Elevator ropes

Abstract

Provided is an elevator rope for suspending a car in an elevator, comprising: a fiber core composed of high-strength synthetic fibers; a first steel wire layer composed of a plurality of first steel strands or a single steel wire twisted together, wound around the periphery of the fiber core; a first fiber layer composed of high-strength synthetic fibers arranged around the periphery of the first steel wire layer; and a second steel wire layer composed of a plurality of second steel strands or a single steel wire twisted together, wound around the periphery of the first fiber layer.

Description

Technical Field

[0001] The present disclosure relates to an elevator rope for suspending a car in an elevator. Background Art

[0002] As buildings become taller, elevator lifts are becoming increasingly common. High-lift elevators require larger diameters and lengths of elevator ropes, necessitating lightweight, high-strength ropes. Therefore, a method is known for using lightweight, strong, and high-strength synthetic fibers in the core of elevator ropes.

[0003] Patent Document 1 discloses an elevator rope having a structure in which multiple steel strands are wound around the periphery of a fiber core composed of high-strength synthetic fibers, and further steel strands are wound around the periphery of the fiber core. In this elevator rope, the fiber core is secured by two layers of steel strands, allowing the tensile load applied to the elevator rope to be fully transmitted to the fiber core.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: International Publication No. 2017 / 064808 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] However, in the elevator rope described in Patent Document 1, as the diameter of the fiber core increases with the diameter of the elevator rope, the tightening force generated by the steel strands cannot be transmitted to the center of the fiber core, and the load borne by the fiber core may not be sufficiently distributed. In this case, excessive load is applied to the steel strands, and the required strength of the elevator rope as a whole cannot be achieved.

[0009] Therefore, an object of the present disclosure is to provide an elevator rope that can increase the amount of high-strength synthetic fiber used to achieve weight reduction and can ensure the strength required for the entire elevator rope.

[0010] Means for solving problems

[0011] The elevator rope disclosed herein comprises: a fiber core composed of high-strength synthetic fibers; a first steel wire layer composed of a plurality of first steel strands or a single steel wire twisted together, wound around the periphery of the fiber core; a first fiber layer composed of high-strength synthetic fibers arranged around the periphery of the first steel wire layer; and a second steel wire layer composed of a plurality of second steel strands or a single steel wire twisted together, wound around the periphery of the first fiber layer.

[0012] Effects of the Invention

[0013] According to the elevator rope of the present disclosure, the amount of high-strength synthetic fiber used can be increased to achieve weight reduction, while ensuring the strength required for the entire elevator rope. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the first embodiment.

[0015] Figure 2 This is a side view showing a state in which each layer of the elevator rope according to the first embodiment is cut sequentially.

[0016] Figure 3 This is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modified example of the first embodiment.

[0017] Figure 4 This is a side view showing a state in which each layer of an elevator rope according to a modification of the first embodiment is cut sequentially.

[0018] Figure 5 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the second embodiment.

[0019] Figure 6 This is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modified example of the second embodiment.

[0020] Figure 7 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the third embodiment.

[0021] Figure 8 This is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modified example of the third embodiment.

[0022] Figure 9 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the fourth embodiment.

[0023] Figure 10 This is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modified example of the fourth embodiment.

[0024] Figure 11 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the fifth embodiment.

[0025] Figure 12 It is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modification of the fifth embodiment.

[0026] Figure 13 This is a cross-sectional view perpendicular to the longitudinal direction of the elevator rope according to the sixth embodiment.

[0027] Figure 14It is a cross-sectional view perpendicular to the longitudinal direction of an elevator rope according to a modification of the sixth embodiment. DETAILED DESCRIPTION

[0028] [First embodiment]

[0029] Hereinafter, the elevator rope 100 according to the first embodiment will be described. Figure 1 It is a cross-sectional view showing a cross section of the elevator rope 100 perpendicular to the longitudinal direction. Figure 2 This is a side view showing a state in which each layer of the elevator rope 100 is cut sequentially.

[0030] like Figure 1 and Figure 2 As shown, an elevator rope 100 includes a fiber core 11 composed of high-strength synthetic fibers, a first steel wire layer 12 composed of a plurality of first steel strands 12a twisted together, wound around the outer periphery of the fiber core 11, a first fiber layer 13 composed of high-strength synthetic fibers arranged around the outer periphery of the first steel wire layer 12, and a second steel wire layer 14 composed of a plurality of second steel strands 14a twisted together, wound around the outer periphery of the first fiber layer 13.

[0031] The fiber core 11 is formed by twisting together multiple fiber bundles. For example, multiple additional fiber bundles are arranged around the fiber bundle that serves as the core material and twisted together to form the fiber core 11. Each fiber bundle is composed of high-strength synthetic fibers. Examples of high-strength synthetic fibers include carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, and basalt fibers. Each fiber bundle can be, for example, a fiber bundle that is cured and integrated with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0032] The first steel wire layer 12 is formed by winding a plurality of first steel strands 12a formed by twisting a plurality of steel wires around the outer periphery of the fiber core 11. Figure 1 In the example shown, twelve first steel strands 12a are wound around the outer periphery of the fiber core 11. Each first steel strand 12a consists of a core wire and six side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are made of steel wire.

[0033] The first fiber layer 13 is a layer composed of high-strength synthetic fibers arranged on the periphery of the first steel wire layer 12. The first fiber layer 13 is formed, for example, by twisting a plurality of fiber bundles. Each fiber bundle is composed of high-strength synthetic fibers. Examples of high-strength synthetic fibers include carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, and basalt fibers. Each fiber bundle may be, for example, a fiber bundle cured and integrated with a resin such as an epoxy resin or a polyurethane resin, or a fiber bundle coated with a resin.

[0034] The second steel wire layer 14 is formed by winding a plurality of second steel strands 14a formed by twisting a plurality of steel wires around the outer periphery of the first fiber layer 13. Figure 1 In the example shown, eight second steel strands 14a are wound around the outer periphery of the first fiber layer 13. Each second steel strand 14a comprises a core wire, nine first side wires wound around the outer periphery of the core wire, and nine second side wires wound around the outer periphery of the first side wires. The core wire, first side wires, and second side wires are all made of steel wire. In the first embodiment, the second steel wire layer 14 is located at the outermost layer of the elevator rope 100 and is exposed to the outside.

[0035] As described above, the elevator rope 100 includes a fiber core 11 composed of high-strength synthetic fibers and a first fiber layer 13 composed of high-strength synthetic fibers. This increases the amount of high-strength synthetic fibers used, achieving weight reduction. Furthermore, the first steel wire layer 12 is provided on the periphery of the fiber core 11, and the second steel wire layer 14 is provided on the periphery of the first fiber layer 13. This allows the first steel wire layer 12 to secure the fiber core 11, while the second steel wire layer 14 secures the first fiber layer 13. Thus, tensile loads applied to the elevator rope 100 can be fully transmitted to the fiber core 11 and the first fiber layer 13, respectively. As a result, it is possible to prevent excessive loads from concentrating on the first steel wire layer 12 or the second steel wire layer 14, ensuring the required strength for the entire elevator rope 100.

[0036] The above structure is particularly effective when, for example, the diameter of elevator ropes is increasing (e.g., a diameter of 12 mm or more), and it is required to increase the amount of high-strength synthetic fiber used to achieve weight reduction. Furthermore, as the diameter of the elevator rope 100, the diameter of the circumscribed circle is measured at two or more cross sections at any point within 1.5 m from the end of the elevator rope 100, and the average value is used.

[0037] In addition, the higher the elevator's lifting height, the more preferably a weight compensating rope is installed in the elevator. However, according to the elevator rope 100, by achieving lightweighting, the weight imbalance caused by the elevator rope 100's own weight can be reduced, and the number or mass of the weight compensating ropes can be reduced or completely eliminated.

[0038] Furthermore, in the first embodiment described above, the fiber core 11 is described as being formed by twisting a plurality of fiber bundles. However, the plurality of fiber bundles may be arranged substantially in parallel and bundled without being twisted.

[0039] Furthermore, in the first embodiment described above, the number of first steel strands 12a constituting the first steel wire layer 12 and the structure of each first steel strand 12a can also be appropriately changed as needed. The number of second steel strands 14a constituting the second steel wire layer 14 and the structure of each second steel strand 14a can also be appropriately changed as needed.

[0040] [Modification of the First Embodiment]

[0041] Hereinafter, an elevator rope 101 which is a modified example of the first embodiment will be described. Figure 3 It is a cross-sectional view showing a cross section of the elevator rope 101 taken along a line perpendicular to the longitudinal direction. Figure 4 This is a side view showing a state in which each layer of the elevator rope 101 is cut sequentially.

[0042] like Figure 3 and Figure 4 As shown, the elevator rope 101 differs from the first embodiment in that it includes a resin coating 18 as the outermost layer. Specifically, in the elevator rope 100 of the first embodiment, the second steel wire layer 14 is exposed to the outside as the outermost layer of the elevator rope 100. In contrast, in the elevator rope 101 of this modified example, the outer periphery of the second steel wire layer 14 is coated with the coating 18. This improves the wear resistance and durability of the elevator rope 101.

[0043] The coating layer 18 is inserted between the adjacent second strands 14a. As the material of the coating layer 18, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0044] The higher the elevator's lifting height, the more preferable it is to install a weight-compensating rope in the elevator. However, the elevator rope 101 can achieve weight reduction and, by increasing the friction coefficient with the sheave, can suppress slippage with the sheave, enabling stable power transmission. As a result, the number and mass of weight-compensating ropes can be further reduced or completely eliminated.

[0045] [Second embodiment]

[0046] Hereinafter, an elevator rope 200 according to the second embodiment will be described. Figure 5 It is a cross-sectional view showing a cross section of the elevator rope 200 perpendicular to the longitudinal direction.

[0047] like Figure 5 As shown, the elevator rope 200 includes a fiber core 21 composed of high-strength synthetic fibers, a first steel wire layer 22 composed of a plurality of first steel strands 22a twisted together, and wound around the periphery of the fiber core 21. Furthermore, the elevator rope 200 includes a first fiber layer 23 composed of high-strength synthetic fibers arranged around the periphery of the first steel wire layer 22, a second steel wire layer 24 composed of a plurality of second steel strands 24a twisted together, and a second fiber layer 25 composed of high-strength synthetic fibers arranged around the periphery of the second steel wire layer 24. Furthermore, the elevator rope 200 includes a third steel wire layer 26 composed of a plurality of third steel strands 26a twisted together, and wound around the periphery of the second fiber layer 25.

[0048] The fiber core 21 is formed by twisting together multiple fiber bundles. For example, multiple additional fiber bundles are arranged around the fiber bundle that serves as the core material and twisted together to form the fiber core 21. Each fiber bundle is composed of high-strength synthetic fibers. Examples of high-strength synthetic fibers include carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, and basalt fibers. Each fiber bundle can be, for example, a fiber bundle that is cured and integrated with a resin such as epoxy resin or polyurethane resin, or a fiber bundle coated with a resin.

[0049] The first steel wire layer 22 is formed by winding a plurality of first steel strands 22a formed by twisting a plurality of steel wires around the outer periphery of the fiber core 21. Figure 5 In the example shown, twelve first steel strands 22a are wound around the outer periphery of the fiber core 21. Each first steel strand 22a consists of a core wire and six side wires wound around the outer periphery of the core wire. Both the core wire and the side wires are made of steel wire.

[0050] The first fiber layer 23 is a layer composed of high-strength synthetic fibers arranged on the periphery of the first steel wire layer 22. The first fiber layer 23 is formed, for example, by twisting a plurality of fiber bundles. Each fiber bundle is composed of high-strength synthetic fibers. Examples of high-strength synthetic fibers include carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, and basalt fibers. Each fiber bundle may be, for example, a fiber bundle cured and integrated with a resin such as an epoxy resin or a polyurethane resin, or a fiber bundle coated with a resin.

[0051] The second steel wire layer 24 is formed by winding a plurality of second steel strands 24a formed by twisting a plurality of steel wires around the outer periphery of the first fiber layer 23. Figure 5In the example shown, 21 second steel strands 24a are wound around the outer periphery of the first fiber layer 23. Each second steel strand 24a includes a core wire, nine first side wires wound around the outer periphery of the core wire, and nine second side wires wound around the outer periphery of the first side wires. The core wire, first side wires, and second side wires are all made of steel wire.

[0052] The second fiber layer 25 is a layer composed of high-strength synthetic fibers arranged on the outer periphery of the second steel wire layer 24. For example, the second fiber layer 25 is formed by twisting a plurality of fiber bundles. Each fiber bundle is composed of high-strength synthetic fibers. Examples of high-strength synthetic fibers include carbon fibers, glass fibers, poly(p-phenylene benzobisoxazole) (PBO) fibers, aromatic polyamide fibers, polyarylate fibers, and basalt fibers. Each fiber bundle can be, for example, a fiber bundle that is cured and integrated with a resin such as an epoxy resin or a polyurethane resin, or a fiber bundle coated with a resin.

[0053] The third steel wire layer 26 is formed by winding a plurality of third steel strands 26a formed by twisting a plurality of steel wires around the outer periphery of the second fiber layer 25. Figure 5 In the example shown, fifteen third steel strands 26a are wound around the outer periphery of the first fiber layer 23. Each third steel strand 26a comprises a core wire, nine first side wires wound around the outer periphery of the core wire, and nine second side wires wound around the outer periphery of the first side wires. The core wire, first side wires, and second side wires are all made of steel wire. In the second embodiment, the third steel wire layer 26 is located at the outermost layer of the elevator rope 200 and is exposed to the outside.

[0054] As described above, the elevator rope 200 includes, in addition to the fiber core 21 composed of high-strength synthetic fibers, a first fiber layer 23 and a second fiber layer 25 also composed of high-strength synthetic fibers. This increases the amount of high-strength synthetic fibers used, thereby achieving weight reduction. Furthermore, the first steel wire layer 22 is provided on the periphery of the fiber core 21, and the second steel wire layer 24 is provided on the periphery of the first fiber layer 23. Furthermore, the third steel wire layer 26 is provided on the periphery of the second fiber layer 25. This allows the fiber core 21 to be secured by the first steel wire layer 22, while the first fiber layer 23 is secured by the second steel wire layer 24. Furthermore, the second fiber layer 25 is secured by the third steel wire layer 26. Consequently, tensile loads applied to the elevator rope 200 can be fully transmitted to the fiber core 21, the first fiber layer 23, and the second fiber layer 25. As a result, the concentration of excessive load on the first steel wire layer 22, the second steel wire layer 24, or the third steel wire layer 26 can be suppressed, ensuring the required strength for the entire elevator rope 200. The above structure is particularly effective when, for example, the diameter of elevator ropes increases (for example, a diameter of 18 mm or more), and it is required to increase the amount of high-strength synthetic fibers used to achieve weight reduction.

[0055] Furthermore, in the second embodiment described above, the fiber core 21 is described as being formed by twisting a plurality of fiber bundles. However, the plurality of fiber bundles may be arranged substantially in parallel and bundled without being twisted.

[0056] Furthermore, in the second embodiment described above, the number of first steel strands 22a constituting the first steel wire layer 22 and the structure of each first steel strand 22a can also be appropriately changed as needed. The number of second steel strands 24a constituting the second steel wire layer 24 and the structure of each second steel strand 24a can also be appropriately changed as needed. Furthermore, the number of third steel strands 26a constituting the third steel wire layer 26 and the structure of each third steel strand 26a can also be appropriately changed as needed.

[0057] Furthermore, in the second embodiment described above, a buffer layer made of resin may be provided at at least one of the locations between the fiber core 21 and the first steel wire layer 22, between the first steel wire layer 22 and the first fiber layer 23, and between the first fiber layer 23 and the second steel wire layer 24. Furthermore, a buffer layer made of resin may be provided at at least one of the locations between the second steel wire layer 24 and the second fiber layer 25, and between the second fiber layer 25 and the third steel wire layer 26. In locations where the buffer layer is provided, wear of the fiber core 21, the first fiber layer 23, or the second fiber layer 25, which would otherwise be caused by direct contact between adjacent layers, can be suppressed.

[0058] [Modification of the Second Embodiment]

[0059] Hereinafter, an elevator rope 201 which is a modified example of the second embodiment will be described. Figure 6 2 is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 201. Figure 6 As shown, the elevator rope 201 differs from the second embodiment in that it includes a resin coating 28 as the outermost layer. Specifically, in the elevator rope 200 of the second embodiment, the third steel wire layer 26 is exposed to the outside as the outermost layer of the elevator rope 200. In contrast, in the elevator rope 201 of this modified example, the outer periphery of the third steel wire layer 26 is coated with the coating 28. This improves the wear resistance and durability of the elevator rope 201.

[0060] The coating layer 28 is inserted between adjacent third strands 26a. As the material of the coating layer 28, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0061] [Third embodiment]

[0062] Hereinafter, an elevator rope 300 according to a third embodiment will be described. Figure 7This is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of an elevator rope 300. The elevator rope 300 differs from the first embodiment in that a buffer layer made of resin is provided between the fiber core 11 and the first steel wire layer 12, between the first steel wire layer 12 and the first fiber layer 13, and between the first fiber layer 13 and the second steel wire layer 14. In the following description, these differences are explained, and description of the same structures as the first embodiment is omitted.

[0063] like Figure 7 As shown, the elevator rope 300 includes a first buffer layer 37a made of resin between the fiber core 11 and the first steel wire layer 12. This prevents wear of the fiber core 11 due to direct contact between the fiber core 11 and the first steel wire layer 12. Furthermore, a second buffer layer 37b made of resin is provided between the first steel wire layer 12 and the first fiber layer 13. This prevents wear of the first fiber layer 13 due to direct contact between the first steel wire layer 12 and the first fiber layer 13. Furthermore, a third buffer layer 37c made of resin is provided between the first fiber layer 13 and the second steel wire layer 14. This prevents wear of the first fiber layer 13 due to direct contact between the first and second steel wire layers 13 and 14. The first, second, and third buffer layers 37a, 37b, and 37c are made of a resin with wear resistance and low friction, such as polyethylene or polypropylene.

[0064] In the third embodiment described above, a buffer layer made of resin is provided at three locations: between the fiber core 11 and the first steel wire layer 12, between the first steel wire layer 12 and the first fiber layer 13, and between the first fiber layer 13 and the second steel wire layer 14. However, instead, a buffer layer may be provided at only one or two of these locations. This can suppress wear of the fiber core 11 or the first fiber layer 13 at the locations where the buffer layer is provided. In other words, a buffer layer is provided at at least one of the locations: between the fiber core 11 and the first steel wire layer 12, between the first steel wire layer 12 and the first fiber layer 13, and between the first fiber layer 13 and the second steel wire layer 14.

[0065] [Modification of the Third Embodiment]

[0066] Hereinafter, an elevator rope 301 which is a modified example of the third embodiment will be described. Figure 8 : is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 301. Figure 8As shown, the elevator rope 301 differs from the third embodiment in that it includes a resin coating 38 as the outermost layer. Specifically, in the elevator rope 300 of the third embodiment, the second steel wire layer 14 is exposed to the outside as the outermost layer of the elevator rope 300. In contrast, in the elevator rope 301 of this modified example, the outer periphery of the second steel wire layer 14 is coated with the coating 38. This improves the wear resistance and durability of the elevator rope 301.

[0067] The coating layer 38 is inserted between adjacent second strands 14a. As the material of the coating layer 38, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0068] [Fourth embodiment]

[0069] Hereinafter, an elevator rope 400 according to a fourth embodiment will be described. Figure 9 : is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 400. Figure 9 As shown, the elevator rope 400 differs from the first embodiment in that it includes a resin coating 49 that coats each first steel strand 12a of the first steel wire layer 12. Otherwise, there are no substantial differences. This prevents wear of the fiber core 11 due to direct contact between the fiber core 11 and the first steel strand 12a. Furthermore, wear of the first fiber layer 13 due to direct contact between the first steel strand 12a and the first fiber layer 13 can be prevented. A resin with wear resistance and low friction, such as polyethylene or polypropylene, is used as the material for the coating 49.

[0070] [Modification of the Fourth Embodiment]

[0071] Hereinafter, an elevator rope 401 which is a modified example of the fourth embodiment will be described. Figure 10 : is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 401. Figure 10 As shown, the elevator rope 401 differs from the fourth embodiment in that it includes a resin coating 48 as the outermost layer. Specifically, in the elevator rope 400 of the fourth embodiment, the second steel wire layer 14 is exposed to the outside as the outermost layer of the elevator rope 400. In contrast, in the elevator rope 401 of this modified example, the outer periphery of the second steel wire layer 14 is coated with the coating 48. This improves the wear resistance and durability of the elevator rope 401.

[0072] The coating layer 48 enters between the adjacent second strands 14a. As the material of the coating layer 48, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0073] [Fifth embodiment]

[0074] Hereinafter, an elevator rope 500 according to a fifth embodiment will be described. Figure 11 This is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of an elevator rope 500. The elevator rope 500 differs from the first embodiment in that the first steel wire layer 52 is constructed by winding a plurality of single steel wires 52a around the periphery of a fiber core 11. In contrast, in the first embodiment, the first steel wire layer 12 is constructed by winding a plurality of first steel strands 12a, formed by twisting a plurality of steel wires, around the periphery of a fiber core 11.

[0075] [Modification of the Fifth Embodiment]

[0076] Hereinafter, an elevator rope 501 which is a modified example of the fifth embodiment will be described. Figure 12 : is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 501. Figure 12 As shown, the elevator rope 501 differs from the fifth embodiment in that it includes a resin coating 58 as the outermost layer. Specifically, in the elevator rope 500 of the fifth embodiment, the second steel wire layer 14 is exposed to the outside as the outermost layer of the elevator rope 500. In contrast, in the elevator rope 501 of this modified example, the outer periphery of the second steel wire layer 14 is coated with the coating 58. This improves the wear resistance and durability of the elevator rope 501.

[0077] The coating layer 58 is inserted between adjacent second strands 14a. As the material of the coating layer 58, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0078] [Sixth embodiment]

[0079] Hereinafter, an elevator rope 600 according to the sixth embodiment will be described. Figure 13 This is a cross-sectional view showing a section perpendicular to the longitudinal direction of an elevator rope 600. The elevator rope 600 differs from the elevator rope of the first embodiment in that each first steel strand 62a constituting the first steel wire layer 62 has a core wire 621 made of high-strength synthetic fiber inside it, and each second steel strand 64a constituting the second steel wire layer 64 has a core wire 641 made of high-strength synthetic fiber inside it. In the following description, these differences are explained, and description of the same structures as the first embodiment is omitted.

[0080] The first steel wire layer 62 has six first steel strands 62a wound around the outer periphery of the fiber core 11. Each first steel strand 62a includes a core wire 621, twelve first side wires 622 wound around the outer periphery of the core wire 621, and twelve second side wires 623 wound around the outer periphery of the first side wires 622. The core wire 621 is made of high-strength synthetic fiber, and the first side wires 622 and second side wires 623 are both made of steel wire.

[0081] The second steel wire layer 64 has 18 second steel strands 64a wound around the outer periphery of the first fiber layer 13. Each second steel strand 64a includes a core wire 641, 12 first side wires 642 wound around the outer periphery of the core wire 641, and 12 second side wires 643 wound around the outer periphery of the first side wires 642. The core wire 641 is made of high-strength synthetic fiber, while the first side wires 642 and the second side wires 643 are both made of steel wire. In the sixth embodiment, the second steel wire layer 64 is located at the outermost layer of the elevator rope 600 and is exposed to the outside.

[0082] As described above, the elevator rope 600 includes a core wire 621 made of high-strength synthetic fiber inside each first steel strand 62a, and includes a core wire 641 made of high-strength synthetic fiber inside each second steel strand 64a. This allows the use of an increased amount of high-strength synthetic fiber, thereby achieving weight reduction, compared to a case where a core wire made of steel wire is included inside the first steel strand 62a or the second steel strand 64a.

[0083] In addition, in the above-mentioned sixth embodiment, the case where the first steel strand 62a constituting the first steel wire layer 62 and the second steel strand 64a constituting the second steel wire layer 64 are both provided with a core wire composed of high-strength synthetic fibers is described, but it is also possible to provide a core wire composed of high-strength synthetic fibers only in one of them.

[0084] Furthermore, each first steel strand 62a may be provided with a resin coating that covers the core wire 621. This can suppress wear of the core wire 621 due to direct contact between the core wire 621 and the first side wire 622. Furthermore, each second steel strand 64a may be provided with a resin coating that covers the core wire 641. This can suppress wear of the core wire 641 due to direct contact between the core wire 641 and the first side wire 642.

[0085] [Modification of the Sixth Embodiment]

[0086] Hereinafter, an elevator rope 601 which is a modified example of the sixth embodiment will be described. Figure 14 : is a cross-sectional view showing a cross section perpendicular to the longitudinal direction of the elevator rope 601. Figure 14As shown, the elevator rope 601 differs from the sixth embodiment in that it includes a resin coating 68 as the outermost layer. Specifically, in the elevator rope 600 of the sixth embodiment, the second steel wire layer 64 is exposed to the outside as the outermost layer of the elevator rope 600. In contrast, in the elevator rope 601 of this modified example, the outer periphery of the second steel wire layer 64 is coated with the coating 68. This improves the wear resistance and durability of the elevator rope 601.

[0087] The coating layer 68 is inserted between the adjacent second strands 64a. As the material of the coating layer 68, a resin having a sufficient friction coefficient, such as an elastomer resin or polyurethane, is used to ensure traction with the sheave.

[0088] In each of the first, third, and sixth embodiments described above, a structure comprising a fiber core, a first steel wire layer, a first fiber layer, and a second steel wire layer in this order was described as a structure capable of increasing the amount of high-strength synthetic fiber used and achieving weight reduction when the diameter of the elevator rope is increased. In this structure, the high-strength fiber layer includes the fiber core, essentially forming two layers. Furthermore, in the second embodiment described above, a structure comprising a second fiber layer and a third steel wire layer was further described. In this structure, the high-strength fiber layer includes the fiber core, essentially forming three layers. The number of fiber layers and steel wire layers can be appropriately increased depending on the degree of increase in the diameter of the elevator rope.

[0089] Furthermore, the characteristic structures described in the above-mentioned embodiments 3 to 6 can be applied to the case where one fiber layer and one steel wire layer are added as described in the second embodiment, or to the case where the fiber layer and the steel wire layer are further added according to the degree of increase in the diameter of the elevator rope.

[0090] Furthermore, in each of the above embodiments, a buffer layer may be provided at at least one of the plurality of locations where the layer composed of high-strength synthetic fibers and the layer composed of steel wires are adjacent. This allows the buffer layer to suppress wear of the layer composed of high-strength synthetic fibers caused by direct contact between the adjacent layers at the location where the buffer layer is provided.

[0091] Description of labels

[0092] 11, 21: fiber core;

[0093] 12, 22, 52, 62: first steel wire layer;

[0094] 12a, 22a, 62a: first steel strand;

[0095] 52a: steel wire;

[0096] 13, 23: first fiber layer;

[0097] 14, 24, 64: second steel wire layer;

[0098] 14a, 24a, 64a: second steel strand;

[0099] 18, 28, 38, 48, 58, 68: coating;

[0100] 25: second fiber layer;

[0101] 26: the third steel wire layer;

[0102] 26a: third steel strand;

[0103] 37a: first buffer layer;

[0104] 37b: second buffer layer;

[0105] 37c: third buffer layer;

[0106] 49: Encapsulation;

[0107] 100, 101, 200, 201, 300, 301, 400, 401, 500, 501, 600, 601: elevator ropes;

[0108] 621, 641: core wire;

[0109] 622, 642: first lateral line;

[0110] 623, 643: Second side line.

Claims

1. An elevator rope comprising: a fiber core composed of high-strength synthetic fibers; a first steel wire layer formed by winding a plurality of first steel strands or a single steel wire formed by twisting a plurality of steel wires around the outer periphery of the fiber core; a first fiber layer composed of high-strength synthetic fibers disposed on the periphery of the first steel wire layer; as well as The second steel wire layer is formed by winding a plurality of second steel strands or a single steel wire formed by twisting a plurality of steel wires around the outer periphery of the first fiber layer.

2. The elevator rope according to claim 1, wherein The fiber core is formed by twisting a plurality of high-strength synthetic fiber bundles.

3. The elevator rope according to claim 1, wherein The first steel strand is composed of a core wire and a plurality of side wires wound around the outer circumference of the core wire, and both the core wire and the side wires are composed of steel wires.

4. The elevator rope according to claim 2, wherein: The first steel strand is composed of a core wire and a plurality of side wires wound around the outer circumference of the core wire, and both the core wire and the side wires are composed of steel wires.

5. The elevator rope according to claim 3, wherein The first steel strand includes a core wire made of high-strength synthetic fiber instead of the core wire made of steel wire.

6. The elevator rope according to claim 4, wherein The first steel strand includes a core wire made of high-strength synthetic fiber instead of the core wire made of steel wire.

7. The elevator rope according to any one of claims 1 to 6, wherein: A buffer layer made of resin is provided at at least one location between the fiber core and the first steel wire layer, between the first steel wire layer and the first fiber layer, and between the first fiber layer and the second steel wire layer.

8. The elevator rope according to any one of claims 1 to 6, wherein: The elevator rope further comprises: a second fiber layer composed of high-strength synthetic fibers disposed on an outer periphery of the second steel wire layer; and The third steel wire layer is formed by winding a plurality of third steel strands formed by twisting a plurality of steel wires around the outer periphery of the second fiber layer.

9. The elevator rope according to claim 7, wherein: The elevator rope further comprises: a second fiber layer composed of high-strength synthetic fibers disposed on an outer periphery of the second steel wire layer; and The third steel wire layer is formed by winding a plurality of third steel strands formed by twisting a plurality of steel wires around the outer periphery of the second fiber layer.

10. The elevator rope according to claim 8, wherein A buffer layer made of resin is provided at least at one location between the second steel wire layer and the second fiber layer and between the second fiber layer and the third steel wire layer.

11. The elevator rope according to claim 9, wherein A buffer layer made of resin is provided at at least one location between the second steel wire layer and the second fiber layer and between the second fiber layer and the third steel wire layer.

12. The elevator rope according to any one of claims 1 to 6 and 9 to 11, wherein: The elevator rope includes a resin coating layer as an outermost layer.

13. The elevator rope according to claim 7, wherein: The elevator rope includes a resin coating layer as an outermost layer.

14. The elevator rope according to claim 8, wherein The elevator rope includes a resin coating layer as an outermost layer.

Images