KR102350460B1 - toothed belt transmission - Google Patents

Abstract

The toothed belt transmission device 1 of the present invention has a toothed belt 10 having belt teeth 13 and a belt tooth bottom 14 alternately formed, and a pulley tooth 53 and a pulley to mesh with the toothed belt 10 . The toothed bottoms 54 comprise alternating toothed pulleys 50 . The tip of the belt tooth 13 is in contact with the pulley tooth bottom 54, but the tip of the pulley tooth 53 does not contact the belt tooth bottom 14, and the tip of the pulley tooth 53 and the belt tooth bottom ( 14), a gap S is provided.

Description

toothed belt transmission

In the present invention, a toothed belt in which a belt tooth and a belt tooth bottom are alternately formed, and a pulley tooth and a pulley tooth bottom to engage with the toothed belt alternately It relates to a toothed belt transmission having a toothed pulley formed of

BACKGROUND ART A toothed belt transmission device is widely used in the fields of general industry and agriculture as a lifting and lowering transport device, and is sometimes used as a blade angle adjusting device in a wind power generator. In a situation in which toothed belt transmission devices are used in various environments, the toothed belt of toothed belt transmission devices is required to have improved wear resistance. For example, Patent Documents 1 and 2 propose a technique for improving the wear resistance of a toothed belt.

Patent Document 1: Japanese Patent Laid-Open No. 2012-215248 Patent Document 2: Japanese Patent Laid-Open No. 7-158700

However, there is a limit to the improvement of wear resistance only by devising the material configuration of the toothed belt as in Patent Documents 1 and 2.

In particular, when used in a wind power generator, a phenomenon in which the toothed belt and the toothed pulley are alternately engaged by the wind causes a slight shaking phenomenon. In this case, the belt tooth bottom of the toothed belt is abraded by friction with the pulley tooth, which may lead to a decrease in the strength of the toothed belt and, further, to the fracture of the toothed belt.

It is an object of the present invention to provide a toothed belt transmission device capable of suppressing wear of the belt tooth bottom of the toothed belt.

According to the present invention, there is provided a toothed belt in which belt teeth and belt tooth bottoms are alternately formed, and a toothed pulley in which pulley teeth and pulley tooth bottoms are alternately formed to mesh with the toothed belt, and the tip of the belt tooth is the bottom of the pulley tooth and A toothed belt transmission is provided, wherein the tip of the pulley tooth does not contact the bottom of the belt tooth, and a gap is provided between the tip of the pulley tooth and the bottom of the belt tooth.

According to the present invention, power transmission is realized when the tip of the belt tooth contacts the bottom of the pulley tooth, and the tip of the pulley tooth does not contact the bottom of the belt tooth, and a gap is provided between them. Even if slight vibration occurs, the bottom of the belt tooth is not worn by friction with the pulley tooth, and the wear of the bottom of the belt tooth can be suppressed.

The gap may be 5 to 11% of the height of the belt teeth. If the gap is less than 5% of the height of the belt teeth, there may arise a problem that the wear of the bottom of the belt teeth cannot be suppressed. When the clearance exceeds 11% of the height of the belt teeth, wear of the bottom of the belt teeth can be suppressed, but there may arise a problem that the durability of the belt teeth is impaired. On the other hand, according to the said structure, these problems can be suppressed.

In the central position of the belt teeth in the height direction of the belt teeth, between the belt teeth and the pulley teeth, a backlash of 2.5 to 3.5% of the width of the belt teeth in the central position. ) is good. According to this configuration, it is possible to ensure the positioning accuracy between the belt teeth and the pulley teeth while preventing interference between the belt teeth and the pulley teeth and suppressing wear of the belt teeth.

The pitch of the belt teeth may be 14 mm or more, and the height of the belt teeth may be 5 mm or more. According to this configuration, it is possible to increase the load carrying capacity of the toothed belt.

The toothed belt may have a back surface portion facing the belt tooth in the height direction of the belt tooth, and a plurality of core wires embedded in the back surface portion, each of the plurality of core wires is , a steel cord, or a cord braided by combining at least any of aramid fibers and carbon fibers.

In addition, each of the plurality of core wires may be made of a steel cord, may have a strength of 7 to 8 kN, and may have a diameter of 2.3 to 2.6 mm. According to this configuration, it is possible to improve the belt strength per 1 mm of belt width of the toothed belt by using a steel cord having a feature of low elongation and high strength as a core wire.

The pitch of the plurality of core wires may be 3.0 to 3.7 mm, and the spacing between the plurality of core wires may be 0.4 to 1.4 mm. According to this configuration, it is possible to more reliably improve the belt strength per 1 mm of belt width of the toothed belt by a suitable combination of the pitch of the core wires and the spacing between the core wires.

The back surface portion and the belt teeth are integrally molded with a thermoplastic elastomer, and the thermoplastic elastomer includes a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer; and at least one selected from the group consisting of vinyl chloride-based thermoplastic elastomers.

The back surface portion and the belt teeth may be integrally molded with a polyurethane-based thermoplastic elastomer and a thermoplastic elastomer having a hardness of 38 to 53°. According to this structure, a toothed belt excellent in mechanical properties and durability is obtained. In addition, since the polyurethane-based thermoplastic elastomer is generally used for transmission belts and conveyance belts, the toothed belt can be easily manufactured. Moreover, as a kind of polyurethane constituting the polyurethane-based thermoplastic elastomer, polyether-type polyurethane, polyester-type polyurethane, or polycarbonate-type polyurethane may be used.

The belt strength per 1 mm of belt width of the toothed belt may be 1.85 kN or more. According to this configuration, it is possible to increase the load carrying capacity of the toothed belt.

A reinforcing cloth may be disposed on the surface of the belt tooth and on the surface of the bottom of the belt tooth. According to the said structure, it is possible to suppress abrasion of a belt tooth.

According to the present invention, power transmission is realized by bringing the tip of the belt tooth into contact with the bottom of the pulley tooth, and the tip of the pulley tooth does not contact the bottom of the belt tooth, but a gap is provided between them. Even if the vibration of the belt tooth occurs, the bottom of the belt tooth does not wear due to friction with the pulley tooth, and wear of the bottom of the belt tooth can be suppressed.

[Fig. 1] Fig. 1 is a side view (as seen from the arrow direction I in Fig. 2) showing a part (with reinforcing fabric) of a toothed belt transmission according to an embodiment of the present invention along the belt longitudinal direction.
[Fig. 2] Fig. 2 is a cross-sectional view along the belt width direction (along the line II-II in Fig. 1) showing a toothed belt included in a toothed belt transmission device according to an embodiment of the present invention.
[Fig. 3] Fig. 3 is a schematic diagram for explaining a method for manufacturing a toothed belt included in a toothed belt transmission according to an embodiment of the present invention.
[Fig. 4] Fig. 4 is a schematic diagram showing a running tester used in a running test.
[Fig. 5] Fig. 5 is a side view along the belt longitudinal direction showing a part (without reinforcing fabric) of a toothed belt transmission according to an embodiment of the present invention.

A toothed belt transmission device 1 according to an embodiment of the present invention includes a toothed belt 10 and a toothed pulley 50 as shown in FIG. 1 .

The toothed belt 10, as shown in FIGS. 1 and 2, includes a plurality of core wires 11, a back surface portion 12 in which a plurality of core wires 11 are embedded, a plurality of belt teeth 13, A belt having a plurality of belt tooth bottoms 14 and a reinforcement cloth 15 provided on the inner peripheral surface of the toothed belt 10 (the surface of the plurality of belt teeth 13 and the surface of the plurality of belt tooth bottoms 14). A main body 10a is provided.

In the present embodiment, each core wire 11 is made of a steel cord (a cord braided with steel fibers). The plurality of core wires 11 each extend in the belt longitudinal direction and are arranged in the belt width direction. In addition, in FIG. 1, the center position of the belt thickness direction of the core wire 11 is described as pitch line PL. This pitch line PL is a reference line in the belt longitudinal direction of the toothed belt 10 that does not expand and contract in the belt longitudinal direction even if the toothed belt 10 is bent along the outer periphery of the toothed pulley 50 and maintains the same length. .

The plurality of belt teeth 13 are arranged opposite to the back surface portion 12 in the belt thickness direction (the height direction of the belt teeth 13) and alternately spaced apart in the belt longitudinal direction. In the present embodiment, the back surface portion 12 and the plurality of belt teeth 13 are integrally molded with a thermoplastic elastomer. The thermoplastic elastomer constituting the back surface portion 12 and the plurality of belt teeth 13 is, in the present embodiment, a polyurethane-based thermoplastic elastomer, and has a hardness of 38 to 53° (according to JIS K6253: 2012, measured with a D-type durometer) )to be. The type of polyurethane constituting the polyurethane-based thermoplastic elastomer is polyether-type polyurethane, polyester-type polyurethane, or polycarbonate-type polyurethane.

The reinforcing fabric 15 is composed of a woven fabric in which weft and warp yarns are interlaced vertically and horizontally according to a certain rule. The weaving method of the woven fabric may be any of a twill weave, a main weave, and the like. The warp and weft yarns are formed by pulling filaments (long fibers) neatly, or braiding multifilament yarns (絲), monofilament yarns that are single long fibers (絲), and span yarns braiding short fibers together (絲). Any of (spun yarn) may be sufficient. When the warp or weft yarn is a multifilament yarn or a span yarn, a mixed yarn or a mixed yarn using a plurality of types of fibers may be used. As a material of the fibers constituting the reinforcing fabric 15, any one of nylon, aramid, polyester, polybenzoxazole, cotton, fluorine, or a combination thereof can be employed. In addition, the reinforcement cloth 15 may be provided also in the outer peripheral surface of the toothed belt 10, and may be provided only in the outer peripheral surface of the toothed belt 10. Moreover, it is good also as a structure which does not provide the reinforcement cloth 15 on the inner peripheral surface and outer peripheral surface of the toothed belt 10.

The belt tooth 13 and the belt tooth bottom 14 are formed alternately in the belt longitudinal direction. The belt tooth bottom 14 is a bottom of a recess formed between two belt teeth 13 adjacent in the belt longitudinal direction. In the present embodiment, the belt tooth bottom 14 is constituted by the back face portion 12 including the reinforcing fabric 15 .

In the present embodiment, the toothed belt 10 satisfies the following requirements.

ㆍ Belt width W = 20~200mm

ㆍ Belt thickness H = 9~15mm

ㆍ The sum of the thickness of the back portion 12 and the thickness of the reinforcing fabric 15 H12 = 4mm or more

ㆍ Height H13 of each belt tooth 13 (including the thickness of reinforcing fabric 15) = 5-12mm

ㆍ Pitch P13 of belt tooth (13) (distance on pitch line (PL)) = 14~25mm

ㆍ Diameter of each core wire (11) D = 2.3~2.6mm

ㆍ Strength of each core wire (11) = 7~7kN

ㆍ Core (11) pitch P11 = 3.0~3.7mm

ㆍ Spacing d between the core wires 11 = 0.4 to 1.4 mm (the sum of the spacing d is 13 to 36% of the belt width W)

• Belt strength per 1 mm of belt width = 1.85 kN or more and 2.60 kN or less.

The toothed pulley 50 meshes with the toothed belt 10, and has a plurality of pulley teeth 53 and a plurality of pulley tooth bottoms 54, as shown in FIG.

The pulley tooth 53 and the pulley tooth bottom 54 are alternately formed in the belt longitudinal direction. The pulley tooth bottom 54 is a bottom of a recess formed between two pulley teeth 53 adjacent in the belt longitudinal direction.

Belt teeth 13 are arranged in a recess formed between two pulley teeth 53 adjacent to each other in the belt longitudinal direction. A pulley tooth 53 is arranged in a recess formed between two belt teeth 13 adjacent in the belt longitudinal direction.

Here, the tip of the belt tooth 13 is in contact with the pulley tooth bottom 54, but the tip of the pulley tooth 53 does not contact the belt tooth bottom 14, and the tip of the pulley tooth 53 and the belt A gap S is provided between it and the tooth bottom 14 . In the present embodiment, the gap S is 5 to 11% of the height H13 of the belt teeth 13 .

Furthermore, in the present embodiment, in the central position O of the belt teeth 13 in the belt thickness direction (the height direction of the belt teeth), between the belt teeth 13 and the pulley teeth 53, backlash ( In a machine element used for a machine, such as a feed screw and a gear, that moves by being sandwiched between each other, a clearance B intentionally provided in the direction of motion) is provided. The backlash B is 2.5 to 3.5% of the width W13 of the belt tooth 13 in the central position O. In the present embodiment, between one belt tooth 13 and one pulley tooth 53 adjacent thereto in the longitudinal direction of the belt, and the one belt tooth 13 and the belt with respect thereto. Backlash B is provided in each between the one pulley tooth 53 adjacent to the other side in the longitudinal direction.

The toothed belt transmission device 1 can be used in a working environment in which the tension applied to the toothed belt 10 is always 0.35 kN/mm or more, and at the maximum, 0.80 to 0.95 kN/mm is applied, for example, It may be usable as a blade angle adjustment device in a wind power generator, a lifting/lowering transport device, and the like.

Next, an example of a manufacturing method of the toothed belt 10 will be described.

The toothed belt 10 is manufactured by a manufacturing apparatus 60 as shown in FIG. 3, for example. The manufacturing apparatus 60 includes a forming drum 61 , pulleys 62 and 63 arranged adjacent to the upper and lower sides of the forming drum 61 , and a pulley 64 arranged to face the forming drum 61 in the horizontal direction. ), a pressing band 65 which is an endless metal band wound around the pulleys 62 to 64, an extrusion head 66 for extruding the thermoplastic elastomer, and a core wire feeding device ( It has a reinforcing fabric supply device (not shown) and a reinforcement cloth supply device (not shown).

Grooves for forming the belt teeth 13 are formed in the outer peripheral surface of the forming drum 61 at predetermined intervals in the circumferential direction. The pulley 64 is movable in a horizontal direction in a horizontal direction with respect to the forming drum 61 , and applies a predetermined tension to the pressing band 65 . The pressing band 65 is disposed so as to be wrapped around the outer circumferential surface of the forming drum 61 by about half, and is pressed against the outer circumferential surface of the forming drum 61 by the application of tension from the pulley 64 .

A reinforcement cloth supply apparatus (not shown) supplies the reinforcement cloth 15 to the outer peripheral surface of the forming drum 61. A core wire supply device (not shown) supplies the plurality of core wires 11 parallel to the axial direction of the forming drum 61 on the outer peripheral surface side of the reinforcing fabric 15 supplied to the outer peripheral surface of the forming drum 61 . The extrusion head 66 supplies the thermoplastic elastomer in a melted state by heating to the outer peripheral surface side of the reinforcing cloth 15 and the core wire 11 supplied to the outer peripheral surface of the forming drum 61 .

The thermoplastic elastomer in a molten state, the plurality of core wires 11 , and the reinforcing cloth 15 supplied to the outer peripheral surface of the forming drum 61 accompany the rotation of the forming drum 61 , and the forming drum 61 and the pressing band It is wound between (65) and. At this time, by the pressing force of the pressing band 65, the thermoplastic elastomer is filled in the groove formed on the outer peripheral surface of the forming drum 61, and the belt teeth 13 are formed in the groove. In addition, at this time, the supplied reinforcement cloth 15 is filled in the groove|channel formed in the outer peripheral surface of the forming drum 61, and is arrange|positioned along the surface of the thermoplastic elastomer used as the belt tooth|tooth 13. As shown in FIG. Moreover, the back surface part 12 which embedded the some core wire 11 is formed between the reinforcement cloth 15 arrange|positioned on the outer peripheral surface of the shaping|molding drum 61, and the press band 65. As shown in FIG. Then, while the thermoplastic elastomer is strongly pressed against the outer peripheral surface of the forming drum 61 by the pressing force of the pressing band 65, the thermoplastic elastomer is cooled and solidified. The belt main body 10a is continuously taken out from the part where the pressing band 65 separated from the shaping|molding drum 61. As shown in FIG.

As described above, according to this embodiment, as shown in Fig. 1, power transmission is realized when the tip of the belt tooth 13 comes into contact with the pulley tooth bottom 54, and the pulley tooth 53. The tip of the belt tooth does not come into contact with the bottom 14 of the belt tooth and a gap S is provided between them. Without it, it is possible to suppress the wear of the belt tooth bottom 14 .

In the present embodiment, the gap S is 5 to 11% of the height H13 of the belt teeth 13 . If the gap S is less than 5% of the height H13 of the belt tooth 13, there may arise a problem that the wear of the belt tooth bottom 14 cannot be suppressed. When the gap S exceeds 11% of the height H13 of the belt teeth 13, wear of the belt tooth bottom 14 can be suppressed, but there may be a problem that the durability of the belt teeth 13 is impaired. . On the other hand, according to the said structure, these problems can be suppressed.

In the present embodiment, in the central position O of the belt teeth 13 in the belt thickness direction, between the belt teeth 13 and the pulley teeth 53, the belt teeth 13 at the central position O Backlash B of 2.5~3.5% of width W13 is provided. According to this configuration, while preventing interference between the belt teeth 13 and the pulley teeth 53 and suppressing wear of the belt teeth 13, the positioning accuracy between the belt teeth 13 and the pulley teeth 53 is ) is possible to obtain.

In this embodiment, the pitch P13 of the belt teeth 13 is 14 mm or more, and the height H13 of the belt teeth 13 is 5 mm or more. According to this configuration, it is possible to increase the load carrying capacity of the toothed belt 10 .

In the present embodiment, each core wire 11 of the toothed belt 10 is made of a steel cord, has a strength of 7 to 8 kN, and a diameter D of 2.3 to 2.6 mm. According to this configuration, by using a steel cord having the features of low elongation and high strength as the core wire 11, it is possible to improve the belt strength per 1 mm of belt width of the toothed belt 10.

In the present embodiment, the pitch P11 of the core wires 11 is 3.0 to 3.7 mm, and the spacing d between the core wires 11 is 0.4 to 1.4 mm. According to this configuration, by a suitable combination of the pitch P11 of the core wires 11 and the spacing d between the core wires 11 , it is possible to more reliably improve the belt strength per 1 mm of the belt width of the toothed belt 10 .

In the present embodiment, the back face portion 12 and the belt teeth 13 are integrally molded from a polyurethane-based thermoplastic elastomer and a thermoplastic elastomer having a hardness of 38 to 53°. According to this structure, the toothed belt 10 excellent in mechanical properties and durability is obtained. Further, since the polyurethane-based thermoplastic elastomer is generally used for transmission belts and conveyance belts, the toothed belt 10 can be easily manufactured.

In this embodiment, the belt strength per 1 mm of belt width of the toothed belt 10 is 1.85 kN or more. According to this configuration, it is possible to increase the load carrying capacity of the toothed belt 10 .

In this embodiment, the reinforcement cloth 15 is arrange|positioned on the surface of the belt tooth|gear 13 and the surface of the belt tooth bottom part 14. According to this configuration, it is possible to suppress wear of the belt teeth 10 .

In addition, in this embodiment, the belt teeth 10 provided with the reinforcement cloth 15 on the inner peripheral surface (the surface of the plurality of belt teeth 13 and the surface of the bottom portion 14 of the plurality of belt teeth) of the belt teeth 10 in this embodiment. Although described above, in the present invention, since the structure in which the reinforcing cloth 15 is not provided on the inner circumferential surface of the belt teeth 10 may be a configuration, the belt tooth 10 not provided with the reinforcing cloth 15 is shown in Fig. 5 is shown in

The toothed belt 110 has a plurality of core wires 11 , a back surface portion 12 in which a plurality of core wires 11 are embedded, a plurality of belt teeth 13 , and a bottom portion 14 with a plurality of belt teeth , a belt body 10a is provided. In addition, the toothed belt 110 has the same shape as the toothed belt 10 described in FIG. 1 except that the reinforcement cloth 15 is not provided, and the toothed belt 110 described in FIG. The code|symbol of the structure is common with the code|symbol of the structure of the toothed belt 110 described in FIG. 1, and description is abbreviate|omitted. However, the toothed belt 110 omits the configuration of the reinforcing fabric 15 from the contents described in the embodiment of the toothed belt 10, such as "the thickness of the back surface part 12 is H12 = 4 mm or more" One requirement needs to be satisfied.

Example

The inventor of the present application, by the above-described method, using a polyurethane-based or polyester-based thermoplastic elastomer to manufacture the toothed belts according to Examples 1-22 and Comparative Examples 1-2, running tests and A tensile test was performed. The structures and test results of each toothed belt according to Examples 1-22 and Comparative Examples 1-2 are shown in Tables 1 to 7 below.

Here, in Table 1, in order to compare the case where the value (distance) of the gap S between the tip of the pulley tooth and the bottom of the belt tooth is varied, the configurations of toothed belts of Examples 1 to 6 and Comparative Example 1 are shown. are described. In addition, in Table 2, in order to compare the case where the value (distance) of the backlash B between the belt teeth 13 and the pulley teeth 53 is varied, the structure of the toothed belts of Examples 3 and 7-11 is described. are doing In addition, in Table 3, in order to compare the case where the scale (tooth pitch P13, tooth height H13) of the toothed belt of a toothed belt was varied, the structure of the toothed belts of Examples 3 and 12-13 is described. In addition, in Table 4, in order to compare the cases in which the hardness of the belt teeth and the back surface integrally molded with a polyurethane-based (polyester-based) thermoplastic elastomer are varied, the structures of the toothed belts of Examples 3 and 14 to 16 are described. are doing Moreover, in Table 5, in order to compare the case where the pitch P11 of the core wire 11 was varied, the structure of the toothed belt of Example 3 and 17-18 was described. In addition, in Table 6, a toothed belt (Example 3) in which the back surface and belt teeth are integrally formed by a polyurethane-based thermoplastic elastomer, and a toothed belt in which the back surface and belt teeth are integrally formed by a polyester-based thermoplastic elastomer (implementation) Example 19) is described. In addition, in Table 7, in order to compare the case where the reinforcement cloth was provided on the inner peripheral surface of the toothed belt (the surface of the belt teeth and the surface of the bottom of the belt teeth) and the case where the reinforcement cloth was not provided, Examples 1, 3, 6, comparison The structures of the toothed belts of Example 1, Examples 20-22, and Comparative Example 2 are described.

In the running test, a test piece 10x having a width of 20 mm and a length of 3000 mm is taken from each toothed belt according to Examples 1-22 and Comparative Examples 1-2, and as shown in FIG. 4 , both ends of the test piece 10x Each of the weights 71 (1250N) and weights 72 and 7000N are suspended on the driving pulley 73 and driven pulley 74 of the lifting tester 70 (the number of teeth of each pulley 73 and 74 = 44) ) and a flat pulley 75 (diameter = 160 mm). Then, the traveling distance was 1000 mm and the driving was repeated at 1.2 million cycles (1 cycle in one reciprocation in the direction indicated by the arrow in Fig. 4), and the state of the belt teeth and the bottom of the belt teeth after the running test was evaluated (Tables 1 to 7). (Refer to the items of “Condition of the belt teeth” and “Condition of the bottom of the belt teeth”). In the evaluation of the “state of the belt teeth” and “the state of the bottom of the belt teeth” in Tables 1 to 7, “amount” means no wear, and “a” means wear to the extent that there is no problem in practical durability. The occurrence of , “unsuitable” means that abrasion has occurred significantly to the extent that it is impracticable.

In the tensile test, a test piece having a width of 20 mm and a length of 500 mm is taken from each toothed belt according to Examples 1-22 and Comparative Examples 1-2, and with respect to each test piece, tensile using an Amsler tensile tester. The test (tensile speed 50 mm/min) was done, and the belt strength until fracture|rupture was measured. The measurement was performed before and after the above-mentioned running test (refer to the items of "before running" and "after running" in "Belt strength" in Tables 1 to 7).

From the results of the running test and the tensile test, for each toothed belt related to Examples 1-22 and Comparative Examples 1-2, ranks A to C were given according to the standards shown in Table 8 below, , Tables 1 to 7 were described in the "judgment" item.

Among Examples 1 to 6 in which there was a gap S between the tip of the pulley tooth and the bottom of the belt tooth, Examples 2 to 5 were all A ranks. In Example 1 with the smallest gap S, slight wear occurred at the bottom of the belt teeth, and was ranked B. Also, the larger the gap S is provided, the more the belt tooth bottom does not come into contact with the pulley tooth when the pulley tooth and "G mesh", so the stress applied to the belt tooth is concentrated (if the belt tooth bottom is in contact with the pulley tooth, The stress is distributed between the belt teeth and the bottom of the belt teeth.) Therefore, in Example 6 with the largest gap S, stress tends to concentrate on the belt teeth, and wear of the belt teeth is easy to occur due to contact with the pulley teeth, It was rank B.

In Comparative Example 1, since there was no gap S between the tip of the pulley tooth and the bottom of the belt tooth, the belt tooth bottom was severely worn and was ranked C.

Examples 7 to 11 have the same configuration as Example 3 except that the backlash B is varied (the pitch P13 of the belt teeth is 14 mm, the pitch P13 of the belt teeth is relatively large, and the It is a toothed belt with high strength by the scale of the belt teeth (the length of the belt teeth in the belt longitudinal direction, and the height of the belt teeth H13) is large). Examples 9 and 10 were ranked A like Example 3, but in Examples 7 and 8 with a small amount of backlash, the belt teeth were abraded due to interference between the pulley teeth and the belt teeth, and were ranked B. In Example 11, which had a large amount of backlash, abrasion occurred in the belt teeth due to the interference between the pulley teeth and the belt teeth along with the deformation of the belt teeth, and was ranked B.

Examples 12 and 13 are large, high-strength toothed belts having the same configuration as in Example 3, and the tooth scale (the length of the teeth of the belt teeth in the belt longitudinal direction, and the height of the belt teeth H13) is made larger. Although it was a one-tooth belt, it was ranked A rank equally as in Example 3.

Examples 14 to 16, except for varying the hardness of the material (polyurethane-based thermoplastic elastomer) constituting the toothed belt, have the same configuration as Example 3 (the pitch of the belt teeth P13 is 14 mm), high-strength toothed belts to be. In a toothed belt with a small hardness, wear of the belt teeth tends to proceed due to deformation of the belt teeth. Therefore, in Example 14 (hardness of 30°), it was ranked B.

Examples 17 and 18 have the same configuration as Example 3 except that the core wire pitch P11 is varied (expanded) to reduce the number of core wires embedded in the toothed belt, and high strength with a large size (the pitch of the belt teeth P13 is 14 mm) is a toothed belt of By reducing the number of core wires, the belt strength was lower than in Example 3, but the belt strength was maintained at 1.85 kN/mm or more even after running, there was no wear of the belt teeth or the bottom of the belt teeth, and it was ranked B.

Example 19 is a high-strength toothed belt with a large size (the pitch of the belt teeth P13 is 14 mm) having the same configuration as Example 3 except that the type of material (thermoplastic elastomer) constituting the toothed belt is varied. The toothed belt of Example 19, in which the constituent material was a polyester-based thermoplastic elastomer, was ranked A rank, similar to that of Example 3 (polyurethane-based thermoplastic elastomer).

Comparative Example 2 is a toothed belt in which there is no gap S and the belt tooth bottom is not covered with a reinforcing cloth. The toothed belt of Comparative Example 2 had the most severe wear at the bottom of the toothed belt, and was ranked C. Moreover, even in the toothed belt of Comparative Example 1 in which there was no gap S but in which the belt tooth bottom was covered with the reinforcing cloth, the wear of the belt tooth bottom could not be suppressed and it was ranked C. Therefore, as in Examples 1-22, it was found that providing the gap S at the bottom of the toothed belt was effective in preventing wear of the bottom of the tooth of the belt and further improving the durability of the toothed belt.

Examples 20, 21, and 22 are toothed belts in which no reinforcement cloth is provided on the inner peripheral surface of the toothed belt (the surface of the belt tooth surface and the surface of the belt tooth bottom) with respect to Examples 1, 3 and 6. It turned out that there is no big difference in the state of abrasion of the belt tooth|gear and the belt tooth bottom part in a running test. With respect to the wear of the bottom of the belt teeth, the presence or absence of the reinforcement cloth had little effect, and the side with the reinforcement cloth was suppressed with respect to the wear of the belt teeth (however, in the judgment of this test, the rank was about the same).

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, As long as it describes in the claim, various design changes are possible.

- The toothed belt transmission device according to the present invention is not limited to being used as an angle adjusting device for a blade in a wind power generator, a lifting/lowering transport device, or the like, and may be used as any device.

• The toothed belt may be either open-end or endless.

ㆍThe thermoplastic elastomer constituting the back surface of the toothed belt and the plurality of belt teeth is not limited to the polyurethane-based thermoplastic elastomer, and includes, for example, a polyester-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer. A thermoplastic elastomer, a vinyl chloride type thermoplastic elastomer, etc. may be sufficient, and what combined 2 or more types of these may be sufficient. Moreover, the hardness of a thermoplastic elastomer is not limited to 38-53 degrees, You may be outside these ranges.

- The core wire of a toothed belt is not limited to what consists of a steel cord, For example, it may consist of a cord braided by combining at least any one of aramid fiber and carbon fiber.

This application is based on Japanese Patent Application No. 2017-106153 filed on May 30, 2017 and Japanese Patent Application No. 2018-96312 filed on May 18, 2018, the contents of which are incorporated herein by reference.

10 toothed belt
10a belt body
11 core wire
12 dorsal part
13 belt teeth
14 Belt tooth bottom
15 reinforcement gun
50 toothed pulley
53 pulley teeth
54 bottom of pulley tooth
d Interval between core wires
D core wire diameter
H13 Belt Tooth Height
P13 Belt Tooth Pitch
P11 core wire pitch
W13 Belt tooth width
S gap
B Backlash
O central position

Claims (11)

A toothed belt in which the belt tooth and the belt tooth bottom are alternately formed;
and a toothed pulley in which pulley teeth and pulley tooth bottoms are alternately formed to engage the toothed belt,
The pitch of the belt teeth is 14mm or more and 25mm or less,
The height of the belt teeth is 5mm or more and 12mm or less,
The tip of the belt tooth is in contact with the bottom of the pulley tooth,
The tip of the pulley tooth does not contact the bottom of the belt tooth, and a gap is provided between the tip of the pulley tooth and the bottom of the belt tooth,
The gap is 5-11% of the height of the belt tooth, toothed belt transmission. delete According to claim 1,
In the central position of the belt teeth in the height direction of the belt teeth, a backlash of 2.5 to 3.5% of the width of the belt teeth in the central position is provided between the belt teeth and the pulley teeth. with toothed belt transmission. delete According to claim 1,
The toothed belt has a back surface portion facing the belt tooth in the height direction of the belt tooth, and a plurality of core wires embedded in the back surface portion,
Each of the plurality of core wires is made of a steel cord or a cord braided by combining at least any of aramid fibers and carbon fibers, toothed belt transmission. 6. The method of claim 5,
Each of the plurality of core wires,
made of steel cord,
The strength is 7-8 kN,
Toothed belt transmission with a diameter of 2.3 to 2.6 mm. 7. The method of claim 6,
The pitch of the plurality of core wires is 3.0 to 3.7 mm,
The distance between the plurality of core wires is 0.4 to 1.4 mm, a toothed belt transmission. 6. The method of claim 5,
The back surface portion and the belt teeth are integrally molded with a thermoplastic elastomer, and the thermoplastic elastomer includes a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, and a polyamide-based thermoplastic elastomer; and at least one selected from the group consisting of vinyl chloride-based thermoplastic elastomers. 6. The method of claim 5,
The toothed belt transmission device, wherein the back surface portion and the belt teeth are integrally molded with a polyurethane-based thermoplastic elastomer and a thermoplastic elastomer having a hardness of 38 to 53°. According to claim 1,
The toothed belt transmission device, wherein the belt strength per 1 mm of the belt width of the toothed belt is 1.85 kN or more. 11. The method according to any one of claims 1, 3, 5 to 10,
Reinforcing cloth is disposed on the surface of the belt tooth and on the surface of the bottom of the belt tooth.

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