Elevator hoist bearing replacement aid and bearing replacement method

Abstract

Provided is a bearing replacement assisting tool for restricting a relative movement of a worm shaft in an axial direction in a bearing replacement operation for an elevator hoist. The hoist comprises a motor unit, a worm shaft one end of which is coupled to a rotating shaft of the motor unit, a gearbox through into which the worm shaft is inserted, a thrust bearing attached to the gearbox and supporting the worm shaft, and a brake wheel fixed to the worm shaft between the gearbox and the motor unit. The bearing replacement assisting tool includes a first restricting member that is held between the brake wheel and the gearbox above the worm shaft and restricts a relative movement of the worm shaft with respect to the gearbox when the operation for pulling the thrust bearing out of the gearbox is being performed. The bearing replacement assisting tool also includes a second restricting member that is held between the brake wheel and the motor unit above the worm shaft and restricts a relative movement of the worm shaft with respect to the motor unit when the operation for attaching the thrust bearing to the gearbox is being performed.

Description

[Technical Field]

[0001] The present disclosure relates to a technique for assisting bearing replacement work for an elevator hoisting machine. [Background technology]

[0002] Patent Document 1 discloses a technology related to an elevator hoisting machine. This technology claims that by supporting the load on the rotor shaft by a support base and one of the bearing devices, it is possible to remove the other bearing device and pull out the stator without using a lifting device such as a crane, thereby disassembling the motor and other components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 8-81164 Summary of the Invention [Problem to be solved by the invention]

[0004] The bearing of an elevator worm traction machine may be tightly fitted to the worm shaft. In this case, when removing the bearing from the worm shaft, the worm shaft itself may move axially along with the bearing. One possible solution to prevent this is to clamp a piece of lumber or similar material between the shaft and the bearing, but this poses problems in terms of strength and ease of use. The technology in Patent Document 1 does not disclose an effective means for restricting shaft movement when removing the bearing from the shaft.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a bearing replacement aid and a bearing replacement method that can restrict relative axial movement of the worm shaft during bearing replacement work in an elevator hoist. [Means for solving the problem]

[0006] The present disclosure applies to a bearing replacement aid used in bearing replacement work for an elevator hoisting machine. The hoisting machine includes a motor unit, a worm shaft one end of which is connected to the rotating shaft of the motor unit, a gearbox through which the worm shaft is inserted, a thrust bearing attached to the gearbox and supporting the worm shaft, and a brake wheel fixed to the worm shaft between the gearbox and the motor unit. The bearing replacement aid includes a first stop member that is sandwiched between the brake wheel and the gearbox above the worm shaft to restrict relative movement of the worm shaft with respect to the gearbox when the thrust bearing is pulled out of the gearbox. The first stop member has a shape in which two flat surfaces are connected so that a cross section perpendicular to the longitudinal direction has an upwardly convex mountain shape when the first stop member is disposed on the hoist. The present disclosure also applies to a bearing replacement aid used in bearing replacement work for an elevator hoist. The hoist includes a motor unit, a worm shaft connected at one end to the motor unit's rotating shaft, a gearbox through which the worm shaft is inserted, a thrust bearing attached to the gearbox and supporting the worm shaft, and a brake wheel fixed to the worm shaft between the gearbox and the motor unit. The bearing replacement aid includes a first stop member sandwiched between the brake wheel and the gearbox above the worm shaft to restrict relative movement of the worm shaft with respect to the gearbox when the thrust bearing is removed from the gearbox, and a second stop member sandwiched between the brake wheel and the motor unit above the worm shaft to restrict relative movement of the worm shaft with respect to the motor unit when the thrust bearing is attached to the gearbox. When the second stop member is placed on the hoist, two flat surfaces are connected so that a cross section perpendicular to the longitudinal direction forms an upwardly convex mountain shape.

[0007] The present disclosure also applies to a bearing replacement method for an elevator hoist. The hoist includes a motor, a worm shaft one end of which is connected to the rotating shaft of the motor, a gearbox through which the worm shaft is inserted, a thrust bearing attached to the gearbox and supporting the worm shaft, and a brake wheel fixed to the worm shaft between the gearbox and the motor. The bearing replacement method includes the steps of installing a first stop member between the brake wheel and the gearbox, pulling out the thrust bearing from the worm shaft, and removing the first stop member from the hoist.

[0008] The present disclosure also applies to a bearing replacement method for an elevator hoist. The hoist includes a motor, a worm shaft connected at one end to a rotating shaft of the motor, a gearbox through which the worm shaft is inserted, a thrust bearing attached to the gearbox and supporting the worm shaft, and a brake wheel fixed to the worm shaft between the gearbox and the motor. The bearing replacement method includes the steps of installing a second stop member between the brake wheel and the motor, attaching the thrust bearing to the worm shaft, and removing the second stop member from the hoist. [Effects of the Invention]

[0009] The bearing replacement aid of the present disclosure can restrict relative axial movement of the worm shaft during bearing replacement work, thereby improving the efficiency of bearing replacement work. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram showing the external configuration of a hoist to which a bearing replacement auxiliary tool according to an embodiment is applied; [Figure 2] FIG. 2 is a schematic diagram showing the internal structure around the gear box of the hoisting machine. [Figure 3] 10A and 10B are schematic diagrams for explaining the removal work of the thrust bearing. [Figure 4] FIG. 2 is a perspective view showing a bearing replacement auxiliary tool for a hoist according to the present embodiment. [Figure 5] 10A and 10B are three-view diagrams of a first stop member. [Figure 6] 10A and 10B are three-view diagrams of a second stop member. [Figure 7] FIG. 10 is a schematic diagram showing a state in which a first stop member is disposed on a hoisting machine. [Figure 8] FIG. 10 is a schematic diagram showing a state in which a second regulating member is disposed on the hoisting machine. [Figure 9] FIG. 10 is a diagram showing a state in which the first stop member is installed on the hoist. [Figure 10] FIG. 10 is a schematic view showing a state in which the first stop member is installed on the hoist, seen from the gear box side toward the brake wheel with the gear box being see-through. [Figure 11] FIG. 10 is a partially enlarged view showing a state in which the second regulating member is installed on the hoist. [Figure 12] 10 is a schematic view showing the state in which the second regulating member is installed on the hoist, seen from the motor unit side toward the brake wheel with the motor unit being transparent. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0012] Embodiment 1. External configuration of a hoist to which a bearing replacement auxiliary tool according to an embodiment is applied Fig. 1 is a diagram showing the external configuration of a hoist to which a bearing replacement aid in an embodiment is applied. Fig. 2 is a schematic diagram showing the internal structure around the gear box of the hoist. The hoist 10 is a worm hoist for an elevator. The hoist 10 is installed in the machine room of the elevator.

[0013] The hoisting machine 10 includes, as main components related to the bearing replacement work, a gearbox 12, a motor unit 14, a brake wheel 16, a hoisting sheave 17, and a worm shaft 20. The hoisting machine 10 also includes various other components in addition to these, but a description of these components will be omitted.

[0014] The gearbox 12 constitutes part of the structure of the hoist 10. A thrust bearing hole 121 and a gland bearing hole 122 are formed in opposing positions in the gearbox 12. In the following description, the side of the gearbox 12 on which the gland bearing hole 122 is formed is referred to as the "gland side," and the side on which the thrust bearing hole 121 is formed is referred to as the "thrust side."

[0015] The gear box 12 includes a bearing box 22 that houses a thrust bearing 24. The bearing box 22 is fitted into a thrust bearing hole 121 with the thrust bearing 24 housed inside. A bearing cover 18 is attached to the opening of the bearing box 22 with cover bolts 19. A gland bearing 26 is fitted into the gland bearing hole 122.

[0016] The worm shaft 20 is inserted through the gear box 12 from the gland side toward the thrust side and is supported by a thrust bearing 24 and a gland bearing 26. A worm gear 202 of the worm shaft 20 is meshed with a link gear (not shown) inside the gear box 12. The link gear transmits the rotational force of the worm shaft 20 to the winding sheave 17. In the following description, the axial direction of the worm shaft 20 from the gland side toward the thrust side will be referred to as the "thrust direction," and the direction from the thrust side toward the gland side will be referred to as the "gland direction."

[0017] The motor unit 14 is detachably mounted on the structure of the hoisting machine 10 with bolts. The ground side end of the worm shaft 20 is connected to the rotating shaft of the motor unit 14. When the rotating shaft of the motor unit 14 rotates, the worm shaft 20 rotates accordingly.

[0018] The brake wheel 16 is a part of the brake mechanism, and is a component fixed so as to rotate together with the worm shaft 20. The brake wheel 16 is disposed on the worm shaft 20 between the gear box 12 and the motor section 14.

[0019] 2. Features of the bearing replacement aid in the embodiment The hoist 10 may require replacement of the thrust bearing 24 and the gland bearing 26. Fig. 3 is a schematic diagram illustrating the removal of the thrust bearing. When removing the thrust bearing 24, an operator first removes the cover bolts 19 and removes the bearing cover 18. Then, two prepared jack bolts 28 are threaded into the threaded holes of the bearing housing 22 and tightened evenly. As a result, the bearing housing 22, together with the thrust bearing 24, is gradually pulled out from the thrust bearing hole 121 in the thrust direction of the worm shaft 20.

[0020] Here, the thrust bearing 24 is tightly engaged with the worm shaft 20. For this reason, when the thrust bearing 24 is pulled out in the thrust direction, the worm shaft 20 may also be pulled in the thrust direction. To solve this problem, it is conceivable to restrict the relative movement of the brake wheel 16 with respect to the gear box 12 by, for example, placing a suitable block of wood or other lumber between the gland-side wall surface of the gear box 12 and the wall surface of the brake wheel 16 when pulling out the bearing housing 22. However, block materials such as wood have issues with strength and ease of use.

[0021] The bearing replacement aid of this embodiment is an aid for restricting relative movement of the worm shaft 20 with respect to the gearbox 12 during replacement work of such thrust bearing 24. Fig. 4 is a perspective view showing the bearing replacement aid for a hoist of this embodiment. The bearing replacement aid includes a first stop member 30 and a second stop member 40. Fig. 5 is a three-view diagram of the first stop member. Fig. 6 is a three-view diagram of the second stop member.

[0022] The first stop member 30 is an auxiliary tool that is sandwiched between the brake wheel 16 and the ground side of the gearbox 12 above the worm shaft 20. The first stop member 30 has a first flat portion 302 and a second flat portion 304. The first flat portion 302 and the second flat portion 304 are both rectangular, with one longitudinal side connected to each other so that a cross section perpendicular to the longitudinal direction forms a mountain shape. There is no limitation on the angle formed by the first flat portion 302 and the second flat portion 304. Typically, the first stop member 30 has two flat surfaces connected so that the angle formed by the first flat portion 302 and the second flat portion 304 is a right angle in a cross section perpendicular to the longitudinal direction. The first stop member 30 can be, for example, an L-shaped angle bar measuring 3 mm x 30 mm x 30 mm.

[0023] The total length in the longitudinal direction of the first stop member 30 is set taking into consideration the positional relationship between the gear box 12 and the brake wheel 16 of the hoist 10. FIG. 7 is a schematic diagram showing the arrangement of the first stop member in the hoist. As shown in this figure, the first stop member 30 is set to have a total length that allows it to fit in the longitudinal direction above the worm shaft 20 between the ground side of the gear box 12 of the hoist 10 and the brake wheel 16. Typically, the total length in the longitudinal direction of the first stop member 30 is set to be slightly shorter than the distance between the ground-side side surface 123 of the gear box 12 and the side surface 161 of the brake wheel 16 that faces that side surface. The total length in the longitudinal direction of the first stop member 30 is, for example, 70 mm.

[0024] The first stop member 30 has first chamfered portions 306 at both corners on the edge side of the first flat surface portion 302. Similarly, the first stop member 30 has first chamfered portions 306 at both corners on the edge side of the second flat surface portion 304. There are no limitations on the shape or size of the first chamfered portions 306. Here, the first chamfered portions 306 are formed over a range of approximately one-third of the short-side length of the first flat surface portion 302 and the second flat surface portion 304. If the first stop member 30 is, for example, an L-shaped angle bar measuring L3 x 30 x 30, each side of the first chamfered portions 306 is 10 mm.

[0025] A label portion 308 having the words "Ground Side" written on it is attached to the first flat portion 302. There are no limitations on the shape, size, or color of the label portion 308. The label portion 308 may cover the entire surface of the first flat portion 302. The color of the label portion 308 is preferably an easily visible color such as a fluorescent color. Furthermore, the configuration of the label portion 308 is not essential to the first stop member 30.

[0026] The second stop member 40 is an auxiliary tool that is sandwiched between the brake wheel 16 and the motor unit 14 above the worm shaft 20. The second stop member 40 may have a structure similar to that of the first stop member 30, except for its overall length in the longitudinal direction. Specifically, the second stop member 40 has a first flat portion 402 and a second flat portion 404. The first flat portion 402 and the second flat portion 404 are both rectangular, with one longitudinal side connected to the other so that a cross section perpendicular to the longitudinal direction forms a mountain shape. The angle between the first flat portion 402 and the second flat portion 404 is not limited. Typically, the second stop member 40 has two flat surfaces connected so that the first flat portion 402 and the second flat portion 404 form a right angle in a cross section perpendicular to the longitudinal direction. The second stop member 40 may be made of an L-shaped angle bar measuring, for example, 3 mm x 30 mm x 30 mm.

[0027] The total length of the second stop member 40 in the longitudinal direction is set in consideration of the positional relationship between the motor unit 14 and the brake wheel 16 of the hoist 10. FIG. 8 is a schematic diagram showing the arrangement of the second stop member in the hoist. As shown in this figure, the brake wheel 16 has a cylindrical protrusion 163 that protrudes in the ground direction of the worm shaft 20 at the center where the worm shaft 20 is fixed. The total length of the second stop member 40 in the longitudinal direction is set to be slightly shorter than the distance between a side surface 142 of the motor unit 14 on the brake wheel 16 side and a side surface 164 of the protrusion 163 that faces the side surface 142. The total length of the second stop member 40 in the longitudinal direction is, for example, 80 mm.

[0028] The second stop member 40 has second chamfered portions 406 at both corners on the edge side of the first flat surface portion 402. Similarly, the second stop member 40 has second chamfered portions 406 at both corners on the edge side of the second flat surface portion 404. There is no limitation on the size of the second chamfered portions 406. Here, the second chamfered portions 406 are formed over a range of approximately one-third of the short-side length of the first flat surface portion 402 and the second flat surface portion 404. If the second stop member 40 is, for example, an L-shaped angle bar measuring L3 x 30 x 30, the second chamfered portions 406 have sides of 10 mm.

[0029] A label portion 408 having the words "motor side" written on it is attached to the first flat portion 402. There are no limitations on the shape, size, or color of the label portion 408. The label portion 408 may cover the entire surface of the first flat portion 402. The color of the label portion 408 is preferably an easily visible color such as a fluorescent color. Furthermore, the configuration of the label portion 408 is not essential to the second restricting member 40.

[0030] 3. Bearing replacement procedure using bearing replacement aids Next, a detailed description will be given of a method for removing and installing the thrust bearing 24 using the bearing replacement aid of the embodiment. Note that the method for removing and installing the thrust bearing 24 includes various steps in addition to those described below, but a description of these steps will be omitted here.

[0031] Preparation process: Removal of bearing cover The worker removes the cover bolts 19 and removes the bearing cover 18. This exposes the thrust bearing 24 fitted inside the bearing housing.

[0032] First step: Installation of first restricting member An operator installs the first stop member 30 on the hoist 10. Fig. 9 is a diagram showing the state in which the first stop member is installed on the hoist. Fig. 10 is a schematic diagram showing the state in which the first stop member is installed on the hoist, seen from the gearbox side towards the brake wheel with the gearbox seen through.

[0033] As shown in these figures, the brake wheel 16 has a cylindrical protrusion 162 that protrudes in the thrust direction at the center where the worm shaft 20 is fixed. The first stop member 30 is arranged above the protrusion 162 of the brake wheel 16 with its longitudinal direction aligned with the axial direction of the worm shaft 20 and oriented so as to be convex upward. This restricts relative movement of the brake wheel 16 and the worm shaft 20 fixed thereto in the thrust direction with respect to the gearbox 12.

[0034] Second step: Removal of thrust bearing 24 The worker screws the two prepared jack bolts 28 into the threaded holes of the bearing box 22 and tightens them evenly. The worm shaft 20 is restricted from moving in the thrust direction relative to the gear box 12 by the first stop member 30. Therefore, the bearing box 22 is gradually pulled out in the thrust direction from the thrust bearing hole 121, leaving the worm shaft 20 behind. As a result, the thrust bearing 24 fitted inside the bearing box 22 is pulled out from the worm shaft 20.

[0035] Third step: Removal step of the first stop member 30 Once the thrust bearing 24 has been pulled out from the worm shaft 20, the worker removes the first stop member 30 that was previously placed thereon.

[0036] Fourth process: Installation of bearing replacement aid As a preparatory step for the installation step of the thrust bearing 24, an operator installs the second stop member 40 on the hoist 10. Fig. 11 is a partially enlarged view showing the state in which the second stop member has been installed on the hoist. Fig. 12 is a schematic view showing the state in which the second stop member has been installed on the hoist, seen from the motor unit side toward the brake wheel with the motor unit seen through.

[0037] As shown in these figures, the second stop member 40 is arranged with its longitudinal direction aligned with the axial direction of the worm shaft 20, and is oriented so as to be convex upward between the side surface 164 of the protruding portion 163 of the brake wheel 16 and the side surface 142 of the motor unit 14. This restricts the relative movement of the brake wheel 16 and the worm shaft 20 fixed thereto in the ground direction with respect to the motor unit 14 and the gearbox 12.

[0038] Fifth step: Mounting the thrust bearing 24 The worker installs the bearing housing 22 into the thrust bearing hole 121. Then, after subjecting the new thrust bearing 24 to a known heating and cooling process, the worker fits the thrust bearing 24 onto the worm shaft 20 and inserts it into the bearing housing 22. The worm shaft 20 is restricted from moving relative to the gear box 12 in the gland direction by the second stop member 40. Therefore, the thrust bearing 24 is fitted all the way into the bearing housing 22, leaving the worm shaft 20 behind. As a result, the thrust bearing 24 is attached to the worm shaft 20.

[0039] 4. Function and effect of bearing replacement aid The bearing replacement aid described above provides the following functions and effects.

[0040] When the thrust bearing 24 is being pulled out from the gearbox 12, the first stop member 30 is sandwiched between the brake wheel 16 and the gearbox 12 above the worm shaft 20, thereby restricting relative movement of the worm shaft 20 with respect to the gearbox 12. This improves the efficiency of the work of pulling out the thrust bearing 24 from the gearbox 12.

[0041] When the first stop member 30 is installed on the hoist 10, the first flat portion 302 and the second flat portion 304 are connected so that a cross section perpendicular to the longitudinal direction has an upwardly convex mountain shape. With this configuration, the first stop member 30 can be stably installed above the worm shaft 20.

[0042] The first stop member 30 is configured so that the angle between the first flat surface portion 302 and the second flat surface portion 304 is a right angle in a cross section perpendicular to the longitudinal direction. With this configuration, the first stop member 30 can be formed using a general-purpose L-shaped angle bar, facilitating the production of the first stop member 30. Furthermore, the first stop member 30 has sufficient strength to function as a resistance member when compressed in the longitudinal direction.

[0043] The first stop member 30 has a first chamfered portion 306 at the corner of the first flat portion 302 and the second flat portion 304. This configuration makes it possible to prevent the corner from getting caught when the first stop member 30 is installed in a narrow portion of the hoisting machine 10, making installation easier and preventing damage to the hoisting machine 10. The first chamfered portion 306 also contributes to preventing injury to workers handling the first stop member 30.

[0044] When the thrust bearing 24 is being attached to the gearbox 12, the second stop member 40 is sandwiched between the brake wheel 16 and the motor unit 14 above the worm shaft 20, thereby restricting relative movement of the worm shaft 20 with respect to the motor unit 14. This improves the efficiency of the attachment of the thrust bearing 24 to the gearbox 12.

[0045] When the second stop member 40 is installed on the hoist 10, the first flat portion 402 and the second flat portion 404 are connected so that a cross section perpendicular to the longitudinal direction has an upwardly convex mountain shape. With this configuration, the second stop member 40 can be stably installed above the worm shaft 20.

[0046] The second stop member 40 is configured so that the angle between the first flat surface portion 402 and the second flat surface portion 404 is a right angle in a cross section perpendicular to the longitudinal direction. With this configuration, the second stop member 40 can be formed using a general-purpose L-shaped angle bar, facilitating the production of the second stop member 40. Furthermore, the second stop member 40 has sufficient strength to function as a resistance member when compressed in the longitudinal direction.

[0047] The second stop member 40 has second chamfered portions 406 at both corners of each of the first flat portion 402 and the second flat portion 404. This configuration makes it possible to prevent the corners from getting caught when the second stop member 40 is installed in a narrow portion of the hoisting machine 10, making installation easier and preventing damage to the hoisting machine 10. The second chamfered portions 406 also contribute to preventing injury to workers handling the second stop member 40.

[0048] 5. Variations The bearing replacement aid of this embodiment may employ the following modified forms.

[0049] The bearing replacement aid may be configured to include only one of the first stop member 30 and the second stop member 40.

[0050] The first stop member 30 may be set to a length that allows it to be installed between the ground side surface portion 123 of the gear box 12 and the end surface portion of the protrusion 162 facing the side surface portion 123, and may be positioned so as to abut against the worm shaft 20.

[0051] The second stop member 40 may be disposed on the upper portion of the protruding portion 163 of the brake wheel 16 with its longitudinal direction aligned with the axial direction of the worm shaft 20 and oriented so as to be convex upward. In this case, the total length of the second stop member 40 in the longitudinal direction may be set to be slightly shorter than the distance between the side surface portion 142 of the motor unit 14 on the brake wheel 16 side and the side surface of the brake wheel 16 facing the side surface portion 142. [Explanation of symbols]

[0052] 10 hoist, 12 gear box, 14 motor section, 16 brake wheel, 17 sheave, 18 bearing cover, 19 cover bolt, 20 worm shaft, 22 bearing box, 24 thrust section bearing, 26 gland section bearing, 28 jack bolt, 30 first stop member, 40 second stop member, 121 thrust portion bearing hole, 122 gland portion bearing hole, 123 side portion, 142 side portion, 161 side portion, 163 protrusion portion, 164 side portion, 202 worm gear, 302 first flat portion, 304 second flat portion, 306 first chamfered portion, 308 label portion, 402 first flat portion, 404 second flat portion, 406 second chamfered portion, 408 label portion

Claims

1. A bearing replacement aid used in bearing replacement work for elevator hoists, The hoisting machine is The motor and a worm shaft having one end connected to the rotary shaft of the motor unit; a gear box through which the worm shaft is inserted; a thrust bearing attached to the gearbox and supporting the worm shaft; a brake wheel fixed to the worm shaft between the gear box and the motor unit, The bearing replacement aid includes: When the thrust bearing is pulled out from the gearbox, a first stop member that is sandwiched between the brake wheel and the gear box above the worm shaft and that stops the worm shaft from moving relative to the gear box; The first stop member is When placed on the hoist, the cross section perpendicular to the longitudinal direction has a shape in which two planes are connected so as to have an upwardly convex mountain shape. Auxiliary tool for replacing bearings in elevator hoists.

2. The first stop member is In a cross section perpendicular to the longitudinal direction, the two planes of the first stop member are connected so that the angle formed by the two planes is a right angle. The bearing replacement aid for an elevator hoisting machine according to claim 1.

3. The first stop member has first chamfered portions at the corners of the two flat surfaces of the first stop member. The bearing replacement aid for an elevator hoisting machine according to claim 1 or 2.

4. The bearing replacement aid includes: When the thrust bearing is attached to the gearbox, a second restricting member that is sandwiched between the brake wheel and the motor unit above the worm shaft and restricts relative movement of the worm shaft with respect to the motor unit; The bearing replacement aid for an elevator hoisting machine according to claim 1 or 2.

5. The second stop member is When placed on the hoist, the cross section perpendicular to the longitudinal direction has a shape in which two planes are connected so as to have an upwardly convex mountain shape. The bearing replacement aid for an elevator hoisting machine according to claim 4.

6. The second stop member is In a cross section perpendicular to the longitudinal direction, the two planes of the second stop member are connected to form a right angle. The bearing replacement aid for an elevator hoisting machine according to claim 5.

7. The second stop member has second chamfered portions at the corners of the two flat surfaces of the second stop member. The bearing replacement aid for an elevator hoisting machine according to claim 5.

8. A bearing replacement aid used in bearing replacement work for an elevator hoist, The hoisting machine is The motor and a worm shaft having one end connected to the rotary shaft of the motor unit; a gear box through which the worm shaft is inserted; a thrust bearing attached to the gearbox and supporting the worm shaft; a brake wheel fixed to the worm shaft between the gear box and the motor unit, The bearing replacement aid includes: a first stop member that is sandwiched between the brake wheel and the gear box above the worm shaft and that stops relative movement of the worm shaft with respect to the gear box during an operation to pull out the thrust portion bearing from the gear box; a second stop member that is sandwiched between the brake wheel and the motor unit above the worm shaft during an operation of attaching the thrust portion bearing to the gearbox, and that stops the worm shaft from moving relative to the motor unit, The second stop member is When placed on the hoist, the cross section perpendicular to the longitudinal direction has a shape in which two planes are connected so as to have an upwardly convex mountain shape. Auxiliary tool for replacing bearings in elevator hoists.

9. A method for replacing bearings in an elevator hoist, comprising: The hoisting machine is The motor and a worm shaft having one end connected to the rotary shaft of the motor unit; a gear box through which the worm shaft is inserted; a thrust bearing attached to the gearbox and supporting the worm shaft; a brake wheel fixed to the worm shaft between the gear box and the motor unit, The bearing replacement method includes: a step of installing the first stop member according to claim 1 between the brake wheel and the gear box; extracting the thrust bearing from the worm shaft; removing the first stop member from the hoist; A bearing replacement method for an elevator hoisting machine.

10. A method for replacing bearings in an elevator hoist, comprising: The hoisting machine is The motor and a worm shaft having one end connected to the rotary shaft of the motor unit; a gear box through which the worm shaft is inserted; a thrust bearing attached to the gearbox and supporting the worm shaft; a brake wheel fixed to the worm shaft between the gear box and the motor unit, The bearing replacement method includes: a step of installing the second stop member according to claim 4 between the brake wheel and the motor unit; attaching the thrust bearing to the worm shaft; removing the second regulating member from the hoisting machine; A bearing replacement method for an elevator hoisting machine.

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