is the largest and the place where the distance is the smallest is large, and the overall flexibility is excellent.

Therefore, according to the double edge transmission low edge V-belt 1 according to the present embodiment, the lower cog 3 is cut into a V-shaped cross section, and the upper cog 5 is cut into an inverted V-shaped cross section when viewed from the length direction. Since the distance from the center line 8 of the top 3 of the top 3 is approximately equal to the distance from the center line 8 of the top cog 5, the low edge V-belt 1 can be transmitted on any surface with high transmission capability and high durability. Can be.

-Production method-
Next, a method for manufacturing the double edge transmission low edge V-belt 1 according to the present embodiment will be briefly described with reference to FIG.

First, the lower cog 3 is molded in the first molding process of step S01. The inner reinforcing cloth 4 is pressed against a cylindrical mold in which a concave portion having the shape of the lower cog 3 is formed, and a layer of a bottom rubber such as chloroprene rubber is stacked thereon.

Next, in the first shaping process of step S02, the inner reinforcing cloth 4 and the bottom rubber are shaped into the shape of the lower cog 3 by applying pressure while heating the first molded product of the first molding process. At this time, the position of the core wire 8 is secured by adjusting the thickness.

Next, in the second molding step of Step S03, the adhesive rubber layer 7, the core wire 8, the adhesive rubber layer 7, the bottom rubber on the upper cog 5 side, and the outer reinforcing cloth 6 are wound around the molded product after thickness adjustment. The core 8 is manufactured by treating with an isocyanate-based adhesive and immersing it in RFL (resorcin / formalin / latex), followed by stretching heat treatment.

Next, in the second shaping step of step S04, the rubber sleeve is installed in the vulcanizer, and a rubber sleeve having a concave portion of the upper cog 5 is inserted from the outside and vulcanized.

Next, the vulcanized product is cut into a predetermined width in the ring cutting process of step S05.

Finally, in the double-sided V-cut process in step S06, the side surfaces of the lower cog 3 and the upper cog 5 are cut.

Thus, by stabilizing the position of the core 8, the life of the double edge transmission low edge V-belt 1 is extended, and stable high power transmission is possible on both sides.

-Modification of the embodiment-
5 and 6 show an embodiment of the present invention, which differs from the above embodiment in that the positional relationship between the lower cog 3 and the upper cog 5 is different. In this modification, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

That is, in the low-side transmission V-edge 101 of this modification, the pitch P of the lower cog 3 is equal to the pitch P of the upper cog 5 as in the above embodiment, and the position of the apex of the lower cog 3 is the upper cog 5 It is at a position shifted by a half pitch (1 / 2P) when viewed from the width direction with respect to the position of the vertex. So-called staggered arrangement.

According to this configuration, since there are the lower cog 3 and the upper cog 5 on both sides as in the above embodiment, the flexibility is good, and the position of the valley does not match as compared with the above embodiment, so the variation in thickness is reduced, High mechanical strength such as tensile strength.

Regarding the manufacturing method, the rubber sleeve may be adjusted in step S04 of the above embodiment so that the positions of the lower cog 3 and the upper cog 5 are shifted by a half pitch, and the other processes are the same as those of the above embodiment.

Also, the operational effects are the same as in the above embodiment, and the low edge V-belt 101 can be made highly durable with high transmission capability capable of transmitting on any surface.

-Example of use-
As shown in FIG. 7, for example, the low-edge V-

belt

1, 101 of the present embodiment of 90 inches is used, and the lower pulley 3 side of the low-edge V-

belt

1, 101 is connected to the drive pulley 10, the first driven pulley 11, and the first pulley. 3 While hanging on the driven pulley 13, the upper cog 5 side is hooked on the second driven pulley 12. Further, the tension pulley 14 is brought into contact with the upper cog 5 side to adjust the tension.

Thereby, the first driven pulley 11 and the third driven pulley 13 can be driven with a high driving force on the lower cog 3 side. Moreover, if the second driven pulley 12 is an auxiliary pulley for an agricultural machine (not shown), for example, the auxiliary device can be driven with a high driving force.

-Evaluation test-
The low-edge V-belt 1 of the present embodiment was used as an example, and a double-sided V-belt 201 (manufactured by Bando Chemical Co., Ltd.) in which the entire belt side surface shown in FIG.

The driving pulley 210 shown in FIG. 9 has a pulley outer diameter of 111 mm and a rotation speed of 1800 rpm, and the driven pulley 211 has a pulley outer diameter of 111 mm.

The shaft load DW (dead weight) was gradually increased until the slip ratio exceeded 4%, and multiplied until the power transmission reached a maximum. The ST coefficient (N / m) indicating the effective tension of the belt per unit winding length at this time was calculated by the following formula (1) (for the ST coefficient, refer to Japanese Patent Laid-Open No. 2001-59548). .

Here, P is a load (kW), D is an outer diameter of the pulley (mm), n is a rotation speed (rpm) of the driven pulley 211, θ is a contact angle of 180 °, and 2k is a coefficient. In this case, 6.0 It was.

FIG. 10 shows the result of comparison between the example and the comparative example. As can be seen from FIG. 10, it was found that the example exhibited almost three times the transmission capability with respect to the comparative example having the same slip ratio. As described above, it was confirmed that the low edge V-belt 1 of the example can transmit a higher load than the comparative example.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

That is, in the above-described embodiment, for example, one material example and dimension example of the low-side transmission V-belt 1,101 for double-sided transmission are shown, but the present invention is not limited thereto, and other materials and dimensions may be used. For example, the material of the core 8 may be a polyester material such as polyethylene terephthalate (PET), and the rubber material may be ethylene-propylene-diene rubber (EPDM), hydrogenated nitrile rubber (H-NBR), natural rubber, or the like. Good. The inner reinforcing cloth 4 and the outer reinforcing cloth 6 may be plain woven cotton canvas, synthetic fiber mixed canvas, or the like.

In addition, the above embodiment is an essentially preferable example, and is not intended to limit the scope of the present invention, its application, and use.

As described above, the present invention is useful for the double-sided transmission low edge V belt having cogs on both sides.

1,101 Double edge transmission low edge V belt 2 Belt body 3 Lower cog 4 Inner reinforcing cloth 5 Upper cog 6 Outer reinforcing cloth 7 Adhesive rubber layer 8 Core wire 10 Drive pulley 12 Second driven pulley (auxiliary pulley)

Claims

A lower cog is formed at a constant pitch along the length direction on the inner peripheral side of the belt main body and the inner peripheral side of the belt main body is covered with an inner reinforcing cloth,
An upper cog is formed at a constant pitch along the length direction on the outer peripheral side of the belt main body and the outer peripheral side of the belt main body is covered with an outer reinforcing cloth,
An adhesive rubber layer is disposed between the lower cog and the upper cog, and a core wire is disposed along the length direction of the adhesive rubber layer,
When viewed from the length direction, the lower cog is cut into a V-shaped cross section, the upper cog is cut into an inverted V-shaped cross section,
The double edge transmission low-edge V-belt characterized in that the distance of the lower cog apex from the core is substantially equal to the distance of the upper cog apex from the core.
In the low edge V belt for double-sided transmission according to claim 1,
The lower edge for double-sided transmission, wherein the pitch of the lower cog is equal to the pitch of the upper cog, and the apex of the lower cog and the apex of the upper cog are at the same position in the length direction when viewed from the width direction V belt.
In the low edge V belt for double-sided transmission according to claim 1,
The double-sided characterized in that the pitch of the lower cog is equal to the pitch of the upper cog, and the apex of the lower cog and the apex of the upper cog are at a position shifted by a half pitch in the length direction when viewed from the width direction. Low edge V belt for transmission.
In the low-edge V belt for double-sided transmission according to any one of claims 1 to 3,
A double-sided transmission low-edge V-belt for driving an auxiliary pulley that rotates in the reverse direction to the rotation direction of the drive pulley.