JP6807163B2 - Belt and its manufacturing method - Google Patents

Description

The present invention relates to a belt that is a toothed belt or a flat belt and a method for manufacturing the same.

For example, in belts used for power transmission and article transportation such as toothed belts and flat belts, the belt width tends to be reduced because the installation space of the belt is limited due to the miniaturization of the device in which the belt is used. It is in. On the other hand, there are cases where power transmission is performed with a high load and cases where the weight of the transported article is large, so it is necessary to secure the belt strength.

When the belt width is reduced and the number of core lines in the cross section orthogonal to the belt longitudinal direction is reduced, the belt strength can be reduced. Therefore, in order to secure the belt strength, a method of increasing the diameter of the core wire, a method of arranging the core wires densely in the belt width direction, etc. can be considered, but these methods improve the belt strength per unit width. Has its limits.

As a method for improving the belt strength per unit width, in addition to the above method, a method of arranging a plurality of core wires in the belt thickness direction as shown in Patent Documents 1 and 2 can be considered. Patent Documents 1 and 2 have a structure in which a plurality of core wires arranged in the belt thickness direction are wound around each other (see claim 6 of patent document 1 and claim 1 of patent document 2).

JP-A-2014-142046 Jitsukosho 61-32184

The belts of Patent Documents 1 and 2 have a structure in which a plurality of core wires arranged in the belt thickness direction are wound around each other, and the plurality of core wires are in contact with each other and the positions of the plurality of core wires are not fixed. Therefore, the core wires are in sliding contact with each other, and the wear of the core wires can be promoted. In addition, if the core wires are densely arranged in order to stabilize the position of the core wires in order to suppress the problem, it becomes difficult to fill the main body made of rubber or the like between the core wires, resulting in poor belt shape, poor adhesion, etc. Another problem can arise.

An object of the present invention is a toothed belt or a flat belt capable of efficiently improving the belt strength per unit width while suppressing problems such as wear of core wires, poor shape of the belt, and poor adhesion. It is to provide a belt and a method for manufacturing the belt.

According to the first aspect of the present invention, in a belt having a toothed belt or a flat belt having a first layer and a second layer laminated in the belt thickness direction, the first layer and the second layer are thermoplastic. It has a main body made of an elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt, and the main bodies are joined to each other by heat welding and are included in the first layer. The core wire and the core wire included in the second layer are separated from each other via the main body, and the core wire included in the first layer and the core wire included in the second layer are included. The distance D2 from the core wire in the belt thickness direction is a value obtained by subtracting the thickness of the tooth portion from the thickness of the entire belt when the belt is a toothed belt, or the entire belt when the belt is a flat belt. Provided is a belt characterized in that the thickness is in the range of D1 × 6 to 33%, where D1 is taken.

According to the second aspect of the present invention, in the method for manufacturing a belt having a toothed belt or a flat belt, a main body made of a thermoplastic elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt are formed. The first layer forming step of forming the first layer having the belt, and the second layer having a main body made of a thermoplastic elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt are formed. The joining step includes a second layer forming step and a joining step in which the second layer is laminated on one surface of the first layer in the belt thickness direction and the main bodies are joined to each other by heat welding. The core wire contained in the first layer and the core wire contained in the second layer are separated from each other via the main body, and the core wire contained in the first layer and the second core wire are separated from each other . The distance D2 between the core wire included in the layer and the core wire in the belt thickness direction is the value obtained by subtracting the thickness of the tooth portion from the thickness of the entire belt when the belt is a toothed belt, or the belt is a flat belt. Provided is a method for manufacturing a belt, which comprises a range of D1 × 6 to 33%, where D1 is the thickness of the entire belt in the case .

According to the first and second viewpoints, since the core wire contained in the first layer and the core wire contained in the second layer are separated from each other via the main body, it is possible to suppress the wear of the core wire. it can. Further, since it is not necessary to arrange the core wires densely in order to suppress the wear of the core wires, problems such as poor shape of the belt and poor adhesion can be suppressed. Therefore, according to the present invention, the belt strength per unit width is made efficient by arranging a plurality of core wires in the belt thickness direction while suppressing problems such as wear of the core wires, poor shape of the belt, and poor adhesion. Can be improved well.

Further, according to the first and second viewpoints, the distance D2 between the core wire included in the first layer and the core wire included in the second layer in the belt thickness direction is set by the belt. When the thickness of the entire belt in the case of a toothed belt is subtracted from the thickness of the tooth portion, or when the thickness of the entire belt in the case of the flat belt is D1, the range is D1 × 6 to 33%. Tooth .

According to the above configuration, when the interval D2 is too small, there are problems such as poor shape and adhesion of the belt due to the small number of main bodies filled between the core wires, and when the interval D2 is too large, the back surface of the belt The problem of deterioration in followability to the pulley shape (see Examples described later) can be suppressed together.

The thermoplastic elastomer constituting the main body is composed of a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, and a vinyl chloride-based thermoplastic elastomer. It may be at least one selected from the group.

The thermoplastic elastomer constituting the main body may be a polyurethane-based thermoplastic elastomer.

According to the above configuration, a belt having excellent mechanical properties and durability can be obtained. Further, since the polyurethane-based thermoplastic elastomer is widely used for transmission belts and conveyor belts, it is easy to manufacture belts.

The core wire may consist of a steel cord or a cord obtained by twisting at least one of aramid fibers and carbon fibers.

According to the above configuration, it is possible to more reliably improve the belt strength per unit width.

The diameter of the core wire contained in the first layer and the diameter of the core wire contained in the second layer may be different from each other.

According to the above configuration, it is possible to obtain appropriate rigidity and flexibility according to the application.

The first layer arranged on the outer surface side of the belt has a flat surface on the outer surface side of the belt and the inner surface side of the belt, and the second layer arranged on the inner surface side of the belt has a flat surface on the outer surface side of the belt. The tooth portion may be provided on the inner surface side of the belt.

According to the above configuration, the present invention can be applied to a toothed belt.

In the first layer arranged on the outer surface side of the belt and the second layer arranged on the inner surface side of the belt, both the outer surface side surface of the belt and the inner surface side surface of the belt may be flat.

According to the above configuration, the present invention can be applied to a flat belt.

In the manufacturing method according to the second aspect, the second layer forming step and the joining step may be performed at the same time.

According to the above configuration, the manufacturing process is simplified.

According to the present invention, the belt strength per unit width is efficiently improved by arranging a plurality of core wires in the belt thickness direction while suppressing problems such as wear of the core wires, poor shape of the belt, and poor adhesion. Can be made to.

(A) is a cross-sectional view (along the IA-IA line of FIG. 1B) in a direction orthogonal to the longitudinal direction of the belt, showing the belt according to the first embodiment of the present invention. FIG. 1B is a cross-sectional view taken along the line IB-IB of FIG. 1A showing the belt according to the first embodiment of the present invention. (A) is a cross-sectional view (along the line IIA-IIA of FIG. 2B) in a direction orthogonal to the longitudinal direction of the belt, showing the belt according to the second embodiment of the present invention. (B) is a cross-sectional view taken along the line IIB-IIB of FIG. 2A showing the belt according to the second embodiment of the present invention. It is sectional drawing in the direction orthogonal to the belt longitudinal direction which shows the belt which concerns on 3rd Embodiment of this invention. It is the schematic for demonstrating the manufacturing method of the belt which concerns on 1st Embodiment of this invention. It is the schematic for demonstrating the application example of the belt which concerns on 1st to 3rd Embodiment of this invention.

First, the belt 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

The belt 1 is a toothed belt. The belt 1 has a first layer 10 and a second layer 20 laminated in the belt thickness direction. In the first layer 10 arranged on the belt outer surface (back surface) side 1x, both the belt outer surface side 1x surface and the belt inner surface side 1y surface are flat. The second layer 20 arranged on the inner surface side 1y of the belt has a flat surface on the outer surface side 1x of the belt and has a plurality of tooth portions 23 on the surface 1y on the inner surface side of the belt. The plurality of tooth portions 23 extend in the belt width direction and are arranged apart from each other at predetermined intervals in the belt longitudinal direction.

The first layer 10 has a main body 11 made of a thermoplastic elastomer and a core wire 12 embedded in the main body 11 and extending in the longitudinal direction of the belt. The second layer 20 has a main body 21 made of a thermoplastic elastomer and a core wire 22 embedded in the main body 21 and extending in the longitudinal direction of the belt. In the first layer 10 and the second layer 20, the main bodies 11 and 21 are joined to each other by heat welding.

The core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 are separated from each other via the main bodies 11 and 21. The distance D2 between the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 in the belt thickness direction is the total thickness T of the belt 1 (= thickness T1 of the first layer 10 + second layer). When the value obtained by subtracting the thickness H of the tooth portion 23 from the thickness T2) of 20 is taken as D1, it is in the range of D1 × 6 to 33%.

Next, the belt 201 according to the second embodiment of the present invention will be described with reference to FIGS. 2 (a) and 2 (b).

The belt 201 is a flat belt. Similar to the first embodiment, the belt 201 has a first layer 10 and a second layer 20 laminated in the belt thickness direction. However, in the present embodiment, the first layer 10 arranged on the belt outer surface side 1x and the second layer 20 arranged on the belt inner surface side 1y have a surface of the belt outer surface side 1x and a surface of the belt inner surface side 1y. Both are flat. The configuration of the first layer 10 and the second layer 20 in the belt 201 is the same as that of the first embodiment except that the second layer 20 does not have the tooth portion 23. That is, the first layer 10 and the second layer 20 of the belt 201 are the main bodies 11 and 21 made of thermoplastic elastomer and the core wires 12 embedded in the main bodies 11 and 21 and extending in the longitudinal direction of the belt, respectively. It has 22 and.

Also in the present embodiment, as in the first embodiment, the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 are separated from each other via the main bodies 11 and 21. The distance D2 between the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 in the belt thickness direction is the total thickness T of the belt 201 (= thickness T1 of the first layer 10 + second layer). When the thickness T2) of 20 is D1, it is in the range of D1 × 6 to 33%.

Next, the belt 301 according to the third embodiment of the present invention will be described with reference to FIG.

The belt 301 is a flat belt. Similar to the first embodiment, the belt 301 has a first layer 10 and a second layer 20 laminated in the belt thickness direction. However, in the present embodiment, as in the second embodiment, the first layer 10 arranged on the belt outer surface side 1x and the second layer 20 arranged on the belt inner surface side 1y are the surface of the belt outer surface side 1x and the surface of the belt outer surface side 1x. Both surfaces 1y on the inner surface side of the belt are flat. The configuration of the first layer 10 and the second layer 20 is that the second layer 20 does not have the tooth portion 23, the diameter of the core wire 12 included in the first layer 10 and the core included in the second layer 20. It is the same as the first embodiment except that the diameter of the wire 22 is different from each other (the diameter of the core wire 12 is larger than the diameter of the core wire 22). That is, the first layer 10 and the second layer 20 of the belt 301 are the main bodies 11 and 21 made of a thermoplastic elastomer and the core wires 12 embedded in the main bodies 11 and 21 and extending in the longitudinal direction of the belt, respectively. It has 22 and.

Also in the present embodiment, as in the first embodiment, the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 are separated from each other via the main bodies 11 and 21. The distance D2 between the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 in the belt thickness direction is the total thickness T (= first layer) of the belt 301 as in the second embodiment. When the thickness T1 of 10 + the thickness T2) of the second layer 20 is D1, it is in the range of D1 × 6 to 33%.

In the belts 1; 201; 301 according to the first to third embodiments, the rigidity of the belt 1 can be increased and the D2 can be decreased by increasing the D2 within the range of D2 = D1 × 6 to 33%. By doing so, the flexibility of the belt 1 can be increased.

The belts 1; 201; 301 according to the first to third embodiments both have a width W of 10 to 100 mm and a diameter of the core wires 12 and 22 of 0.3 to 2.0 mm. In the belts 1; 201 according to the first and second embodiments, the pitch P of the core wires 12 and 22 in the belt width direction is 0.3 to 4.0 mm, and in the belt 301 according to the third embodiment, the pitch P is 0.3 to 4.0 mm. The pitch P1 in the belt width direction of the core wire 12 and the pitch P1 in the belt width direction of the core wire 22 are different from each other.

Next, a method for manufacturing the belt 1 according to the first embodiment will be described.

In the production of the belt 1, first, the first layer 10 is formed (first layer forming step). When the first layer 10 is formed, the thermoplastic elastomer that becomes the main body 11 (in this embodiment, a polyurethane-based thermoplastic elastomer, for example, a polyether-based, polyester-based, or polycarbonate-based one. Hardness = 80 to 95 ° (Compliant with JIS K6253, measured with an A-type hardness tester), the steel cord (cord made by twisting steel strands) to be the core wire 12 is buried. Further, when forming the first layer 10, a known method (see, for example, Japanese Patent Application Laid-Open No. 2000-104792) may be used.

After the first layer forming step, the second layer 20 is formed using the manufacturing apparatus shown in FIG. 4 (second layer forming step), and the second layer 20 is joined to the first layer 10 by heat welding (the second layer forming step). Joining process).

The manufacturing apparatus shown in FIG. 4 has a mold (molding drum) 50, three pulleys 51 to 53, and a pressing band 55. Grooves (tooth cutting portions) (not shown) for forming the tooth portions 23 are formed on the outer peripheral surface of the mold 50 at predetermined intervals in the circumferential direction. The pressing band 55 is an endless metal band, which is wound around three pulleys 51 to 53 and is arranged so as to be wound around the outer peripheral surface of the mold 50 by about half a circumference, from the pulley 53. By applying tension, it is pressed against the outer peripheral surface of the mold 50.

In this state, the first layer 10 is arranged on the pressing band 55 so that the tip portion of the first layer 10 in the longitudinal direction wraps around the pulley 51. Then, while rotating the mold 50 in the direction of the arrow in FIG. 4, a steel cord having a predetermined number of core wires 22 aligned in parallel is supplied to the portion between the pulley 51 and the mold 50. Further, when the first layer 10 and the steel cord serving as the core wire 22 are caught between the pulley 51 and the mold 50, the thermoplastic elastomer that becomes the main body 21 from the extrusion head 61 (in the present embodiment, the main body). A polyurethane-based thermoplastic elastomer similar to the thermoplastic elastomer of No. 11. For example, a polyether-based, polyester-based, or polycarbonate-based one. Hardness = 80 to 95 ° (compliant with JIS K6253, measured with an A-type hardness tester). Within the range) is supplied to the portion between the pulley 51 and the mold 50 in a state of being melted by heating.

As the mold 50 rotates, the first layer 10, the steel cord serving as the core wire 22, and the thermoplastic elastomer serving as the main body 21 are caught between the mold 50 and the pressing band 55. At this time, by pressing with the pressing band 55, the thermoplastic elastomer serving as the main body 21 is filled in the groove (not shown) formed on the outer peripheral surface of the mold 50, and the tooth portion 23 of the second layer 20 is formed. .. Further, at this time, a portion (a portion in which the core wire 22 is embedded) other than the tooth portion 23 in the second layer 20 is formed between the first layer 10 and the outer peripheral surface of the mold 50. That is, at this time, the second layer 20 is formed, and the second layer 20 is laminated on one surface of the first layer 10 in the belt thickness direction, and the main bodies 11, 21 are joined to each other by heat welding. That is, in the present embodiment, the second layer forming step and the joining step are performed at the same time. In the joining step, the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 are separated from each other via the main bodies 11 and 21.

The thermoplastic elastomers used as the main bodies 11 and 21 include polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, and vinyl chloride-based heat. It may be at least one selected from the group consisting of thermoplastic elastomers (that is, any one of the above may be used, or two or more of the above may be used in combination).

The core wires 12 and 22 include a steel cord, a cord obtained by twisting at least one of aramid fiber and carbon fiber (that is, a cord obtained by twisting aramid fiber, a cord obtained by twisting carbon fiber, or an aramid fiber. And a cord made by twisting carbon fibers) may be used.

The manufacturing conditions are, for example, that the melting temperature of the thermoplastic elastomer that becomes the main body 21 is 200 to 230 ° C, the temperature of the mold 50 is room temperature to 120 ° C, and the feed rate of the first layer 10 and the core wire 22 is 0.1 to 1. It is 0.0 m / min.

The manufacturing method of the belt 201; 301 according to the second and third embodiments is the same as the manufacturing method of the belt 1 according to the first embodiment, except that the mold 50 having no groove on the outer peripheral surface is used.

Next, an example of using the belt 1; 201; 301 according to the first to third embodiments will be described.

Belts 1; 201; 301 according to the first to third embodiments are both open-ended belts. While the endless belt is formed in an annular shape on a cylindrical mold, the open end belt with both ends can be continuously formed by extrusion molding, etc., so there is an advantage that the length of the belt can be freely selected. is there.

As an example of the use of the open-end belt, there is one in which both ends of the belt are fixed and reciprocated within a certain range (for example, an elevating and transporting device as shown in FIG. 5). In such an elevating and lowering transport device, an open-ended type flat belt (belt 201; 301 according to the second or third embodiment) suspended from a flat pulley arranged above and a toothed pulley arranged below. In some cases, a belt mechanism combined with an open-ended type toothed belt (belt 1 according to the first embodiment) that meshes with the teeth of the above is used side by side. In each belt mechanism, joints are fixed to both ends of the flat belt and the toothed belt, and the flat belt and the toothed belt are connected via the joint to form an annular belt as a whole. In the belt mechanism arranged side by side, when the loading platform is fixed to two adjacent joints and the conveyed object is placed on the loading platform, one of the toothed pulleys, which is the drive pulley, is rotated in the forward direction or the reverse direction. The belt mechanism is driven and the transported object moves up and down.

In such an elevating and lowering transport device, the belt installation space is limited and the belt width tends to be reduced as the device is miniaturized. On the other hand, the weight of the transported object may be large, and it is necessary to secure the belt strength.

As described above, according to the first to third embodiments, the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 are connected to each other via the main bodies 11 and 21. It is separated. Therefore, the wear of the core wires 12 and 22 can be suppressed. Further, since it is not necessary to arrange the core wires 12 and 22 densely in order to suppress the wear of the core wires 12 and 22, problems such as poor shape of the belt and poor adhesion can be suppressed. Therefore, according to the first to third embodiments, a plurality of core wires 12 and 22 are arranged in the belt thickness direction while suppressing problems such as wear of the core wires 12 and 22, poor shape of the belt, and poor adhesion. As a result, the belt strength per unit width can be efficiently improved.
Further, according to the first to third embodiments, the main bodies 11 and 21 can be easily joined to each other by heat welding. Moreover, since the positions of the core wires 12 and 22 are fixed in the main bodies 11 and 21, respectively, the positions (arrangement) of the core wires 12 and 22 are stabilized.

The distance D2 between the core wire 12 included in the first layer 10 and the core wire 22 included in the second layer 20 in the belt thickness direction is the thickness H of the tooth portion 23 from the total thickness T of the belt 1 in the belt 1. The subtracted value, in the case of the belt 201; 301, is in the range of D1 × 6 to 33% when the thickness T of the entire belt 201; 301 is D1. According to this configuration, when the interval D2 is too small, there are problems such as poor shape of the belt and poor adhesion due to the small number of main bodies 11 and 21 filled between the core wires 12 and 22, and the interval D2 is too large. In this case, the problem of deterioration in followability to the shape of the pulley on the back surface of the belt can be suppressed together.

The thermoplastic elastomers constituting the main bodies 11 and 21 are polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polyamide-based thermoplastic elastomers, and vinyl chloride-based thermoplastic elastomers. At least one selected from the group consisting of. In particular, in the first to third embodiments, the thermoplastic elastomers constituting the main bodies 11 and 21 are polyurethane-based thermoplastic elastomers. According to this configuration, a belt having excellent mechanical properties and durability can be obtained. Further, since the polyurethane-based thermoplastic elastomer is widely used for transmission belts and conveyor belts, it is easy to manufacture belts.

The core wires 12 and 22 consist of a steel cord or a cord obtained by twisting at least one of aramid fibers and carbon fibers. According to this configuration, it is possible to more reliably improve the belt strength per unit width.

In the third embodiment, the diameter of the core wire 12 included in the first layer 10 and the diameter of the core wire 22 included in the second layer 20 are different from each other. According to this configuration, it is possible to obtain appropriate rigidity and flexibility according to the application.

In the belt manufacturing method according to the first to third embodiments, the second layer forming step and the joining step are performed at the same time. According to this configuration, the manufacturing process is simplified.

The present inventor measured the core line spacing D2, the belt strength, etc. of the flat belt and the toothed belt using Examples and Comparative Examples. Examples of flat belts correspond to flat belts according to a third embodiment manufactured by the above-mentioned manufacturing method (see Table 1 for a specific configuration). Comparative Examples of the flat belt, of the flat belt according to a third exemplary form status is obtained using only the second layer 20 (detailed structure, see Table 2). In the example of the toothed belt, a tooth portion is added to the flat belt according to the third embodiment (see Table 3 for a specific configuration). In the comparative example of the toothed belt, the tooth portion is added to the second layer 20 of the flat belt according to the third embodiment (see Table 4 for the specific configuration).

Regarding the core line spacing D2 (Table 5), the belt according to the embodiment is cut in a direction orthogonal to the longitudinal direction of the belt, and in the cross section thereof (see FIG. 3), the surface 1y on the inner surface side of the belt is used as the reference surface as the reference surface. The distance x1 from the reference plane to the portion closest to the reference plane (bottom of FIG. 3) on the core line 12 and the distance x2 from the reference plane to the portion farthest from the reference plane (top of FIG. 3) on the core line 22. And the difference between x1 and x2 (x1-x2) was defined as the distance D2 between the core lines 12 and 22. The distances x1 and x2 were measured at 15 points of the core wires 12 and 22 appearing in the cross section, and the interval D2 was derived using the average value of the distances x1 and x2 obtained by the measurement.

Further, in the cross section of the belt according to the embodiment, the distance y1 from the reference plane to the center of the core wire 12 of the first layer 10 and the distance y2 from the reference plane to the center of the core wire 22 of the second layer 20 were measured. .. Similar to the measurement of the distances x1 and x2, the distances y1 and y2 were also measured at 15 points of the core wires 12 and 22 appearing in the above cross section, and the average value of each distance y1 and y2 obtained by the measurement was used as the measured value. ..

Further, the belt according to the comparative example is cut in a direction orthogonal to the longitudinal direction of the belt, and the distance from the reference plane to the center of the core line is determined by using one of the inner surface side and the outer surface side of the belt as a reference surface in the cross section. It was measured. Similar to the measurement of the distances x1 and x2, the distance was also measured at 15 points of the core wires appearing in the above cross section, and the average value of the distances obtained by the measurement was used as the measured value.

Regarding the belt strength (Table 5), test pieces having predetermined dimensions (length 300 mm, width 20 mm) were taken from the belts according to Examples and Comparative Examples, and each test piece was subjected to a tensile test (tensile test) with a tensile tester. The speed was 50 mm / min), and the strength until the test piece broke was measured.

Regarding the ease of winding around the pulley (Table 5), observe the ease of winding and the state of the belt when the belts according to the examples and comparative examples are wound around the pulley having a diameter of 270 mm and the pulley having a diameter of 400 mm, respectively. , It was evaluated in the following three stages.
◯: Easy to wrap around the pulley and no deformation of the belt Δ: Easy to wrap around the pulley but deform the belt ×: Not easy to wrap around the pulley and the belt Deformation also occurs

The formability (Table 5) was evaluated in the following three stages by observing the appearance properties of the belts according to Examples and Comparative Examples after molding.
◯: No defect in appearance quality △: Slight defect in appearance quality (exposure of core wire from the back of the belt, etc.)
×: There is a problem with the appearance (exposed core wire, crimping of core wire of each layer, etc.)

As shown in Table 5, the belt strength of both the flat belt and the toothed belt was significantly improved in the examples as compared with the comparative examples.

As shown in Table 5, in both the flat belt and the toothed belt, in the examples, the core line spacing D2 and the distances y1 and y2 could be made substantially the same as the target values (design values), respectively.

Regarding "ease of winding around the pulley", as shown in Table 5, in the example of the flat belt, the target value of the core wire spacing D2 is 1.8 mm (the core wire spacing D2 is D1 × 35%). The evaluation is Δ, and specifically, when the belt is wound around the pulley, the outer surface side 1x of the belt does not become a curved surface along the pulley and a corner portion is generated (that is, the followability to the shape of the pulley on the back surface of the belt is reduced). did).

As for "formability", as shown in Table 5, the evaluation is x in the belt having the target value of the core line spacing D2 of 0.2 mm (the core line spacing D2 is D1 x 4%) in the examples of the flat belt. Specifically, the core wire 12 of the first layer 10 was exposed, and the core wire 12 of the first layer 10 and the core wire 22 of the second layer 20 were crimped. Further, among the examples of the flat belt, the belt having the target value of the core wire spacing D2 of 1.8 mm (core wire spacing D2 is D1 × 35%) has an evaluation of Δ, and specifically, the measurement of the distance y1. The value became larger than the target value, and the core wire 12 was exposed from the belt outer surface side 1x.

Although preferred embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and various design changes can be made as long as they are described in the claims. It is a thing.

-The belt according to the present invention is not limited to the open end belt, and may be an endless belt. Further, the belt according to the present invention is not limited to being used in an elevating and lowering transport device, and can be used in any device.
-The constituent material of the main body is not limited to the above-mentioned materials as long as it is a thermoplastic elastomer.
-The constituent material of the core wire is not limited to the above-mentioned materials such as steel cord.
-It is not limited to performing the second layer forming step and the joining step at the same time. For example, after forming the first layer and the second layer individually, the first layer and the second layer may be joined by heat welding (that is, the joining step may be performed after the second layer forming step. Good).
-Reinforcing cloth may be provided on the outer surface side of the belt and / or the inner surface side of the belt.

1; 201; 301 Belt 1x Belt outer surface side 1y Belt inner surface side 10 1st layer 11 Main body 12 Core wire 20 2nd layer 21 Main body 22 Core wire 23 Tooth part D2 Core wire spacing

Claims (9)

In a toothed belt or a flat belt having a first layer and a second layer laminated in the belt thickness direction,
The first layer and the second layer each have a main body made of a thermoplastic elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt, and the main bodies heat each other. It is joined by welding and
The core wire contained in the first layer and the core wire contained in the second layer are separated from each other via the main body .
The distance D2 between the core wire included in the first layer and the core wire included in the second layer in the belt thickness direction is the tooth portion from the thickness of the entire belt when the belt is a toothed belt. The belt is characterized in that it is in the range of D1 × 6 to 33% when the value obtained by subtracting the thickness of the belt or the thickness of the entire belt when the belt is a flat belt is D1 . The thermoplastic elastomer constituting the main body is composed of a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, and a vinyl chloride-based thermoplastic elastomer. The belt according to claim 1, wherein the belt is at least one selected from the group. The belt according to claim 2 , wherein the thermoplastic elastomer constituting the main body is a polyurethane-based thermoplastic elastomer. The belt according to any one of claims 1 to 3 , wherein the core wire comprises a steel cord or a cord obtained by twisting at least one of an aramid fiber and a carbon fiber. The invention according to any one of claims 1 to 4 , wherein the diameter of the core wire contained in the first layer and the diameter of the core wire contained in the second layer are different from each other. belt. The first layer arranged on the outer surface side of the belt has a flat surface on the outer surface side of the belt and a surface on the inner surface side of the belt.
The second layer arranged on the inner surface side of the belt is characterized in that the surface on the outer surface side of the belt is flat and the tooth portion is provided on the surface on the inner surface side of the belt, according to any one of claims 1 to 5. The described belt. The first layer arranged on the outer surface side of the belt and the second layer arranged on the inner surface side of the belt are characterized in that both the outer surface side surface of the belt and the inner surface side surface of the belt are flat. Item 5. The belt according to any one of Items 1 to 5 . In the method of manufacturing a belt that is a toothed belt or a flat belt,
A first layer forming step of forming a first layer having a main body made of a thermoplastic elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt.
A second layer forming step of forming a second layer having a main body made of a thermoplastic elastomer and a core wire embedded in the main body and extending in the longitudinal direction of the belt.
A joining step is provided in which the second layer is laminated on one surface of the first layer in the belt thickness direction, and the main bodies are joined to each other by heat welding.
In the joining process
The core wire contained in the first layer and the core wire contained in the second layer are separated from each other via the main body .
The distance D2 between the core wire included in the first layer and the core wire included in the second layer in the belt thickness direction is determined from the thickness of the entire belt when the belt is a toothed belt. A method for manufacturing a belt , which comprises a value obtained by subtracting the thickness of the belt, or a range of D1 × 6 to 33%, where D1 is the thickness of the entire belt when the belt is a flat belt . The method for manufacturing a belt according to claim 8 , wherein the second layer forming step and the joining step are performed at the same time.

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