Rope system

Abstract

The invention provides a rope system which can restrain service life shortening and can be easily manufactured. The rope system is provided with: a pulley which is provided so as to be rotatable and in which a crown part, the outer diameter of which decreases from the center toward the end side in the direction of the rotational axis, is formed; and a rope that has a rectangular cross-section perpendicular to the longitudinal direction and is wound around the pulley so that the width direction faces the direction of the rotation axis, the rope including a first portion and a second portion that differ in position in the width direction, the first portion being located further toward the center in the width direction than the second portion in the width direction, and the second portion being located further toward the center in the width direction than the second portion. A spring constant of the first portion is smaller than a spring constant of the second portion.

Description

Technical Field

[0001] The present disclosure relates to a rope system. Background Art

[0002] Patent document 1 discloses a rope system. In this rope system, a crown, which is an inverted U-shaped arc surface, is formed on a pulley to prevent the belt rope from bending. In order to prevent the belt life from being shortened due to the formation of the crown, the surface shape of the belt rope is formed into an arc shape along the shape of the crown. Therefore, it is possible to prevent the surface pressure between the belt rope and the surface of the pulley from becoming uneven due to the position.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2010-540374 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the rope system described in Patent Document 1, the shape of the covering member of the belt rope is a complicated shape. In addition, the shape is required to be formed with high precision. Therefore, the rope manufacturing becomes difficult.

[0008] The present disclosure is made to solve the above-mentioned problems. An object of the present disclosure is to provide a rope system that can suppress shortening of the life and can be easily manufactured.

[0009] Solutions to Solve Problems

[0010] The rope system disclosed in the present invention comprises: a pulley, which is arranged to be rotatable and is formed with a crown whose outer diameter decreases from the center toward the end side in the direction of the rotation axis; and a rope, the cross-section of which is perpendicular to the length direction is formed into a rectangle, and is wound on the pulley in a manner such that the width direction is toward the direction of the rotation axis, the rope having: a plurality of supporting members, which are respectively arranged throughout the length direction of the rope and arranged in the width direction; and a covering member, which covers the plurality of supporting members throughout the length direction of the rope, has a contact surface, and contacts the pulley at the contact surface, the plurality of supporting members including a first supporting member and a second supporting member, the first supporting member being located in the width direction at a position closer to the center side of the width direction than the second supporting member, and in the cross-section, a distance from a second center of gravity position of tension acting in the length direction of the second supporting member to the contact surface is greater than a distance from a first center of gravity position of tension acting in the length direction of the first supporting member to the contact surface.

[0011] The rope system disclosed in the present invention comprises: a pulley, which is arranged to be rotatable and is formed with a crown portion whose outer diameter decreases from the center toward the end side in the direction of the rotation axis; and a rope, which has a rectangular cross-section perpendicular to the length direction and is wound on the pulley in a manner such that the width direction is toward the direction of the rotation axis, the rope including a first part and a second part with different positions in the width direction, the first part being located in the width direction closer to the center side of the width direction than the second part, and the spring constant of the first part being smaller than the spring constant of the second part.

[0012] Effects of the Invention

[0013] According to the present disclosure, a crown is formed on the pulley. In addition, the cross section of the rope is formed into a rectangular shape. In the rope, the distance from the second center of gravity position of the tension to the contact surface is greater than the distance from the first center of gravity position of the tension to the contact surface. Alternatively, in the rope, the spring constant of the first part is smaller than the spring constant of the second part. Therefore, it is possible to suppress the shortening of the service life and to easily manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing an overview of an elevator apparatus to which the rope system in the first embodiment is applied.

[0015] Figure 2 This is a cross-sectional view of a main part of the pulley of the rope system in the first embodiment.

[0016] Figure 3 This is a perspective view of a main portion of a main rope of the rope system in Embodiment 1.

[0017] Figure 4 This is a diagram showing an AA cross section of a main rope of the rope system in the first embodiment.

[0018] Figure 5 This is an enlarged view of a cross section of a supporting member of the rope system in the first embodiment.

[0019] Figure 6 This is a cross-sectional view of a main portion of the rope system in the first embodiment.

[0020] Figure 7 This is a cross-sectional view of a main portion of the rope system in the first embodiment.

[0021] Figure 8 This is a cross-sectional view of a main part of a comparative example that is different from the rope system in the first embodiment.

[0022] Fig. 9 This is a cross-sectional view of the main rope of the rope system in the second embodiment.

[0023] Fig.10This is a cross-sectional view of the main rope of the rope system in the second embodiment.

[0024] Fig.11 This is a cross-sectional view of the main rope of the rope system in the second embodiment.

[0025] Fig.12 This is a cross-sectional view of the main rope of the rope system in the third embodiment.

[0026] Fig.13 It is a cross-sectional view of the main rope and the drive winch of the rope system in the third embodiment.

[0027] Fig.14 This is a cross-sectional view of a main portion of the rope system in the third embodiment.

[0028] Fig.15 This is a cross-sectional view of a first modified example of the main rope of the rope system in the third embodiment.

[0029] Fig.16 This is a cross-sectional view of a second modified example of the main rope of the rope system in the third embodiment.

[0030] Fig.17 This is a cross-sectional view of a third modified example of the main rope of the rope system in the third embodiment. DETAILED DESCRIPTION

[0031] The embodiment of the present disclosure will be described with reference to the accompanying drawings. In addition, in each figure, the same or corresponding parts are marked with the same reference numerals. The repeated description of the parts is appropriately simplified or omitted.

[0032] Implementation Method 1

[0033] Figure 1 This is a diagram showing an overview of an elevator apparatus to which the rope system in the first embodiment is applied.

[0034] exist Figure 1 In the elevator device 1, the lifting passage 2 runs through each floor of the building 3. The lifting passage 2 is a space extending along the lifting direction of the building 3. The machine room 4 is arranged just above the lifting passage 2. Figure 1 In the figure, an elevator device 1 of a 1:1 roping method is shown as an example. The elevator device 1 includes a rope system 5 .

[0035] The rope system 5 includes a driving winch 6, a deflection wheel 7, and a plurality of main ropes 8. The driving winch 6 is provided as a pulley inside the machine room 4. The deflection wheel 7 is provided as a pulley inside the machine room 4. The deflection wheel 7 is provided rotatably around a rotation axis. The plurality of main ropes 8 each have the same structure. Figure 1 One of the main ropes 8 is shown. The main rope 8 is wound around the drive winch 6 and the deflector wheel 7.

[0036] The hoisting machine 9 includes a motor 10 and a brake 11. The hoisting machine 9 also includes a drive capstan 6. The motor 10 is provided in the machine room 4. The drive capstan 6 is fixed to the drive shaft of the motor 10. The brake 11 is provided so as to be able to apply a braking force to the drive capstan 6.

[0037] The car guide rail 12 is disposed inside the hoistway 2. The length direction of the car guide rail 12 is toward the direction in which the hoistway 2 extends. The counterweight guide rail 13 is disposed inside the hoistway 2. The length direction of the counterweight guide rail 13 is toward the direction in which the hoistway 2 extends.

[0038] The car 14 is provided adjacent to the car guide rail 12 inside the hoistway 2. The car 14 is suspended on one side of the main rope 8. The car 14 includes a car frame 14a and a car chamber 14b. The car frame 14a is attached to one end of the main rope 8 via a one-side holding system 15. The car chamber 14b is a room of the elevator device 1 for loading objects such as passengers and luggage. The car chamber 14b supports the load on the car frame 14a.

[0039] The counterweight 16 is arranged adjacent to the counterweight guide rail 13 inside the hoistway 2. The counterweight 16 is suspended on the other side of the main rope 8. Specifically, the counterweight 16 is installed on the other end of the main rope 8 via the other side holding system 17.

[0040] The control panel 18 is provided in the machine room 4. The control panel 18 can control the elevator device 1 as a whole. For example, the control panel 18 controls the operation of the car 14.

[0041] When the elevator device 1 is in normal operation, the control panel 18 drives the motor 10 of the hoist 9. The drive shaft of the motor 10 rotates. The drive sheave 6 rotates with the drive shaft as the rotation axis. The plurality of main ropes 8 move following the rotation of the drive sheave 6 by the friction between them and the drive sheave 6. The deflection wheel 7 rotates following the movement of the plurality of main ropes 8 by the friction between them and each of the plurality of main ropes 8. The car 14 and the counterweight 16 move up and down in opposite directions along the lifting direction following the movement of the plurality of main ropes 8. At this time, the car 14 moves up and down in the direction in which the lifting passage 2 extends while being guided by the car guide rail 12. The counterweight 16 moves up and down in the direction in which the lifting passage 2 extends while being guided by the counterweight guide rail 13. Thereafter, the control panel 18 sends a command to stop the car 14. The brake 11 applies a braking force to the drive sheave 6. The car 14 stops when the drive sheave 6 stops. The brake 11 keeps the driving winch 6 stationary by continuously applying a braking force to the driving winch 6 .

[0042] In addition, Figure 1, the elevator device 1 is provided with a machine room 4, but the elevator device 1 may be provided without a machine room 4. In this case, the hoist 9, the deflection wheel 7, and the control panel 18 may also be arranged inside the hoistway 2. The hoist 9, the deflection wheel 7, and the control panel 18 may be arranged at the bottom of the hoistway 2 or at the top.

[0043] In addition, the elevator device 1 may adopt a roping method other than the 1:1 roping method. For example, the elevator device 1 may be an elevator of the 2:1 roping method. In this case, one end of the main rope 8 may be fixed to a fixed body provided in the hoistway 2 or the machine room 4 via the one-side holding system 15. The other end of the main rope 8 may be fixed to a fixed body provided in the hoistway 2 or the machine room 4 via the other-side holding system 17.

[0044] Next, use Figure 2 The drive winch 6 or the deflector pulley 7 as the pulley is described.

[0045] Figure 2 2 is a cross-sectional view of a main part of a pulley of a rope system in Embodiment 1. Figure 2 In the figure, the illustration of the plurality of main ropes 8 is omitted.

[0046] Figure 2 A cross-sectional view based on a plane including a rotating shaft of a driving reel 6 as a pulley is shown. A crown is formed on the driving reel 6. The crown is the shape of the outer peripheral surface of the pulley. Specifically, the crown is a shape in which the outer diameter decreases from the center of the outer peripheral surface toward the end side in the rotating shaft direction of the pulley. That is, the outer diameter of the pulley is the largest in the center portion in the rotating shaft direction. The driving reel 6 has an outer peripheral surface 6a and a pair of edge members 6b.

[0047] A crown having a curvature radius R is formed on the outer peripheral surface 6a. That is, the distance from the outer peripheral surface 6a to the rotation axis is greater in the central portion in the rotation axis direction than in the end portions in the rotation axis direction. A pair of edge members 6b are respectively provided at both end portions of the outer peripheral surface 6a in the rotation axis direction. The pair of edge members 6b extend perpendicularly to the rotation axis direction from the outer peripheral surface 6a.

[0048] Although not shown in the figure, on the driving winch 6, the outer peripheral surface 6a and the pair of edge members 6b are arranged corresponding to the number of the plurality of main ropes 8. The plurality of main ropes 8 are respectively wound around any one of the groups of the outer peripheral surface 6a and the pair of edge members 6b. When wound around the driving winch 6, the main ropes 8 come into contact with a portion of the corresponding outer peripheral surface 6a. The pair of edge members 6b guide the main ropes 8 respectively so that the corresponding main ropes 8 do not fall off the outer peripheral surface 6a.

[0049] Although not shown, the deflection wheel 7 as a pulley has an outer peripheral surface and edge members similar to those of the driving winch 6. In addition, the outer peripheral surface of the deflection wheel 7 may not have a crown.

[0050] Next, use Figure 3 and Figure 4 The main rope 8 will be described.

[0051] Figure 3 This is a perspective view of a main portion of a main rope of the rope system in Embodiment 1. Figure 4 This is a diagram showing an AA cross section of a main rope of the rope system in the first embodiment.

[0052] Figure 3 The main rope 8 is a flat belt-shaped rope. When describing the main rope 8, the directions defined by the XYZ axes are used. The XYZ axes are relative to the main rope 8 wound around the Figure 3 The main rope 8 is defined when it is on the driving winch 6 (not shown). The surface of the main rope 8 extending in the width direction is in contact with a part of the outer peripheral surface 6a of the driving winch 6.

[0053] The X direction is in the width direction of the main rope 8. The X direction is parallel to the rotation axis of the drive winch 6 when the main rope 8 is wound around the drive winch 6. The Z direction is in the length direction of the main rope 8. The Y direction is in the thickness direction of the main rope 8. The thickness direction of the main rope 8 is a direction perpendicular to the width direction and the length direction of the main rope 8. That is, the Y direction is a direction perpendicular to the X direction and the Z direction.

[0054] Figure 4 express Figure 3 The AA section of the main rope 8 is shown. The AA section is a section based on the XY plane. In addition, the AA section is a section perpendicular to the length direction of the main rope 8. Any section perpendicular to the length direction of the main rope 8 has the same shape.

[0055] like Figure 4 As shown, in the AA section, the main rope 8 is formed into a rectangular shape. The width dimension, which is the dimension in the width direction of the main rope 8, is greater than the thickness dimension, which is the dimension in the thickness direction. The main rope 8 has a contact surface 8a and a contact opposite surface 8b. Figure 4 Although not shown in the figure, the main rope 8 contacts the driving winch 6 and the deflector 7 as pulleys on the contact surface 8a. The opposite contact surface 8b faces the opposite direction to the contact surface 8a. When no load is applied to the main rope 8, the contact surface 8a and the opposite contact surface 8b are both flat surfaces. The main rope 8 has a covering 20 and a plurality of supporting members 21.

[0056] The covering member 20 forms the outer shape of the main rope 8. That is, in the AA section, the outer shape of the covering member 20 is formed in the same rectangular shape as the main rope 8. For example, the covering member 20 constitutes the entirety of the main rope 8 except for the plurality of supporting members 21. That is, the covering member 20 constitutes the contact surface 8a.

[0057] The material of the coating 20 is a material that satisfies the traction capacity related to the frictional force of the pulley surface required of the main rope 8. The material of the coating 20 is a material that can protect the plurality of support members 21 from loads caused by the external environment and physical loads.

[0058] Here, the load caused by the external environment includes a load caused by heat and a load caused by humidity. The physical load includes a load caused by contact with the drive winch 6 and the deflection sheave 7 as pulleys.

[0059] For example, the material of the covering member 20 can be an olefin-based, styrene-based, vinyl chloride-based, polyurethane-based, polyester-based, polyamide-based, fluorine-based, or butadiene-based thermoplastic elastomer. In addition, as the elastomer material, the material of the covering member 20 can be a thermosetting elastomer, that is, a thermosetting rubber, such as butadiene rubber, styrene-butadiene rubber, chloroprene rubber, acrylic rubber, polyurethane rubber, and silicone rubber.

[0060] A plurality of supporting members 21 are provided inside the covering member 20 along the length direction of the main rope 8. That is, each of the plurality of supporting members 21 is covered by the covering member 20 all around. The plurality of supporting members 21 are arranged along the width direction of the main rope 8. Each of the plurality of supporting members 21 supports the tension acting in the Z direction on the main rope 8. For example, the tension generated by the load for hoisting the car 14 is applied to the main rope 8. In addition, the load supported by the covering member 20 in the load is so small as to be negligible compared with the load supported by the supporting member 21. That is, it can be considered that the tension is supported only by the supporting member 21.

[0061] For example, each of the plurality of support members 21 has the same structure. Specifically, the materials of the plurality of support members 21 are the same. The shapes of the plurality of support members 21 are the same. In the AA cross section, the support member 21 is formed into a flat rectangular shape. The dimension of the support member 21 in the width direction is greater than the dimension of the support member 21 in the thickness direction. In addition, the shapes of the support members 21 are not limited to Figure 4 Shape shown.

[0062] Figure 4The center of gravity position G of the tension in the Z direction generated by the support member 21 in the AA section is represented. The center of gravity position G of the tension is also referred to as the center of gravity position G of the support member 21. The tension in the Z direction of the AA section acting on the main rope 8 can be considered to act on a point in each section of the support members 21a, 21b, 21c, and 21d. The center of gravity position G of the tension is the action position. In each of the plurality of support members 21, when the properties of the material and the like do not change along the length direction of the support member 21, the center of gravity position G of the tension coincides with the position that becomes the center position in the width direction and the center position in the thickness direction of the support member 21. For example, the center of gravity position G of the tension coincides with the position of the center of gravity of the figure representing the outer shape of the support member 21.

[0063] Figure 4 The example in which the number of the plurality of supporting members 21 is 4 is shown. For example, the plurality of supporting members 21 are supporting members 21a, 21b, 21c, and 21d.

[0064] The supporting members 21b and 21c are provided as first supporting members at the center side in the width direction of the plurality of supporting members 21. For example, the supporting members 21b and 21c are provided line-symmetrically in the width direction with respect to the center position in the width direction of the main rope 8. The center of gravity position G of the supporting member 21b and the center of gravity position G of the supporting member 21c as the first center of gravity position are located on the dotted line S indicating the center position in the thickness direction of the main rope 8. That is, the supporting members 21b and 21c are located at the center of the thickness direction of the main rope 8.

[0065] The supporting member 21a is located as a second supporting member on the end side relative to the center in the width direction of the main rope 8, compared with the supporting member 21b as the first supporting member. The supporting member 21a is located at a position farther from the contact surface 8a than the supporting member 21b in the thickness direction of the main rope 8. That is, the distance between the center of gravity position G of the supporting member 21a as the second center of gravity position and the contact surface 8a is greater than the distance between the center of gravity position G of the supporting member 21b as the first center of gravity position and the contact surface 8a. Therefore, the center of gravity position G of the supporting member 21a is located at a position away from the dotted line S by an offset h. h is a value greater than 0. Here, the offset h is also calculated as the difference between the distance from the center of gravity position G of the second supporting member 24a to the contact surface 8a and the distance from the center of gravity position G of the first supporting member 24b to the contact surface 8a.

[0066] The support member 21d is provided as a second support member at a position symmetrical to the central position of the support member 21a in the width direction. That is, the support member 21d is located closer to the end side relative to the center than the support member 21c as the first support member in the width direction of the main rope 8. The support member 21d exists at a position farther from the contact surface 8a than the support member 21c.

[0067] Next, use Figure 5 The structure of the supporting member 21 will be described.

[0068] Figure 5 This is an enlarged view of a cross section of a supporting member of the rope system in the first embodiment.

[0069] Figure 5 A cross section based on a plane perpendicular to the longitudinal direction of the support member 21 is shown. Figure 5 2 shows the material structure of the support member 21. The support member 21 includes a plurality of high-strength fibers 201 and a resin matrix material 202.

[0070] The high-strength fibers 201 are arranged along the longitudinal direction of the support member 21. The plurality of high-strength fibers 201 are bonded to each other via a resin matrix 202.

[0071] The material of the high-strength fiber 201 can be a light-weight and high-strength fiber. For example, the material of the high-strength fiber 201 can be glass fiber, aramid fiber, PBO (poly-p-phenylene benzobisoxazole) fiber or basalt fiber. In addition, the material of the high-strength fiber 201 can also be a composite fiber formed by combining these fibers in any combination.

[0072] For example, the material of the resin matrix 202 can be a thermosetting resin such as polyurethane, epoxy resin, unsaturated polyester, vinyl ester, phenol, silicone, etc. In addition, as an impregnating resin for bonding the plurality of high-strength fibers 201, the resin matrix 202 can be a thermoplastic resin such as polyethylene, polypropylene, polyamide 6 (PA6), polyamide 12 (PA12), polyamide 66 (PA66), polycarbonate, polyetheretherketone, polyphenylene sulfide, etc.

[0073] In addition, the supporting member 21 may further contain a filler for improving moldability, an adhesive for improving adhesion between the high-strength fiber 201 and the resin matrix 202, and the like.

[0074] In addition, the supporting member 21 may not be a composite material of the high-strength fiber 201 and the resin matrix 202 but may be a steel wire or the like.

[0075] Next, use Figure 6 and Figure 7 The main rope 8 wound around the pulley will be described.

[0076] Figure 6 and Figure 7 This is a cross-sectional view of a main portion of the rope system in the first embodiment.

[0077] Figure 6 This is a cross-sectional view based on a plane including the rotation axis of the drive winch 6. The cross section of the main rope 8 based on this plane is the same as the cross section of the main rope 8 based on the XY plane. Figure 6 The main rope 8 is schematically shown before being wound onto the drive winch 6 .

[0078] The dashed line C indicates the center position of the drive capstan 6 in the X direction. The main rope 8 is wound around the drive capstan 6 such that the center position of the main rope 8 in the X direction coincides with the center position of the drive capstan 6 in the X direction.

[0079] The change of crown h s is the difference between the Y-direction position of the outer surface 6a corresponding to the first center of gravity position G of the support member 21c and the Y-direction position of the outer surface 6a corresponding to the second center of gravity position G of the support member 21d. In addition, the Y-direction position of the outer surface 6a is determined by the distance from the rotation axis. Therefore, the change h s The change h is obtained as the difference between a first distance from the portion of the outer peripheral surface 6a corresponding to the first center of gravity position G to the rotation axis and a second distance from the portion of the outer peripheral surface 6a corresponding to the second center of gravity position G to the rotation axis. s This corresponds to the amount of relative movement of the support member 21d relative to the support member 21c in the Y direction when the main rope 8 is wound around the outer peripheral surface 6a. For example, the offset h is set to be equal to the change h s In addition, if the offset h is greater than 0, the offset h can also be less than the change h. s The value of .

[0080] Figure 7 This is a cross section of the main rope 8 and the driving winch 6 in a state where the main rope 8 is wound around the driving winch 6. This cross section is formed by a plane including the rotation axis of the driving winch 6.

[0081] When the main rope 8 is wound on the driving winch 6, it is bent along the outer peripheral surface 6a formed with the crown. At this time, the portion of the main rope 8 that is located closer to the end side than the central position in the X direction of the driving winch 6 is shorter in distance from the rotation axis. On the other hand, the center of gravity positions G of the plurality of supporting members 21 exist on the same straight line. The straight line passing through the center of gravity positions G of the plurality of supporting members 21 is parallel to the rotation axis of the driving winch 6. That is, the distance between the center of gravity position G of the supporting member 21 and the rotation axis, i.e., the rotation diameter, is equal in any one of the supporting members 21.

[0082] In the main rope 8 of the present embodiment, since the center of gravity positions G of the plurality of support members 21 exist at positions equidistant from the rotation axis, the tensions generated in the plurality of support members 21 are substantially the same in magnitude.

[0083] Moreover, when the main rope 8 is wound around the deflector sheave 7 instead of the driving winch 6, the same state is achieved.

[0084] Next, use Figure 8 A comparative example to be compared with the main rope 8 of the present embodiment will be described.

[0085] Figure 8 This is a cross-sectional view of a main part of a comparative example that is different from the rope system in the first embodiment.

[0086] Figure 8 The main rope 8-1 having the offset h of 0 is shown. That is, in a state where no load is applied to the main rope 8-1, the center of gravity positions of the plurality of support members 21-1 are all located on the same straight line.

[0087] When the main rope 8 - 1 is wound around the driving winch 6 , the positions of the centers of gravity of the plurality of support members 21 - 1 are located at different positions in the Y direction, and therefore are not on the same straight line.

[0088] In this case, the tension in the longitudinal direction generated by the supporting members 21-1b and 21-1c is greater than the tension generated by the supporting members 21-1a and 21-1d. In this case, the supporting members 21-b and 21-1c are more likely to be damaged than when tension is applied evenly to the supporting members, that is, when a plurality of supporting members each bear a load evenly. In addition, the surface pressure between the supporting member 21-1b and the outer peripheral surface 6a is greater than the surface pressure between the supporting member 21-1a and the outer peripheral surface 6a. Therefore, the contact surface 8-1a may be partially worn. As a result, the main rope 8-1 needs to be replaced earlier than the main rope 8 of the present embodiment.

[0089] According to the above-described embodiment 1, the rope system 5 includes a driving winch 6 or a deflector pulley 7 as a pulley and a main rope 8 as a rope. A crown is formed on the pulley. Therefore, bending of the rope is suppressed. The main rope 8 includes a plurality of supporting members 21 and a covering member 20. In the main rope 8, the distance from the second center of gravity position of the supporting member 21a as the second supporting member to the contact surface 8a is greater than the distance from the first center of gravity position of the supporting member 21b as the first supporting member to the contact surface 8a. Therefore, the deviation of the tension applied to the plurality of supporting members 21 in the longitudinal direction can be suppressed. The uneven distribution of the surface pressure between the contact surface 8a and the outer peripheral surface 6a can be suppressed. As a result, the life of the main rope 8 can be extended, and the reliability of the rope system 5 can be improved. In addition, the replacement frequency of the main rope 8 can be reduced, and the life cycle cost can be reduced.

[0090] Moreover, such a main rope 8 can be manufactured only by changing the configuration of the plurality of supporting members 21, compared to the existing main rope. At this time, there is no need for high manufacturing technology, such as high-precision control of the shape of the covering member 20. In the case of forming the shape of the covering member 20 into a non-rectangular shape, it is necessary to make a forming mold corresponding to the crown formed on the pulley, or to process the main rope 8 into a shape corresponding to the crown after forming it into a rectangle. On the other hand, when manufacturing the main rope 8 of the present embodiment, only an easy change such as changing the configuration of the plurality of supporting members 21 is implemented. Therefore, the main rope 8 can be easily manufactured. In addition, since such a main rope 8 is manufactured, the increase in manufacturing cost can be suppressed.

[0091] In addition, the offset amount h in the thickness direction of the plurality of support members 21 is determined according to the height variation h of the crown of the driving winch 6. s Specifically, the distance h is set to the change h s Therefore, it is possible to suppress the deviation of the tension applied to the plurality of support members 21. Specifically, the following results are obtained by analyzing the finite element method: s When the tension values ​​generated in the plurality of support members 21 are similar, the deviation in the tension values ​​is about 1 / 10 of that when the offset h is 0. Here, the deviation in the tension values ​​is the difference between the minimum value and the maximum value of each tension generated in the plurality of support members 21 .

[0092] In addition, it is sufficient that at least one set of the first supporting member and the second supporting member is included in the plurality of supporting members 21. For example, if the supporting member 21b and the supporting member 21a as the set of the first supporting member and the second supporting member are arranged at different positions in the Y direction, the supporting member 21c and the supporting member 21d do not need to be arranged at different positions in the Y direction.

[0093] In addition, the number of the plurality of supporting members 21 may be any number as long as it is 2 or more. For example, the number of the plurality of supporting members 21 may be 3, 6, or 8. The greater the number of supporting members 21, the greater the number of configuration patterns of the supporting members 21 in the Y direction. Therefore, the greater the number of supporting members 21, the more the plurality of supporting members 21 can be configured in a manner that the tension applied to each of the plurality of supporting members 21 is more even. In addition, the plurality of supporting members 21 may not be symmetrically configured with respect to the center position of the main rope 8 in the X direction.

[0094] Implementation Method 2

[0095] Fig. 9 2 is a cross-sectional view of a main rope of a rope system in Embodiment 2. In addition, the same reference numerals are attached to the same or corresponding parts as those in Embodiment 1. The description of such parts will be omitted.

[0096] The main rope 8 in the second embodiment is formed so that the spring constant in the width direction is different between the center side and the end side. Here, the spring constant is a constant that indicates the ease of deformation of the member relative to the force applied to the member. The spring constant is a proportional constant in the proportional relationship between the magnitude of the force applied to the member and the deformation amount of the member when the member is elastically deformed. For example, the spring constant is calculated by (elastic modulus of the member in the load direction of the load) × (cross-sectional area on the plane perpendicular to the load direction) / length of the load applied in the load direction).

[0097] Fig. 9 The figure shows a cross section of the main rope 8 of Embodiment 2 cut through a plane perpendicular to the length direction. The main rope 8 is divided into two first parts P1 and two second parts P2. The first part P1 and the second part P2 are parts of the main rope 8 formed by dividing the width direction of the main rope 8 along the thickness direction. The first part P1 is located on the central side in the width direction. The second part P2 is located on the side closer to the end than the first part P1 in the width direction. In the present embodiment, the two first parts P1 are symmetrically arranged with the central position in the width direction of the main rope 8 as the center. The two second parts P2 are symmetrically arranged with the central position in the width direction of the main rope 8 as the center. In addition, the second part P2 may not be located on the end side of the first part P1 in the width direction. Fig. 9 The portion shown.

[0098] In Embodiment 2, the main rope 8 is different from Embodiment 1 and includes a plurality of supporting members 22. The plurality of supporting members 22 are arranged in the width direction. In an unloaded state where no load is applied to the main rope 8, the center of gravity positions of the plurality of supporting members 22 all exist on the same straight line. The plurality of supporting members 22 include first supporting members 22b, 22c and second supporting members 22a, 22d.

[0099] The first supporting members 22b, 22c and the second supporting members 22a, 22d are formed of the same material. Although not shown in detail, the content of the high-strength fiber 201 of the first supporting members 22b, 22c and the second supporting members 22a, 22d is all equal except for the manufacturing deviation. The resin matrix 202 of the first supporting members 22b, 22c and the second supporting members 22a, 22d is the same. Therefore, the elastic modulus per unit volume of the first supporting members 22b, 22c and the second supporting members 22a, 22d is equal.

[0100] The first supporting members 22b and 22c are respectively located in the first portion P1. The first supporting members 22b and 22c have a thickness dimension h2.

[0101] The second supporting members 22a and 22d are respectively located in the second portion P2. The thickness direction dimensions of the second supporting members 22a and 22d are h1. h1 is greater than h2. The width direction dimensions of the second supporting members 22a and 22d are the same as the width direction dimensions of the first supporting members 22b and 22c.

[0102] The length spring constant k which is the spring constant in the length direction of the main rope 8 L It can be calculated using the following formula (1) based on the material mechanics relationship.

[0103] [Mathematical formula 1]

[0104]

[0105] In the formula (1), E is the elastic modulus in the longitudinal direction of the support member 22. A is the cross-sectional area of ​​the cross section perpendicular to the longitudinal direction of the support member 22. L is the area of ​​the main rope 8 wound around Fig. 9 The length on the driving winch 6 not shown in the figure.

[0106] The cross-sectional area A1 of the first support members 22b, 22c is smaller than the cross-sectional area A2 of the second support members 22a, 22d. Therefore, the first length spring constant k of the first support members 22b, 22c is L is smaller than the second length spring constant k of the second support members 22a, 22d L .

[0107] That is, in the main rope 8 of the second embodiment, the first length spring constant k of the first portion P1 is L The second length spring constant k is smaller than the second portion P2 L .

[0108] When the main rope 8 is wound around the driving winch 6, the circumference of the driving winch 6 corresponding to the position of the first portion P1 is larger than the circumference of the driving winch 6 corresponding to the position of the second portion P2. That is, when the main rope 8 is wound around the driving winch 6, the elastic deformation amount of the first portion P1 is larger than the elastic deformation amount of the second portion P2. On the other hand, due to the first length spring constant k of the first portion P1 L The second length spring constant k of the second portion P2 is L Since the first part P1 is smaller than the second part P2, the first part P1 is more easily elastically deformed than the second part P2. Therefore, when the first part P1 and the second part P2 are elastically deformed, the difference between the tension generated in the first part P1 and the tension generated in the second part P2 becomes smaller. That is, the deviation of the tension in the first part P1 and the second part P2 is suppressed.

[0109] According to the second embodiment described above, the rope system 5 includes a pulley formed with a crown and a main rope 8 as a rope. A crown is formed on the pulley. Therefore, bending of the rope is suppressed. The main rope 8 is divided into a first part P1 and a second part P2 arranged in the width direction. The spring constant of the first part P1 is smaller than the spring constant of the second part P2. Therefore, when a load is applied to the main rope 8 in a state wound on the pulley, the first part P1 is elongated more than the second part P2. The deviation between the tension generated in the first part P1 and the tension generated in the second part P2 can be suppressed. In addition, the deviation between the surface pressure between the first part P1 and the outer peripheral surface 6a and the surface pressure between the second part P2 and the outer peripheral surface 6a can be suppressed. As a result, the life of the main rope 8 can be extended.

[0110] Moreover, such a main rope 8 can be manufactured by only changing the cross-sectional dimensions of the plurality of supporting members 22 with respect to the conventional main rope. Therefore, the main rope 8 can be manufactured easily.

[0111] In addition, the main rope 8 has a first supporting member 22b, a second supporting member 22a, and a covering member 20. The spring constant of the first portion P1 is the first length spring constant of the first supporting member 22b. The spring constant of the second portion P2 is the second length spring constant of the second supporting member 22a. The first length spring constant is smaller than the second length spring constant. Therefore, the life of the main rope 8 can be extended.

[0112] In addition, the number of the plurality of support members 22 is not limited to the number described in the second embodiment as long as it is two or more.

[0113] In addition, the cross-sectional shape of the plurality of support members 22 is not limited to the shape described in Embodiment 2 as long as the length spring constant can be adjusted. For example, the length in the width direction of the support member 22 may be changed. In this case, the surface pressure between the support member 22 and the outer peripheral surface 6a can be equalized.

[0114] Next, use Fig.10 and Fig.11 A variation of the second embodiment will be described.

[0115] Fig.10 and Fig.11 This is a cross-sectional view of the main rope of the rope system in the second embodiment.

[0116] Fig.10 2 shows a cross section of a main rope 8 according to a modification of Embodiment 2 cut along a plane perpendicular to the longitudinal direction. In the modification, the main rope 8 does not include a plurality of supporting members 22 but includes a plurality of supporting members 23. Fig. 9 The same as embodiment 2 shown.

[0117] The plurality of supporting members 23 include first supporting members 23b, 23c and second supporting members 23a, 23d. The first supporting members 23b, 23c are located at the two first portions P1, respectively. The second supporting members 23a, 23d are located at the two second portions P2, respectively. In the unloaded state, the plurality of supporting members 23a, 23b, 23c, 23d are all located on the same straight line.

[0118] The shapes of the first supporting members 23b and 23c are the same as those of the second supporting members 23a and 23d. Fig.10 The content of the high-strength fiber 201 (not shown) is higher than the content of the high-strength fiber 201 of the first supporting members 23b and 23c. Therefore, the elastic modulus E of the second supporting members 23a and 23d in the longitudinal direction is higher than the elastic modulus E of the first supporting members 23b and 23c in the longitudinal direction. As a result, according to formula (1), the length spring constant k of the first supporting members 23b and 23c is L smaller than the length spring constant k of the second support members 23a, 23d L .

[0119] Fig.11 Represents distance w1 and distance w2. Distance w1 is the distance from the central position in the width direction of the main rope 8 to location 1 which is the center of gravity position of the first part P1. For example, the center of gravity position of the first part P1 is the center of gravity position of the first supporting member 23c. Distance w2 is the distance from the central position in the width direction of the main rope 8 to location 2 which is the center of gravity position of the second part P2. For example, the center of gravity position of the second part P2 is the center of gravity position of the second supporting member 23d. In this case, the elastic modulus in the length direction of the first supporting member 23c and the elastic modulus in the length direction of the second supporting member 23d are preferably set to satisfy the following formula (2).

[0120] [Mathematical formula 2]

[0121]

[0122] (2) In the formula, k L1 k is the length spring constant of the main rope 8 per unit length in the width direction of the point 1. L2 It is the length spring constant of the main rope 8 per unit length in the width direction at point 2. Although not shown in the figure, L1 is the distance that the portion at point 1 of the outer peripheral surface 6a rotates and moves when the main rope 8 is wound on the drive winch 6 and rotates, that is, the circumference of point 1. Here, the portion at point 1 of the outer peripheral surface 6a is the portion in contact with the first portion P1 of the outer peripheral surface 6a. L2 is the distance that the portion at point 2 of the outer peripheral surface 6a rotates and moves when the main rope 8 is wound on the drive winch 6 and rotates, that is, the circumference of point 2. Here, the portion at point 2 of the outer peripheral surface 6a is the portion in contact with the second portion P2 of the outer peripheral surface 6a.

[0123] Formula (2) is a condition that the value of the tension in the longitudinal direction of the main rope 8 at location 2 is less than 5 times the value of the tension in the longitudinal direction of the main rope 8 at location 1. Moreover, it is most preferred that the elastic modulus in the longitudinal direction of the first supporting member 23c and the elastic modulus in the longitudinal direction of the second supporting member 23d are set to satisfy the following formula (3).

[0124] [Mathematical formula 3]

[0125]

[0126] The formula (3) is a condition that the value of the tension applied to the main rope 8 in the longitudinal direction at the point 2 is equal to the value of the tension applied to the main rope 8 in the longitudinal direction at the point 1.

[0127] In addition, the elastic modulus of the first supporting member 23b and the elastic modulus of the second supporting member 23a are also set to be the same.

[0128] According to the modification of the second embodiment described above, a plurality of supporting members 23 are provided on the main rope 8 instead of the plurality of supporting members 22. The length spring constant is adjusted by changing the material of each of the plurality of supporting members 23. Therefore, the main rope 8 can be easily manufactured.

[0129] The spring constants of the first portion P1 and the second portion P2 are set so that the maximum value of the tension applied to the first portion P1 in the longitudinal direction is 5 times or less of the minimum value of the tension applied to the second portion P2 in the longitudinal direction.

[0130] Furthermore, if the elastic modulus in the longitudinal direction is changed, not only the content of the high-strength fiber 201 but also other factors such as the raw material of the high-strength fiber 201 and the raw material of the resin matrix 202 can be changed.

[0131] In addition, in the main rope 8, the elastic modulus is adjusted so as to satisfy the formula (2). Therefore, the life of the main rope 8 can be extended.

[0132] Implementation 3

[0133] Fig.12 This is a cross-sectional view of the main rope of the rope system in the third embodiment. Fig.13 1 is a cross-sectional view of a main rope and a driving winch of a rope system in Embodiment 3. In addition, the same reference numerals are attached to the same or corresponding parts as those in Embodiment 1 or Embodiment 2. The description of such parts is omitted.

[0134] The main rope 8 in the third embodiment includes a plurality of supporting members 24, first compression members 30b, 30c, and second compression members 30a, 30d. In addition, the first compression members 30b, 30c, and second compression members 30a, 30d, like the covering member 20, hardly support the load generated in the longitudinal direction of the main rope 8. Therefore, in the third embodiment, it can be considered that the tension caused by the load is supported only by the plurality of supporting members 24.

[0135] The materials of the plurality of support members 24 are all the same. When the main rope 8 is in an unloaded state, the shapes of the plurality of support members 24 are all the same. When the main rope 8 is in an unloaded state, the center of gravity positions of the plurality of support members 24 are all on the same straight line in the cross section.

[0136] The first compression members 30b and 30c are respectively included in the two first parts P1. The first compression members 30b and 30c are provided along the length direction of the main rope 8. The first compression members 30b and 30c are in contact with the surfaces of the first supporting members 24b and 24c on the contact surface 8a side. The first compression members 30b and 30c together with the contact surface 8a constitute the outer shape of the main rope 8.

[0137] The second compression members 30a and 30d are respectively included in the two second parts P2. The second compression members 30a and 30d are arranged along the length direction of the main rope 8. The second compression members 30a and 30d are in contact with the surfaces of the second supporting members 24a and 24d on the contact surface 8a side. The second compression members 30a and 30d together with the contact surface 8a constitute the outer shape of the main rope 8.

[0138] In any horizontal cross section in the length direction of the main rope 8, the shape of the first compression member 30b, 30c is the same as the shape of the second compression member 30a, 30d. The elastic modulus of the first compression member 30b, 30c in the thickness direction is smaller than the elastic modulus of the second compression member 30a, 30d in the thickness direction. Therefore, with respect to the spring constant in the thickness direction, i.e., the thickness spring constant, the first thickness spring constant of the first compression member 30b, 30c is smaller than the second thickness spring constant of the second compression member 30a, 30d. As a result, the spring constant of the first portion P1 is smaller than the spring constant of the second portion P2.

[0139] The first thickness spring constant of the first compression member 30b is obtained by (elastic modulus in the thickness direction of the first compression member 30b)×(cross-sectional area of ​​the first compression member 30b on a plane perpendicular to the thickness direction) / (length in the thickness direction of the first compression member 30b). The first thickness spring constant of the first compression member 30c is obtained similarly.

[0140] The second thickness spring constant of the second compression member 30a is obtained by (elastic modulus in the thickness direction of the second compression member 30a)×(cross-sectional area of ​​the second compression member 30a on a plane perpendicular to the thickness direction) / (length in the thickness direction of the second compression member 30a). The second thickness spring constant of the second compression member 30d is also obtained in the same manner.

[0141] Fig.13 Implementation 2 Fig.11 Similarly, the distance w1 and the distance w2 are represented. The distance w1 is the distance from the central position in the width direction of the main rope 8 to the location 1 which is the center of gravity position of the first supporting member 24c. For example, the center of gravity position of the first part P1 is the center of gravity position of the first supporting member 24c. The distance w2 is the distance from the central position in the width direction of the main rope 8 to the location 2 which is the center of gravity position of the second part P2. For example, the center of gravity position of the second part P2 is the center of gravity position of the second supporting member 24d. In this case, it is preferable to set the elastic modulus in the thickness direction of the first compression member 30c and the elastic modulus in the thickness direction of the second compression member 30d to satisfy the following formula (4).

[0142] [Formula 4]

[0143]

[0144] (4) In the formula, h s is the change in the crown corresponding to point 1 and point 2. T is the total tension acting on the main rope 8. W is the sum of the width dimensions of the plurality of support members 24. T1k is the first thickness spring constant of the first compression member 30c per unit length in the width direction of the location 1. T2 It is the second thickness spring constant which the second compression member 30d has per unit length in the width direction of the point 2.

[0145] Next, use Fig.14 The state in which the main rope 8 is wound around the driving winch 6 will be described.

[0146] Fig.14 This is a cross-sectional view of a main portion of the rope system in the third embodiment.

[0147] Fig.14 This is a cross section of the main rope 8 and the drive winch 6 in a state where the main rope 8 is wound around the drive winch 6. This cross section is formed by a plane including the rotation axis of the drive winch 6. In this state, the first compression members 30b, 30c and the second compression members 30a, 30d are in contact with the outer peripheral surface 6a. That is, the first compression members 30b, 30c are respectively located between the first support members 24b, 24c and the outer peripheral surface 6a. The second compression members 30a, 30d are respectively located between the second support members 24a, 24d and the outer peripheral surface 6a.

[0148] When tension is generated in the main sheave 8 in a state of being wound around the driving sheave 6 , the plurality of support members 24 apply loads in the direction of the rotation axis of the driving sheave 6 to the adjacent compression members.

[0149] The first compression members 30b, 30c and the second compression members 30a, 30d are compressed by the load and shrink in the thickness direction. At this time, due to the different thickness spring constants, the amount of shrinkage of the first compression members 30b, 30c is greater than the amount of shrinkage of the second compression members 30a, 30d. That is, the amount of movement of the first support members 24b, 24c toward the rotation axis is greater than the amount of movement of the second support members 24a, 24d toward the rotation axis. As a result, the center of gravity positions G of the multiple support members 24 exist on the same straight line. The straight line passing through the center of gravity positions G of the multiple support members 24 is parallel to the rotation axis of the drive winch 6.

[0150] In this case, similarly to the first embodiment, the tensions generated in the plurality of support members 24 have substantially the same magnitude.

[0151] According to the third embodiment described above, the main rope 8 includes a plurality of supporting members 24, a covering member 20, first compression members 30b, 30c, and second compression members 30a, 30d. The spring constant of the first portion P1 is the first thickness spring constant of the first compression member 30b. The spring constant of the second portion P2 is the second thickness spring constant of the second compression member 30a. The first thickness spring constant is smaller than the second thickness spring constant. Therefore, as in the first embodiment, the deviation of the tension generated in the plurality of supporting members 24 can be suppressed. As a result, the life of the main rope 8 can be extended. At this time, the main rope 8 is formed as a whole into a rectangular shape. Therefore, the main rope 8 can be easily manufactured.

[0152] In addition, the first thickness spring constant and the second thickness spring constant are set to satisfy the relationship of formula (4). Therefore, the tension generated in the width direction of the main rope 8 becomes more uniform. As a result, the life of the main rope 8 can be extended.

[0153] In addition, the first compression members 30b, 30c and the second compression members 30a, 30d only need to be located at least between the corresponding support member 24 and the outer peripheral surface 6a when the main rope 8 is wound around the drive winch 6. Therefore, several variations can be envisioned in the arrangement of the first compression members 30b, 30c and the second compression members 30a, 30d.

[0154] Fig.15 This is a cross-sectional view of a first modified example of the main rope of the rope system in the third embodiment.

[0155] exist Fig.15 In the first modification shown, the first compression members 30b, 30c and the second compression members 30a, 30d are respectively provided on both sides of the corresponding support member 24. That is, the first compression members 30b, 30c and the second compression members 30a, 30d are also provided on the contact opposite surface 8b side.

[0156] Therefore, although not shown in the figure, when the operator winds the main rope 8 around the driving winch 6, the operator can do the work without distinguishing between the front and back sides of the main rope 8. Therefore, the workability is improved. In addition, since the front and back sides of the main rope 8 are not wound by mistake, the reliability of the system can be improved. In addition, after the main rope 8 contacts a pulley at the contact surface 8a, when the opposite contact surface 8b contacts another pulley, the deviation of the tension generated on the main rope 8 can be suppressed in any pulley.

[0157] Fig.16 This is a cross-sectional view of a second modified example of the main rope of the rope system in the third embodiment.

[0158] exist Fig.16In the second modified example shown, the first compression members 30b, 30c and the second compression members 30a, 30d are respectively covered by the covering member 20. That is, although not shown, for example, when the main rope 8 is wound around the driving winch 6, the second compression member 30a and the covering member 20 exist between the second supporting member 24a and the outer peripheral surface 6a.

[0159] Therefore, the traction force between the main rope 8 and the driving winch 6 can be stabilized. Fig.14 As shown, when the compression member is in contact with the outer peripheral surface 6a, the deformation amount of the compression member can be easily predicted compared with the second modification example, so the thickness spring constant can be easily adjusted.

[0160] Fig.17 This is a cross-sectional view of a third modified example of the main rope of the rope system in the third embodiment.

[0161] exist Fig.17 In the third modified example shown, the first compression members 30b and 30c are not provided on the main rope 8. The thickness spring constants of the second compression members 30a and 30d are both set to a value larger than the thickness spring constant of the coating material 20.

[0162] Although not shown, when the main rope 8 is wound around the driving winch 6, the covering member 20 between each of the first supporting members 24b, 24c and the outer peripheral surface 6a has the same Fig.14 The first compression members 30b and 30c shown in the figure have the same function.

[0163] In the third modification, the main rope 8 may be provided with the first compression members 30b and 30c but without the second compression members 30a and 30d. In this case, the thickness spring constants of the first compression members 30b and 30c are set to be smaller than the thickness spring constant of the covering member 20.

[0164] In addition, the main rope 8 may be composed of any combination of Embodiments 1 to 3. For example, the main rope 8 may be a rope having a plurality of compression members, a plurality of support members having different distances from the contact surface 8a in the unloaded state, a plurality of support members having different spring constants in the longitudinal direction.

[0165] In addition, the rope system 5 may be applied to other devices using pulleys and belt ropes instead of elevator devices. For example, the rope system 5 may be applied to a crane. In this case, the ropes of the rope system 5 may be ropes used for the crane. In addition, the pulley of the rope system 5 may be other pulleys, belt wheels, etc. instead of the drive winch 6 or the deflector pulley 7.

[0166] Industrial Applicability

[0167] As described above, the rope system of the present disclosure can be utilized in an elevator device.

[0168] Description of Reference Numerals

[0169] 1 elevator device, 2 hoistway, 3 building, 4 machine room, 5 rope system, 6 driving winch, 6a outer peripheral surface, 6b edge member, 7 deflection wheel, 8, 8-1 main rope, 8a, 8-1a contact surface, 8b opposite contact surface, 9 winch, 10 motor, 11 brake, 12 car guide rail, 13 counterweight guide rail, 14 car, 14a car frame, 14b car room, 15 one side holding system, 16 counterweight, 17 other side holding system, 18 control panel, 20 cover, 21, 21a, 21b, 21c, 21d, 21-1, 21- 1a, 21-1b, 21-1c, 21-1d supporting member, 22 supporting member, 22a, 22d second supporting member, 22b, 22c first supporting member, 23 supporting member, 23a, 23d second supporting member, 23b, 23c first supporting member, 24 supporting member, 24a, 24d second supporting member, 24b, 24c first supporting member, 30a, 30d second compression member, 30b, 30c first compression member, 201 high-strength fiber, 202 resin matrix, G center of gravity position, P1 first part, P2 second part.

Claims

1. A rope system, characterized in that: The rope system comprises: a pulley which is rotatably provided and has a crown portion whose outer diameter decreases from the center toward the end side in the direction of the rotation axis; and The rope has a rectangular cross section perpendicular to the length direction and is wound around the pulley with the width direction facing the rotation axis. The rope has: a plurality of supporting members, respectively provided along the length direction of the rope and arranged in the width direction; and a covering member covering the plurality of supporting members in the longitudinal direction of the rope, having a contact surface, and contacting the pulley at the contact surface, The plurality of support members include a first support member and a second support member, The first supporting member is located closer to the center in the width direction than the second supporting member in the width direction. In the cross section, a distance from a second center of gravity of tension acting in the longitudinal direction of the second supporting member to the contact surface is greater than a distance from a first center of gravity of tension acting in the longitudinal direction of the first supporting member to the contact surface.

2. The rope system according to claim 1, characterized in that: When the rope is wound around the pulley, the multiple supporting members are configured relative to the difference between the first distance and the second distance, i.e., the crown variation, so that the difference between the distance from the second center of gravity position to the contact surface and the distance from the first center of gravity position to the contact surface is less than the crown variation, the first distance being the distance from a portion of the surface of the pulley that exists between the first supporting member and the rotation axis of the pulley to the rotation axis, and the second distance being the distance from a portion of the surface of the pulley that exists between the second supporting member and the rotation axis to the rotation axis.

3. A rope system, characterized in that: The rope system comprises: a pulley which is rotatably provided and has a crown portion whose outer diameter decreases from the center toward the end side in the direction of the rotation axis; and The rope has a rectangular cross section perpendicular to the length direction and is wound around the pulley with the width direction facing the rotation axis. The rope includes a first portion and a second portion at different positions in the width direction. The first portion is located closer to the center in the width direction than the second portion in the width direction. The first portion has a spring constant that is smaller than a spring constant of the second portion.

4. The rope system according to claim 3, characterized in that: The spring constant of the first portion and the spring constant of the second portion are values ​​obtained by dividing the product of the elastic modulus in the load direction to which the load is applied and the cross-sectional area on a plane perpendicular to the load direction by the length of the rope in the load direction.

5. The rope system according to claim 3 or 4, characterized in that: The spring constant of the first part and the spring constant of the second part are set so that, when the rope to which a load is applied is wound around the pulley and moved, the maximum value of the tension applied to the first part in the length direction is less than 5 times the minimum value of the tension applied to the second part in the length direction.

6. The rope system according to any one of claims 3 to 5, characterized in that: The rope has: a plurality of supporting members, respectively provided along the length direction of the rope and arranged in the width direction; and a covering member covering the plurality of supporting members in the longitudinal direction of the rope, having a contact surface, and contacting the pulley at the contact surface, The plurality of support members include: a first support member included in the first portion; and a second supporting member, included in said second portion, The spring constant of the first portion is a value obtained by dividing the product of the elastic modulus in the longitudinal direction of the first supporting member and the cross-sectional area of ​​the cross section of the first supporting member by the length of the portion of the rope wound around the pulley, that is, a first length spring constant. The spring constant of the second portion is a value obtained by dividing the product of the elastic modulus in the longitudinal direction of the second supporting member and the cross-sectional area of ​​the cross section of the second supporting member by the length of the portion of the rope wound around the pulley, that is, a second length spring constant. The first length spring constant is smaller than the second length spring constant.

7. The rope system according to claim 6, characterized in that The first length spring constant is k L1 , the second length spring constant is k L2 , When the rope is wound around the pulley in such a manner that the rope coincides with the center position of the pulley in the width direction, the distance from the portion of the pulley surface that contacts the first portion to the rotation axis of the pulley is L1, and the distance from the portion of the pulley surface that contacts the second portion to the rotation axis is L2. k L1 , k L2 , L1 and L2 satisfy the following relationship (1), [Mathematical formula 1] 8. The rope system according to claim 3, characterized in that: The rope has: A plurality of supporting members are respectively arranged along the length direction of the rope and arranged in the width direction; a covering member covering the plurality of supporting members over the length direction of the rope, having a contact surface, and contacting the pulley at the contact surface; and A plurality of compression members are respectively arranged along the length direction of the rope and are respectively adjacent to the surfaces of the plurality of support members facing the contact surface. The plurality of support members include: a first support member included in the first portion; and a second supporting member, included in said second portion, The plurality of compression members include: a first compression member included in the first portion and adjacent to the first support member; and a second compression member included in the second portion and adjacent to the second support member, The spring constant of the first portion is a value obtained by dividing the elastic modulus along the thickness direction from the plurality of support members to the contact surface, that is, the product of the elastic modulus in the thickness direction of the first support member and the cross-sectional area of ​​the first compression member on a surface perpendicular to the thickness direction by the length of the first compression member in the thickness direction, that is, the first thickness spring constant. The spring constant of the second portion is a value obtained by dividing the product of the elastic modulus of the second supporting member in the thickness direction and the cross-sectional area of ​​the second compression member on a surface perpendicular to the thickness direction by the length of the second compression member in the thickness direction, that is, a second thickness spring constant. The first thickness spring constant is smaller than the second thickness spring constant.

9. The rope system according to claim 8, characterized in that The first thickness spring constant is k T1 , the second thickness spring constant is k T2 , The tension acting on the entire length direction of the rope is T, the sum of the lengths of the plurality of supporting members in the width direction is W, When the rope is wound around the pulley in such a manner that the rope coincides with the center position of the pulley in the width direction, the crown change amount obtained by subtracting the second distance from the first distance is h s In the case of k T1 , k T2 , T, W and h s The following relationship (2) is satisfied: [Mathematical formula 2] The first distance is a distance from a portion of the surface of the pulley in contact with the first portion to a rotation axis of the pulley, and the second distance is a distance from a portion of the surface of the pulley in contact with the second portion to the rotation axis.

10. The rope system according to any one of claims 1 to 9, characterized in that: The ropes are the main ropes of the elevator.

11. The rope system according to claim 10, characterized in that The pulley is a winch around which the main rope is wound.

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