Elevator hoisting machine and elevator

Abstract

An elevator hoisting machine includes a main body, a rotating member rotatably supported in the main body, and a sheave integrally rotatable with the rotating member. The rotating member includes a sheave-embedded portion in which the sheave is embedded, a cylindrical rotor portion extending from the sheave-embedded portion toward the main body, and a brake-acting portion disposed at an outer circumferential side of the rotor portion. The main body includes a base portion fixed to a mounting surface, a frame portion extending upward or downward from the base portion, a cylindrical portion protruding from the frame portion toward a horizontal direction to rotatably support the sheave-embedded portion, and a pair of ribs extending in an up-down direction within the cylindrical portion and disposed to be separated from each other as approaching the base portion.

Description

Technical Field

[0001] This application relates to the hoisting device of an elevator and the elevator itself. Background Technology

[0002] Patent Document 1 disclosed an elevator in which the shaft for rotating the rope wheel is integrally formed with the main body in order to reduce the thinness of the hoisting device.

[0003] The pulley is cantilevered and supported by a shaft. Therefore, when the load applied to the pulley increases, the displacement of the shaft increases, and the tilt angle of the brake disc, which rotates integrally with the pulley, also increases. Since the brake disc is adjusted to have a very small gap with the brake pads, there is a possibility of friction between the brake disc and the pads when the tilt angle is large.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2019-172394 Summary of the Invention

[0005] Therefore, the objective of this invention is to provide a hoisting device for an elevator and an elevator that can reduce the inclination of the braking part that rotates integrally with the sheave.

[0006] The elevator hoisting device includes: the main body;

[0007] A rotating component, rotatably supported on the main body; and

[0008] The pulley rotates integrally with the rotating component;

[0009] The rotating component includes:

[0010] A rope sheave insertion part, in which the rope sheave is embedded;

[0011] A cylindrical rotor portion extends from the sheave insertion portion toward the main body side; and

[0012] A braking actuation part is disposed on the outer peripheral side of the rotor part;

[0013] The subject includes:

[0014] The base portion is fixed to the mounting surface;

[0015] The frame portion extends upward or downward from the base portion;

[0016] A cylindrical portion, protruding horizontally from the frame portion, rotatably supports the sheave insertion portion; and

[0017] A pair of ribs, extending vertically within the cylindrical portion, are configured to separate from each other as they approach the base portion.

[0018] Additionally, the elevator includes the elevator's hoisting mechanism. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an elevator according to one embodiment.

[0020] Figure 2 This is a front view of the hoisting device of the same embodiment.

[0021] Figure 3 This is a side view of the hoisting device according to the same embodiment.

[0022] Figure 4 It is along Figure 2 A cross-sectional view along line IV-IV.

[0023] Figure 5 This is a three-dimensional view of the main body of the hoisting device from the rear.

[0024] Figure 6 This is a rear view of the main body of the hoisting device.

[0025] Figure 7 This is a cross-sectional view of a hoisting device according to another embodiment.

[0026] Explanation of reference numerals in the attached figures

[0027] 1: Elevator, 2: Car, 2a: Stop section, 2b: Transmission section, 3: Car hoisting cable, 4: Counterweight, 5: Hoisting device, 6: Car track, 7: Counterweight track, 8: Speed ​​controller, 8a: Speed ​​controller hoisting cable, 8b: Speed ​​controller wheel, 8c: Tension wheel, 8d: Holding section, 9: Handling section, 10: Sheave, 11: Disc, 12: Braking section, 13: Main body, 14: Shaft, 14a: Root, 15: Rotating component, 15a: Sheave embedding section, 15b: Disc section, 15c: Rotor section, 1 5d: Permanent magnet; 16: Bearing; 17: Stator; 18: Base; 19: Frame; 20: Housing; 20a: Foot; 21: Cylindrical part; 21w: Inner diameter of cylindrical part; 22: Rib; 22a: Protrusion; 22w: Distance between the lower ends of the protrusions; 114: Shaft; 116: Bearing; 121: Cylindrical part; D1: First transverse direction; D11: First axial direction; D12: Second axial direction; D2: Second transverse direction; D3: Vertical direction; X1: Lifting path; X2: Mechanical room Detailed Implementation

[0028] The following is for reference Figures 1-6 The hoisting device of the elevator and one embodiment of the elevator will be described. It should be noted that the size ratios of the drawings may not be consistent with the actual size ratios, and the size ratios between the drawings may also not be consistent.

[0029] like Figure 1As shown, elevator 1 may include, for example, a car 2 for passengers, a car hoisting cable 3 connected to the car 2, a counterweight 4 connected to the car hoisting cable 3, and a hoisting device 5 that moves the car 2 and the counterweight 4 in the vertical direction D3 by driving the car hoisting cable 3. Additionally, elevator 1 may also include, for example, a car track 6 for guiding the car 2, a counterweight track 7 for guiding the counterweight 4, a speed controller 8 for detecting the moving speed of the car 2, and a processing unit 9 for controlling various parts of elevator 1.

[0030] In this embodiment, one end of the car hoisting cable 3 is fixed to the car 2, and the other end is fixed to the counterweight 4, but this configuration is not limited to this. For example, the two ends of the car hoisting cable 3 may be fixed to the upper or lower part of the lifting path X1, respectively, and the car hoisting cable 3 may be wound around the pulleys of the car 2 and the counterweight 4, thereby connecting the car hoisting cable 3 to the car 2 and the counterweight 4, respectively.

[0031] Furthermore, in the elevator 1 of this embodiment, the hoisting device 5 is configured to be disposed inside the machine room X2 located at the upper part of the lifting path X1, but the structure is not limited to this. For example, the hoisting device 5 may also be configured to be disposed inside the lifting path X1.

[0032] The speed controller 8 may, for example, include: an endless loop-shaped speed controller cable 8a connected to the car 2; a speed controller wheel 8b wound with the speed controller cable 8a to detect the speed of the car 2; a tension wheel 8c suspended from the speed controller cable 8a to apply tension to the speed controller cable 8a; and a gripping part 8d to grip the speed controller cable 8a. Thus, the speed controller 8 detects the moving speed of the car 2 based on the rotational speed of the speed controller wheel 8b.

[0033] The car 2 may also include, for example, a stop section 2a that stops the car 2 by clamping the car track 6, and a transmission section 2b that transmits the action of the speed controller 8 to the stop section 2a. Moreover, for example, it may be configured such that when the speed of the car 2 exceeds the set speed, the holding section 8d holds the speed controller cable 8a, stopping the movement of the speed controller cable 8a, thereby activating the stop section 2a of the car 2.

[0034] like Figure 2 and Figure 3 As shown, the hoisting device 5 may also include, for example, a sheave 10 on which the car hoisting cable 3 is wound, a disc 11 that rotates integrally with the sheave 10, and a braking part 12 that clamps the disc 11 on a first transverse direction D1, which is the rotation axis of the disc 11, in order to brake the sheave 10. Furthermore, the first side D11 in the first transverse direction D1 is also referred to as the axial first side D11, and the second side D12 is also referred to as the axial second side D12.

[0035] For example, when viewed from the first transverse direction D1, the rotation center of the pulley 10 may be the same as the rotation center of the disc 11. In addition, the outer diameter of the disc 11 may be larger than that of the pulley 10, and it may also be formed in an annular or plate shape.

[0036] In addition, such as Figure 4 As shown, the hoisting device 5 may also include, for example, a main body 13 fixed to the machine room X2; a shaft 14 protruding from the main body 13 toward the first transverse direction D1; and a rotating member 15 rotating about the shaft 14.

[0037] The rotating member 15 may include: a sheave insert 15a in which a sheave 10 is embedded; a disc 15b forming a disc 11; a cylindrical rotor 15c forming a motor; and a permanent magnet 15d disposed on the outer peripheral surface of the rotor 15c. The rotating member 15 is rotatably supported on the shaft 14 by a bearing 16 disposed on the inner peripheral side of the sheave insert 15a. Furthermore, the sheave 10 is fixed to the outer peripheral surface of the sheave insert 15a and rotates integrally with the rotating member 15. That is, the sheave 10 is rotatably supported on the shaft 14 by the bearing 16 and the rotating member 15.

[0038] The rotor portion 15c extends from the sheave insertion portion 15a toward the main body 13. The disc portion 15b is disposed at the root of the outer periphery of the rotor portion 15c. Furthermore, the disc portion 15b is formed in an annular shape on the outer periphery of the sheave insertion portion 15a. The braking portion 12 can apply braking to the sheave 10 by clamping the disc portion 15b from both sides of the first transverse direction D1. That is, the disc portion 15b is an example of a braking portion that performs braking by being pressed by the braking portion 12.

[0039] The hoisting device 5 may include a stator 17, which is radially spaced from the permanent magnet 15d on the outer periphery of the rotor portion 15c. The stator 17 is fixed to the main body 13. The stator 17 includes a plurality of coils spaced apart circumferentially.

[0040] like Figure 5 and Figure 6 As shown, the main body 13 may include, for example, a base portion 18 fixed to the mounting surface of the machine room X2, and a frame portion 19 extending upward from the base portion 18. It should be noted that there are no particular limitations on the method of fixing the base portion 18 and the mounting surface of the machine room X2. Furthermore, as described later, the hoisting device 5 can be used upside down; in this case, the following descriptions of the upside and down of the hoisting device 5 may be appropriately reversed.

[0041] The base portion 18 is composed of two plate-shaped members spaced apart on the second transverse direction D2. The frame portion 19 extends upward from the end edge of the first side D11 of the first transverse direction D1 of the base portion 18. That is, when viewed from the second transverse direction D2, the frame portion 19 and the base portion 18 are approximately "L" shaped.

[0042] The braking unit 12 can be configured, for example, to be mounted on the frame portion 19. Furthermore, the number of braking units 12 is not particularly limited; for example, four can be present in this embodiment. The braking unit 12 clamps the pulley 10 and is disposed on the opposite side of the base portion 18. Additionally, as... Figure 2 As shown, the braking unit 12 is located on the side where the car hoisting cable 3 is wound on the sheave 10, in other words, on the opposite side of the side where the car hoisting cable 3 is led out from the sheave 10.

[0043] Additionally, the main body 13 may include a housing portion 20, which is cylindrical with a bottom at the center of the frame portion 19. The housing portion 20 is composed of a cylindrical portion and an annular bottom protruding from the inner circumferential surface of the cylindrical portion. The stator 17 is fixed to the inner circumferential surface of the cylindrical portion of the housing portion 20. The outer circumferential surface of the cylindrical portion of the housing portion 20 may have multiple ridges to effectively dissipate heat generated by the motor. The lower part of the housing portion 20 is connected to the base portion 18 via feet 20a. The feet 20a extend from the base portion 18 toward the cylindrical portion 21 described later and are connected to the housing portion 20. Furthermore, the feet 20a are configured to separate from each other as they approach the base portion 18.

[0044] Additionally, the main body 13 may include a cylindrical portion 21 that protrudes from the bottom of the housing portion 20 in a first transverse direction D1. The cylindrical portion 21 protrudes from its inner periphery at the bottom towards a first side D11 of the first transverse direction D1. A shaft portion 14 is connected to the front end of the cylindrical portion 21. The cylindrical portion 21 and the shaft portion 14 may be coaxially arranged. To reduce the weight of the main body 13, the cylindrical portion 21 is formed as a hollow structure. The cylindrical portion 21 may have a shape that flares out towards the bottom of the housing portion 20. This helps to suppress stress concentration at the connection between the cylindrical portion 21 and the housing portion 20.

[0045] like Figure 4 As shown, the shaft portion 14 extends from the cylindrical portion 21 toward the first side D11 of the first transverse direction D1. A bearing 16 is disposed around the shaft portion 14. For example, the shaft portion 14 and the main body 13 may also be integrally formed by casting or the like. Furthermore, an encoder (not shown) may be disposed therein, as a through hole is formed in the center of the shaft portion 14.

[0046] The rotating member 15 is rotatably supported on the shaft portion 14 via the bearing 16. Furthermore, the rope pulley 10 is fixed to the rope pulley insert 15a and rotates integrally with the rotating member 15. That is, the rope pulley 10 is rotatably supported on the shaft portion 14 via the bearing 16 and the rotating member 15.

[0047] The shaft portion 14 is the shaft portion of a cantilever whose base end is cantilevered and supported by the cylindrical portion 21. It can be said that the cylindrical portion 21, through the shaft portion 14 connected to it, rotatably supports the rotating member 15. Therefore, there is a potential problem that due to the weight of the sheave 10 and the rotating member 15, the load from the car hoisting cable 3, etc., the shaft portion 14 experiences significant displacement relative to the base portion 18, and stress concentrates at the root portion 14a at the upper part of the shaft portion 14. By providing the rib 22 (described later) within the cylindrical portion 21 connected to the shaft portion 14, the amount of displacement of the shaft portion 14 can be reduced, and the stress concentration at the root portion 14a of the shaft portion 14 can be mitigated.

[0048] Rib 22 extends vertically along the vertical direction D3 within the cylindrical portion 21. The upper and lower ends of rib 22 are each connected to the inner circumferential surface of the cylindrical portion 21. It should be noted that although rib 22 extends linearly in the vertical direction D3, it can also extend in a curved shape. By providing rib 22 within the cylindrical portion 21, the cylindrical portion 21 is strengthened, thus dispersing the stress concentrated at the root 14a of the shaft portion 14 to the cylindrical portion 21, thereby mitigating stress concentration at the root 14a.

[0049] A pair of ribs 22 are arranged facing each other on the second transverse direction D2. Furthermore, the pair of ribs 22 are arranged to separate as they approach the base portion 18. That is, when viewed from the first transverse direction D1, the pair of ribs 22 form an inverted "V" shape. Here, the concept of an inverted "V" includes not only the shape where the upper ends of the two inclined lines are connected to each other, but also the shape where the upper ends of the two inclined lines are separated from each other. Preferably, the upper end of the rib 22 is located above the axis of the cylindrical portion 21, and the lower end of the rib 22 is located below the axis of the cylindrical portion 21. By arranging the pair of ribs 22 in an inverted "V" shape, the portion of the root portion 14a away from the axis portion 14 can be effectively strengthened; specifically, the lower portion of the main body 13 can be effectively strengthened, thus releasing the stress of the root portion 14a towards the lower portion of the main body 13. As a result, the stress concentration of the root portion 14a is alleviated. Furthermore, since the displacement of the cylindrical portion 21 relative to the base portion 18 is reduced by using a pair of ribs 22 to strengthen the lower part of the main body 13, the displacement of the shaft portion 14 can be reduced.

[0050] Preferably, the ends of the pair of ribs 22 furthest from the base portion 18 (here, the upper ends) are connected to each other. This allows the ribs 22 to be close to the root portion 14a of the shaft portion 14, thus the stress in the root portion 14a can be easily released through the ribs 22.

[0051] Although the spacing between the pair of ribs 22 is narrower near the root 14a and extends toward the base 18 in a manner that increases as they approach the base 18, however... Figure 6As shown, the rib 22 preferably extends toward the position where it connects to the foot 20a and the housing portion 20. That is, preferably, the extension lines of the pair of ribs 22 extending toward the base portion 18 pass through the pair of feet 20a respectively. In this way, the stress of the root portion 14a can be released to the base portion 18 through the ribs 22 and the feet 20a.

[0052] Rib 22 may include a protrusion 22a extending outward from the cylindrical portion 21 (on the second side D12 of the first transverse direction D1). This improves the reinforcing effect based on rib 22, further reduces the displacement of shaft portion 14, and further alleviates stress concentration at root portion 14a. Furthermore, the protrusion 22a may extend to base portion 18. This allows stress at root portion 14a to be released throughout the entire body 13, including to base portion 18, via rib 22, thus further alleviating stress concentration at root portion 14a.

[0053] Preferred, such as Figure 6 As shown, the distance 22w between the lower ends of the protrusions 22a is less than the inner diameter 21w of the cylindrical portion 21. This provides sufficient reinforcement based on the ribs 22 and the protrusions 22a. It should be noted that the distance 22w between the lower ends of the protrusions 22a is defined as the shortest distance between their lower ends. Furthermore, as in this embodiment, when the cylindrical portion 21 is unfolded at the hem, the inner diameter 21w of the cylindrical portion 21 is defined as the maximum inner diameter of the cylindrical portion 21.

[0054] [1] According to the above, preferably, the hoisting device 5 of the elevator 1 includes a main body 13, a rotating member 15 rotatably supported on the main body 13, and a rope wheel 10 that rotates integrally with the rotating member 15. The rotating member 15 includes a rope wheel embedding part 15a into which the rope wheel 10 is embedded, a cylindrical rotor part 15c extending from the rope wheel embedding part 15a toward the main body 13, and a braking part (a disc part in this embodiment) 15b disposed on the outer periphery of the rotor part 15c. The main body 13 includes a base part 18 fixed to the mounting surface, a frame part 19 extending upward or downward (upward in this embodiment) from the base part 18, a cylindrical part 21 protruding from the frame part 19 in a horizontal direction (a first horizontal direction D1 in this embodiment) and rotatably supporting the rope wheel embedding part 15a, and a pair of ribs 22 extending in the vertical direction D3 within the cylindrical part 21 and disposed to separate from each other as they approach the base part 18.

[0055] With this configuration, the lower part of the main body 13 can be effectively reinforced by a pair of ribs 22, thereby reducing the displacement of the cylindrical part 21 relative to the base part 18 and the displacement of the shaft part 14. As a result, the inclination of the braking part that rotates integrally with the pulley 10 can be reduced. In addition, since the lower part of the main body 13 is reinforced by a pair of ribs 22, the stress at the root 14a of the shaft part 14 can be released to the lower part of the main body 13, thus mitigating the stress concentration at the root 14a of the shaft part 14.

[0056] [2] In addition, in the hoisting device 5 of the elevator 1 described above [1], it is preferable that the ends of a pair of ribs 22 away from the base portion 18 are connected to each other.

[0057] With this configuration, the rib 22 can be positioned close to the root 14a of the shaft portion 14, thus facilitating the release of stress from the root 14a via the rib 22. This further alleviates stress concentration at the root 14a.

[0058] [3] In addition, in the hoisting device 5 of the elevator 1 described in [1] or [2] above, preferably, the main body 13 includes a pair of feet 20a extending from the base portion 18 to the cylindrical portion 21, and the extension lines of the pair of ribs 22 in the direction of extending towards the base portion 18 pass through the pair of feet 20a respectively.

[0059] With this configuration, the stress at the root 14a of the shaft portion 14 can be released to the base portion 18 through the rib 22 and the foot portion 20a.

[0060] [4] In addition, in any of the elevator 1 hoisting devices 5 described in [1] to [3] above, preferably, a pair of ribs 22 includes a protrusion 22a that protrudes outward from the cylindrical portion 21.

[0061] According to this configuration, the strengthening effect based on rib 22 can be improved, the displacement of shaft 14 can be further reduced, and the stress concentration at root 14a can be further mitigated.

[0062] [5] In addition, in the hoisting device 5 of the elevator 1 described above [4], the protrusion 22a preferably extends to the base portion 18.

[0063] According to this configuration, the stress of the root 14a can be released to the entire body 13, including the base portion 18, through the rib 22, thus further mitigating the stress concentration of the root 14a.

[0064] [6] In addition, preferably, the elevator 1 includes the hoisting device 5 of any one of [1] to [5] above.

[0065] With this configuration, the displacement of the cylindrical portion 21 relative to the base portion 18 can be reduced, and the displacement of the shaft portion 14 can be reduced, thus reducing the inclination of the braking part that rotates integrally with the rope wheel 10.

[0066] Furthermore, the elevator 1 and the hoisting device 5 are not limited to the configuration of the above-described embodiments, nor are they limited to the effects described above. Additionally, various modifications can be made to the elevator 1 and the hoisting device 5 without departing from the spirit of the invention. For example, any one or more of the following modified examples of configuration or method can be selected and applied to the configuration or method of the above-described embodiments.

[0067] (A) In the hoisting device 5 of the elevator 1 described above, a pair of ribs 22 are configured such that their ends away from the base portion 18 are connected to each other. However, the hoisting device 5 of the elevator 1 is not limited to this configuration. For example, the pair of ribs 22 may also be configured such that their ends away from the base portion 18 are separated from each other.

[0068] (B) In the hoisting device 5 of the elevator 1 described above, the main body 13 includes a pair of feet 20a extending from the base portion 18 to the cylindrical portion 21, and the extension lines of the pair of ribs 22 extending toward the base portion 18 pass through the pair of feet 20a respectively. However, the hoisting device 5 of the elevator 1 is not limited to this configuration. For example, even if the extension lines of the ribs 22 extending toward the base portion 18 do not pass through the feet 20a, a strengthening effect based on the ribs 22 can still be obtained.

[0069] (C) In the hoisting device 5 of the elevator 1 described above, the pair of ribs 22 includes a protrusion 22a that protrudes outward from the cylindrical portion 21. However, the hoisting device 5 of the elevator 1 is not limited to this configuration. For example, the pair of ribs 22 may also be formed only on the inner side of the cylindrical portion 21.

[0070] (D) In ​​the hoisting device 5 of the elevator 1 described above, the protrusion 22a extends to the base portion 18. However, the hoisting device 5 of the elevator 1 is not limited to this configuration. For example, it may be configured such that the protrusion 22a is disposed only inside the cylindrical portion 21 when viewed in the first transverse direction D1, or it may be configured to extend to the housing portion 20.

[0071] (E) In the hoisting device 5 of the elevator 1 described above, the cylindrical portion 21 supports the rotating member 15 rotatably via the shaft portion 14 connected to the cylindrical portion 21. However, the hoisting device 5 of the elevator 1 is not limited to this configuration. For example, as Figure 7 As shown, the cylindrical portion 121 can also be configured to support the rotating member 15 rotatably via the shaft portion 114 connected to the rotating member 15.

[0072] exist Figure 7 China endowed with Figures 1-6The parts of the accompanying drawings that are identical to the reference numerals represent elements that have substantially the same structure or function as those described above, and thus their description is omitted.

[0073] The rotating member 15 includes a shaft portion 114 fixed to the inner circumferential side of the rope sheave insertion portion 15a. That is, the shaft portion 114 rotates integrally with the rotating member 15. The shaft portion 114 extends from the rope sheave insertion portion 15a toward the main body 13 side (axial second side D12).

[0074] The main body 13 includes a cylindrical portion 121 that protrudes from the bottom of the housing portion 20 along a first transverse direction D1. The cylindrical portion 121 is longer than the cylindrical portion 21 in the above embodiment. A bearing 116 is disposed on the inner circumferential surface of the front end of the cylindrical portion 121. The rotating member 15 is rotatably supported on the cylindrical portion 121 by means of the bearing 116 disposed on the outer circumferential side of the shaft portion 114.

[0075] (F) In the hoisting device 5 of the elevator 1 described above, the braking unit 12 is a so-called disc brake that clamps the disc 11 on the first transverse direction D1 to brake the sheave 10, but it is not limited to this. For example, the braking unit 12 may also be a so-called drum brake that clamps the drum on the second transverse direction D2. That is, the braking action unit may also be a drum that is pressed by brake shoes.

[0076] (G) In the hoisting device 5 of the elevator 1 described in the above embodiment, although it is an inner rotor type motor structure with the stator 17 arranged on the outer peripheral side of the rotor portion 15c, it is not limited to this. For example, it may also be an outer rotor type motor structure with the stator 17 arranged on the inner peripheral side of the rotor portion 15c. In this case, the stator 17 is provided on the outer peripheral surface of the cylindrical portion 21, and the permanent magnet 15d is provided on the inner peripheral surface of the rotor portion 15c.

[0077] (H) In the elevator 1 of the above embodiment, the hoisting device 5 is disposed inside the machine room X2 provided at the upper part of the lifting path X1, but is not limited to this configuration. For example, the hoisting device 5 may also be disposed inside the lifting path X1. In this case, the hoisting device 5 may also... Figure 4 and Figure 7 The hoisting device 5 is used upside down. For example, when the hoisting device 5 is used upside down, the base portion 18 of the main body 13 is fixed from the bottom to the beam in the lifting path X1.

Claims

1. A hoisting device for an elevator, wherein, include: main body; A rotating component is rotatably supported on the main body; as well as The pulley rotates integrally with the rotating component; The rotating component includes: A rope sheave insertion part, in which the rope sheave is embedded; A cylindrical rotor portion extends from the sheave insertion portion toward the main body side; and A braking actuation part is disposed on the outer peripheral side of the rotor part; The subject includes: The base portion is fixed to the mounting surface; The frame portion extends upward or downward from the base portion; The cylindrical part protrudes horizontally from the frame part and supports the rope wheel insertion part for free rotation; A pair of ribs, extending vertically within the cylindrical portion, are configured to separate from each other as they approach the base portion. The upper end of the rib is located above the axis of the cylindrical portion, and the lower end of the rib is located below the axis of the cylindrical portion.

2. The hoisting device of the elevator according to claim 1, wherein, The ends of the pair of ribs that are away from the base portion are connected to each other.

3. The hoisting device of the elevator according to claim 1, wherein, The main body includes a pair of legs extending from the base portion toward the cylindrical portion. The extension lines of the pair of ribs extending toward the base portion pass through the pair of feet respectively.

4. The hoisting device of the elevator according to claim 1, wherein, The pair of ribs includes a protrusion that extends outward from the cylindrical portion.

5. The hoisting device of the elevator according to claim 4, wherein, The protrusion extends to the base portion.

6. An elevator, wherein, include: The hoisting device of the elevator according to any one of claims 1 to 5.

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