Reduction gear rotary shaft fixture and reduction gear rotary shaft fixing method

Abstract

To enable removable work of a bearing, coupling, etc. alone.SOLUTION: A reduction gear rotary shaft fixture 10 is detachably attached to a rotary shaft 2 of a reduction gear 1 assembled in a hoist of an elevator and fixes the rotary shaft 2 to a frame 3 of the reduction gear 1. The fixture 10 comprises a body part 11, a key 11k, a flange part 20, a screw 28, and a handle 30. The body part 11 is cylindrical and the rotary shaft 2 is inserted thereinto. The key 11k protrudes from the inner circumferential surface of the body part 11, and is engaged with a key groove 2k formed on the rotary shaft 2. The flange part 20 extends outward in the radial direction of the body part 11 from the edge surface or outer circumferential surface of the body part 11 at one end of the body part 11. The flange part 20 has a first through hole penetrating through the thick direction thereof. The screw 28 is inserted into the first through hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a jig for fixing a rotating shaft for a reducer and a method for fixing a rotating shaft for a reducer. [Background technology]

[0002] An elevator hoist is equipped with a reducer. Bearings and couplings are attached to the rotating shaft of the reducer. When renovating an elevator, the bearings and couplings attached to the rotating shaft may need to be replaced. Replacing a bearing or coupling is done by releasing the brake on the rotating shaft, removing the bearing or coupling from the rotating shaft, and installing a new bearing or coupling.

[0003] When removing a bearing or coupling from a rotating shaft, a removal tool utilizing a threaded structure, such as a gear puller, is generally used. With a gear puller, the set screw is rotatable relative to the rotating shaft, but the holding part is immobile relative to the bearing or coupling (and therefore the rotating shaft). By rotating the set screw relative to the rotating shaft, the holding part moves in the axial direction of the rotating shaft, thereby removing the bearing or coupling from the rotating shaft. As described above, the brake of the rotating shaft is released when replacing a bearing or coupling. Therefore, removing a bearing or coupling from a rotating shaft requires two workers: one to fix the rotating shaft at one end and another to operate the gear puller at the other end. The rotating shaft is fixed by attaching a hand-wound handle, such as that disclosed in Japanese Patent Laid-Open Publication No. 64-2989, to the rotating shaft, and the worker grips the handle to prevent it from rotating. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 64-2989 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, with the conventional method, it is not possible for one person to remove the bearings or couplings alone. Also, fixing the rotating shaft requires a great deal of effort. However, there is a need for more efficient removal work.

[0006] The present invention has been made in consideration of the above points, and has as its object to enable the removal of bearings, couplings, etc., to be performed by one person. [Means for solving the problem]

[0007] The rotating shaft fixing jig for a reducer according to this embodiment is A reducer rotating shaft fixing jig that is detachably attached to a rotating shaft of a reducer assembled in an elevator hoist and fixes the rotating shaft to a frame of the reducer, a cylindrical main body into which the rotating shaft is inserted; a key that protrudes from an inner peripheral surface of the main body and engages with a key groove formed in the rotary shaft; a flange portion at one end of the main body portion, extending radially outward from an end face or an outer peripheral surface of the main body portion, the flange portion having a first through hole formed therein and penetrating in a thickness direction of the flange portion; a screw inserted into the first through hole; a handle extending radially outward from an outer circumferential surface of the main body or the flange; Equipped with.

[0008] Further, the method for fixing the rotating shaft for a reducer according to this embodiment is as follows: A method for fixing a rotating shaft of a reducer assembled in an elevator hoist to a frame of the reducer, comprising: a step of preparing a jig including a cylindrical main body into which the rotary shaft is inserted, a key protruding from an inner peripheral surface of the main body and engaging with a key groove formed in the rotary shaft, and a handle having a handle base extending radially outward from the outer peripheral surface of the main body and a grip extending from the handle base in a direction along the axis of the main body; inserting the rotating shaft into the body portion so that the handle faces the frame and the key engages with the key groove; a step of rotating the handle together with the rotation shaft while the rotation shaft is inserted into the main body portion, and bringing the grip into contact with the frame in a circumferential direction of the rotation shaft; Equipped with. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a rotating shaft fixing jig for a reducer according to an embodiment of the present invention, together with the reducer. [Figure 2] FIG. 2 is a cross-sectional view of the jig and the reducer shown in FIG. [Figure 3] FIG. 3 is an enlarged view of the area surrounded by the two-dot chain line in FIG. [Figure 4] FIG. 4 is a view corresponding to FIG. 3, showing a method of attaching the jig to a rotary shaft when the jig is used as a hand-winding handle. [Figure 5] FIG. 5 is a perspective view showing a cover that covers the end of the rotation shaft of the reducer. [Figure 6] FIG. 6 is a diagram showing a jig attached to a rotating shaft as viewed in a direction along the central axis of the rotating shaft, and is a diagram for explaining a method of fixing the rotating shaft using the jig. [Figure 7] FIG. 7 is a view corresponding to FIG. 6, and is a view for explaining a method of fixing the rotating shaft using a jig. [Figure 8] FIG. 8 is a perspective view showing a modified example of the jig. [Figure 9] FIG. 9 is a cross-sectional view taken along line F9-F9 in FIG. [Figure 10]FIG. 10 is a perspective view showing another modified example of the jig. [Figure 11] FIG. 11 is a cross-sectional view taken along line F11-F11 in FIG. [Figure 12] FIG. 12 is a view corresponding to FIG. 10, showing a method for removing the flange portion from the main body portion. [Figure 13] FIG. 13 is a perspective view showing yet another modified example of the jig. [Figure 14] FIG. 14 is an exploded perspective view of the jig shown in FIG. [Figure 15] FIG. 15 is a perspective view showing yet another modified example of the jig. [Figure 16] FIG. 16 is a cross-sectional view taken along line F16-F16 in FIG. [Figure 17] FIG. 17 is a perspective view showing yet another modified example of the jig. [Figure 18] FIG. 18 is a perspective view for explaining a modified example of the method for fixing the rotating shaft. [Figure 19] FIG. 19 is a perspective view showing a method of attaching the jig shown in FIG. 19 to a rotary shaft when the jig is used as a hand-winding handle. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a reducer 1 incorporated in an elevator hoist. FIG. 2 is a cross-sectional view of the reducer 1. The reducer 1 reduces the speed of rotation input from a motor and outputs the reduced speed to a hoist sheave. The reducer 1 has a rotating shaft 2 to which rotation from the motor is input, a speed reduction mechanism (not shown) that reduces the speed of the rotation input to the rotating shaft 2 and outputs the reduced speed, and a frame 3 that houses a portion of the rotating shaft 2 and the speed reduction mechanism. The rotating shaft 2 is supported by the frame 3. The rotating shaft 2 is rotatable around its central axis 2X relative to the frame 3. Hereinafter, the radial direction of a circle centered on the central axis 2X of the rotating shaft 2 will be referred to as the radial direction of the rotating shaft 2. Furthermore, the circumferential direction of a circle centered on the central axis 2X of the rotating shaft 2 will be referred to as the circumferential direction of the rotating shaft 2.

[0011] As shown in FIG. 2 , the rotating shaft 2 has a first end 2a and a second end 2b. The first end 2a extends from a first surface 3a of the frame 3. The second end 2b extends from a second surface 3b of the frame 3. The first surface 3a and the second surface 3b face each other in the direction of the central axis 2X. A key groove 2k is formed at each location on the rotating shaft 2. The key groove 2k is formed at least on the first end 2a and the second end 2b of the rotating shaft 2. The key groove 2k is formed on the first end 2a, allowing a handwheel to be attached to the first end 2a to manually rotate the rotating shaft 2. The key groove 2k is formed on the second end 2b, allowing a coupling (shaft joint) 5 for connecting a motor or the like to be attached to the second end 2b so as to be non-rotatable relative to the rotating shaft 2.

[0012] In the example shown in Fig. 2, bearings and a coupling 5 are attached to the rotating shaft 2. The rotating shaft 2 shown in Fig. 2 is further attached with a rotating shaft fixing jig 10 for a reducer (hereinafter also simply referred to as "jig 10") that fixes the rotating shaft 2 to the frame 3, and a gear puller 6. The jig 10 is attached to a first end 2a of the rotating shaft 2, and the gear puller 6 is attached to a second end 2b.

[0013] The gear puller 6 is used when removing a bearing or coupling 5 from a rotating shaft 2. The gear puller 6 has a set screw 7 and a holding portion 8. The holding portion 8 is threadedly engaged with the set screw 7. The gear puller 6 is installed on the second end 2b of the rotating shaft 2 so that the central axis 7X of the set screw 7 roughly coincides with the central axis 2X of the rotating shaft 2 and so that the holding portion 8 holds the bearing or coupling 5. By rotating the set screw 7 around its central axis 7X relative to the rotating shaft 2, the holding portion 8 moves in a direction along the central axis 7X, and the bearing or coupling 5 held by the holding portion 8 is removed from the rotating shaft 2. In the example shown in FIG. 2 , the holding portion 8 holds the coupling 5.

[0014] The jig 10 is detachably attached to the rotating shaft 2. The jig 10 is attached to the rotating shaft 2 so as to be unrotatable relative to the rotating shaft 2 and the frame 3. By using such a jig 10, it is possible to prevent the rotating shaft 2 from rotating together with the set screw 7 when rotating the set screw 7 of the gear puller 6. Therefore, according to this embodiment, when performing the removal work, an operator is not required to hold the rotating shaft 2 unrotatably. As a result, the removal work can be performed efficiently.

[0015] The jig 10 has a cylindrical main body 11, a key 11k that engages with a key groove 2k of the rotating shaft 2, a flange portion 20 extending from the main body 11, a screw 28 that fixes the flange portion 20 to the frame 3, and a handle 30.

[0016] The rotating shaft 2 is inserted into the main body 11. In the illustrated example, the main body 11 is formed in a cylindrical shape corresponding to the first end 2a of the rotating shaft 2, which is cylindrical as a whole. Hereinafter, the radial direction of a circle centered on the axis 11X of the main body 11 will be referred to as the radial direction of the main body 11. Also, the circumferential direction of a circle centered on the axis 11X of the main body 11 will be referred to as the circumferential direction of the main body 11. When the jig 10 is attached to the rotating shaft 2, the axis 11X of the main body 11 and the central axis 2X of the rotating shaft 2 coincide with each other.

[0017] The key 11k protrudes radially inward from the inner circumferential surface of the main body 11. In the illustrated example, the key 11k also protrudes radially outward from the outer circumferential surface of the main body 11. The key 11k is fixed to the main body 11. The key 11k engages with a key groove 2k of the rotating shaft 2, thereby preventing the main body 11 from rotating around the rotating shaft 2. The key 11k extends between the first end 11a and the second end 11b along the axis 11X of the main body 11. The key 11k can be engaged with the key groove 2k of the rotating shaft 2 whether the rotating shaft 2 is inserted into the main body 11 from the second end 11b side of the main body 11 as shown in FIG. 3 or the first end 11a side of the main body 11 as shown in FIG. 4. When the jig 10 is connected as shown in FIG. 4, the jig 10 can also be used as a hand-winding handle.

[0018] The flange portion 20 extends radially outward from the end face or outer peripheral surface of the main body portion 11 at the second end 11b of the main body portion 11. The flange portion 20 is formed in an annular shape. In the illustrated example, the flange portion 20 is formed in an annular plate shape. The flange portion 20 has a first surface 20a facing the first end 11a of the main body portion 11 and a second surface 20b opposite the first surface 20a. The flange portion 20 is fixed to the main body portion 11. In the illustrated example, the flange portion 20 is formed integrally with the main body portion 11. Hereinafter, the radial direction of a circle centered on the axis 20X of the flange portion 20 will be referred to as the radial direction of the flange portion 20. In addition, the circumferential direction of a circle centered on the axis 20X of the flange portion 20 will be referred to as the circumferential direction of the flange portion 20. The axis 20X of the flange portion 20 and the axis 11X of the main body portion 11 coincide with each other. Furthermore, when the jig 10 is attached to the rotating shaft 2, the axis 20X of the flange portion 20 and the central axis 2X of the rotating shaft 2 coincide with each other.

[0019] First through holes 21 are formed in the flange portion 20. The first through holes 21 penetrate the flange portion 20 in its thickness direction. In the illustrated example, a plurality of first through holes 21 are formed in the flange portion 20 and aligned in the circumferential direction of the main body portion 11.

[0020] The screws 28 fix the flange portion 20 to the frame 3 of the reducer 1. The screws 28 are inserted into the first through holes 21 of the flange portion 20 and threadedly engage with threaded holes 3h formed around the rotating shaft 2 of the frame 3, thereby fixing the flange portion 20 to the frame 3. By fixing the flange portion 20 to the frame 3, the main body 11 is also fixed to the frame 3, and the rotating shaft 2 inserted into the main body 11 cannot rotate with respect to the frame 3.

[0021] 5, the screw holes 3h of the frame 3 are formed to fix a cap 40 that covers the first end 2a of the rotating shaft 2 to the frame 3 during normal elevator operation. More specifically, screws 41 inserted into the cap 40 are threadedly engaged with the screw holes 3h to fix the cap 40 to the frame 3. By fixing the jig 10 to the frame 3 using the existing screw holes 3h of the frame 3, the rotating shaft 2 can be fixed to the frame 3 without requiring any design changes to the reducer 1.

[0022] The handle 30 includes a handle base 31. The handle base 31 extends radially outward from the outer circumferential surface of the main body 11 or the flange 20. In the illustrated example, the handle base 31 is formed separately from the main body 11 and the flange 20 and is detachably fixed to the main body 11 or the flange 20 with fasteners 35 such as screws. Because the handle base 31 is detachable from the main body 11 or the flange 20, the handle 30 can be removed from the main body 11 or the flange 20 to make the jig 10 compact. This makes the jig 10 easier to carry. Of course, the handle base 31 may not be detachable from the main body 11 or the flange 20. In this case, the handle base 31 may be formed integrally with the main body 11 or the flange 20.

[0023] Next, a method for fixing the rotating shaft 2 to the frame 3 using such a jig 10 will be described.

[0024] First, as shown in FIG. 6 , the first end 2a of the rotating shaft 2 of the reducer 1 is inserted into the main body 11 so that the flange portion 20 faces the frame 3 of the reducer 1 and the key 11k of the jig 10 engages with the key groove 2k formed in the first end 2a of the rotating shaft 2. This connects the rotating shaft 2 to the jig 10 so that it cannot rotate relative to the jig 10. Next, as shown in FIG. 7 , the jig 10 is rotated together with the rotating shaft 2 using the handle 30 so that the first through hole 21 of the flange portion 20 and the screw hole 3h of the frame 3 overlap when viewed in the direction along the central axis 2X of the rotating shaft 2. Next, a screw 28 is inserted through the first through hole 21 and screwed into the screw hole 3h of the frame 3. This fixes the jig 10 to the frame 3. As a result, the rotating shaft 2 is fixed to the frame 3.

[0025] It should be noted that various modifications can be made to the embodiment described above.

[0026] <Variation 1> For example, as shown in Figures 8 and 9, the handle base 31 may be formed with a second through-hole 32 for holding a screw. The second through-hole 32 penetrates the handle base 31 in the thickness direction of the handle base 31. This allows a screw to be inserted into the second through-hole 32 to be held. Note that the dimensions of the screw hole 3h of the frame 3 may vary depending on the reducer 1. By holding screws 28, 29 of different dimensions in the first through-hole 21 and the second through-hole 32, it is possible to select a screw from these screws 28, 29 that fits the dimensions of the screw hole 3h of the frame 3.

[0027] <Variation 2> Furthermore, the flange portion 20 may be formed separately from the main body portion 11. In this case, the flange portion 20 only needs to be connected to the main body portion 11 so as to be unable to rotate in the circumferential direction of the main body portion 11. In this case as well, by fixing the flange portion 20 to the frame 3 of the reducer 1, it is possible to prevent the main body portion 11 from rotating relative to the frame 3. As a result, it is also possible to prevent the rotating shaft 2 from rotating relative to the frame 3.

[0028] 10 and 11, the flange portion 20 is detachably connected to the main body portion 11. In the illustrated example, a plurality of protrusions 12 that protrude radially outward from the main body portion 11 are formed on the outer peripheral surface of the main body portion 11. The plurality of protrusions 12 are aligned in the circumferential direction of the main body portion 11. A plurality of recesses 22 are formed on the second surface 20b of the flange portion 20. Each recess 22 extends from the inner peripheral surface of the flange portion 20 in the radial direction of the flange portion 20. Each recess 22 is open at the inner peripheral surface of the flange portion 20 and the second surface 20b. Each recess 22 accommodates a protrusion 12 of the main body portion 11. The protrusions 12 of the main body portion 11 engage with the recesses 22 of the flange portion 20, making the flange portion 20 non-rotatable relative to the main body portion 11. In the illustrated example, the flange portion 20 covers the multiple protrusions 12 of the main body portion 11 in the direction from the first end 11a to the second end 11b of the main body portion 11. As a result, when the jig 10 is fixed to the frame 3, the protrusions 12 of the main body portion 11 are held between the flange portion 20 and the frame 3. As a result, the main body portion 11 is prevented from falling off the flange portion 20.

[0029] Because the flange portion 20 is formed separately from the main body portion 11, it is easy to design the jig 10 to match the dimensions of the rotating shaft 2. That is, only the main body portion 11 of the jig 10 (more specifically, only the inner dimensions of the main body portion 11) needs to be designed to match the dimensions of the rotating shaft 2. Also, because the flange portion 20 is detachably connected to the main body portion 11, the main body portion 11 can be replaced to match the dimensions of the rotating shaft 2. Furthermore, the jig 10 is compact and easy to carry.

[0030] When assembling the main body 11 to the flange 20, as shown in Fig. 12, the first end 11a of the main body 11 is inserted from the side of the second surface 20b of the flange 20, and the convex portion 12 of the main body 11 is fitted into the concave portion 22 of the flange 20. When removing the main body 11 from the flange 20, the main body 11 is pulled out from the side of the second surface 20b of the flange 20. Here, for clarity of illustration, the screws 28 are omitted from Figs. 10 to 12.

[0031] <Variation 3> 13 and 14, a cylindrical portion 25 into which the main body portion 11 is inserted is connected to the flange portion 20. The flange portion 20 is indirectly connected to the main body portion 11 via the cylindrical portion 25. The cylindrical portion 25 extends from the first surface 20a of the flange portion 20 in a direction along the axis 20X of the flange portion 20. The axis 25X of the cylindrical portion 25 coincides with the axis 20X of the flange portion 20. The cylindrical portion 25 is fixed to the flange portion 20. In the illustrated example, the cylindrical portion 25 is integrally formed with the flange portion 20. The cylindrical portion 25 is connected to the main body portion 11 so as to be unrotatable in the circumferential direction of the main body portion 11 relative to the main body portion 11. As a result, by fixing the flange portion 20 to the frame 3 of the reducer 1, rotation of the main body portion 11 relative to the frame 3 can be prevented. As a result, rotation of the rotating shaft 2 relative to the frame 3 can also be prevented.

[0032] In the illustrated example, the key 11k protrudes not only from the inner peripheral surface of the main body 11 but also from the outer peripheral surface of the main body 11. The cylindrical portion 25 has a key groove 25k that engages with the key 11k. Engagement of the key 11k with the key groove 25k of the cylindrical portion 25 prevents rotation of the cylindrical portion 25 relative to the main body 11. The cylindrical portion 25 also has a threaded hole 25h that penetrates the cylindrical portion 25 in its thickness direction (in the radial direction of a circle centered on the axis 25X of the cylindrical portion 25). By threading a screw 26 into the threaded hole 25h and pressing the tip of the screw 26 against the main body 11, movement of the cylindrical portion 25 relative to the main body 11 can be suppressed.

[0033] Because the cylindrical portion 25, to which the main body portion 11 can be connected, is connected to the flange portion 20, it is easy to design the jig 10 to match the dimensions of the rotating shaft 2 of the reducer 1. In other words, it is sufficient to design only the main body portion 11 of the jig 10 (more specifically, only the inner dimensions of the main body portion 11) to match the dimensions of the rotating shaft 2. Alternatively, the jig 10 can be made by connecting the flange portion 20 to a conventional hand-winding handle via the cylindrical portion 25.

[0034] In the illustrated example, the cylindrical portion 25 is detachably connected to the main body 11. This allows the main body 11 to be replaced to match the dimensions of the rotating shaft 2. Furthermore, because the flange portion 20 is detachable from the main body 11, the flange portion 20 can be removed from the main body 11 to make the jig 10 more compact. As a result, the jig 10 is easier to carry. Note that the screws 28 are not shown in Figures 13 and 14 for clarity. Furthermore, in the example shown in Figures 13 and 14, the handle 30 is connected to the main body 11.

[0035] <Variation 4> 15 and 16, the handle 30 may have a grip 33. In the illustrated example, the handle 30 includes a handle base 31 and the grip 33. The handle base 31 extends radially outward from the outer circumferential surface of the main body 11 or from the flange 20. The grip 33 extends from the handle base 31 in a direction intersecting the radial direction of the main body 11. The grip 33 extends from the handle base 31 in a direction from the second end 11b toward the first end 11a of the main body 11. In the illustrated example, the grip 33 is connected perpendicularly to the handle base 31. The inclusion of such a grip 33 in the handle 30 makes it easier to operate the handle 30. The handle base 31 may be detachably connected to the main body 11 or the flange 20. This allows the handle 30 to be detached from the main body 11 or the flange 20 to make the jig 10 more compact. This makes it easier to carry the jig 10. Furthermore, the handle 33 may be detachably connected to the handle base 31. This allows the handle 33 to be detached from the handle base 31 to make the jig 10 even more compact, making it even easier to carry the jig 10.

[0036] <Variation 5> 17, the jig 10 may have multiple handles 301, 302. In the illustrated example, the jig 10 includes a first handle 301 and a second handle 302. The first handle 301 and the second handle 302 each extend radially outward from the outer circumferential surface of the main body 11 or the flange 20 of the main body 11. When viewed in a direction along the axis 11X of the main body 11, the first handle 301 and the second handle 302 are connected to the main body 11 or the flange 20 at positions that are point-symmetric with respect to the axis 11X of the main body 11. Such a jig 10 allows the jig 10 to be easily rotated. In the illustrated example, each of the handles 301, 302 has a handle base 31 and a grip 33.

[0037] <Variation 6> 18, the jig 10 may fix the rotating shaft 2 to the frame 3 by abutting the grips 33 of the handles 30; 301, 302 against the frame 3 of the reducer 1 in the circumferential direction of the rotating shaft 2. In the illustrated example, the first surface 3a of the frame 3 has projections and recesses. The first surface 3a includes a surface 3s extending in the radial direction of the rotating shaft 2. The handles 33 are positioned on the handle base 31 so that, when viewed in the direction along the central axis 2X of the rotating shaft 2, a circular locus 33L of the handles 33 when the handles 30; 301, 302 are rotated around the central axis 2X intersects with the radially extending surface 3s.

[0038] Next, a method for fixing the rotating shaft 2 using the handle 33 will be described. First, the jig 10 is prepared. The jig 10 only needs to have a main body 11, a key 11k, and handles 30; 301, 302 including a handle base 31 and a handle 33. The jig 10 does not need to include the flange 20 and the screw 28.

[0039] Next, with the handle 33 facing the first surface 3a of the frame 3, the first end 2a of the rotating shaft 2 is inserted into the main body 11 so that the key 11k engages with the key groove 2k of the rotating shaft 2. This prevents the jig 10 from rotating relative to the rotating shaft 2.

[0040] Next, with the rotating shaft 2 inserted into the main body 11, the handles 30; 301, 302 are rotated together with the rotating shaft 2, and the grip 33 is brought into contact with the surface 3s extending in the radial direction of the frame 3. This prevents the jig 10 from rotating relative to the frame 3, and also prevents the rotating shaft 2 from rotating relative to the frame 3.

[0041] In addition, such a jig can also be used as a hand-winding handle by attaching it to the rotating shaft 2 in the opposite direction to that shown in Figure 18, as shown in Figure 19 (i.e., by attaching it to the rotating shaft 2 so that the handle 33 faces away from the frame 3).

[0042] The reducer rotating shaft fixing jig 10 according to the embodiment and its modified example described above is detachably attached to the rotating shaft 2 of the reducer 1 assembled in an elevator hoist to fix the rotating shaft 2 to the frame 3 of the reducer 1. The jig 10 includes a main body 11, a key 11k, a flange 20, a screw 28, and handles 30; 301, 302. The main body 11 is cylindrical, and the rotating shaft 2 is inserted therein. The key 11k protrudes from the inner peripheral surface of the main body 11 and engages with a key groove 2k formed in the rotating shaft 2. The flange 20 extends radially outward from the end face or outer peripheral surface of the main body 11 at one end of the main body 11. A first through hole 21 is formed in the flange 20, penetrating the flange 20 in its thickness direction. The screw 28 is inserted into the first through hole 21. The handles 30; 301, 302 extend radially outward from the outer circumferential surface of the main body 11 or from the flange 20. By using such a jig 10, the removal of the bearings, couplings 5, etc. attached to the rotating shaft 2 of the reducer 1 can be performed by one person, and the removal work can be made more efficient.

[0043] In the modified example described above, the handle 30; 301, 302 is formed with a second through-hole 32 for inserting and holding the screws 28, 29. In this case, the first through-hole 21 and the second through-hole 32 can hold screws 28, 29 of different dimensions, and it is possible to select a screw from these screws 28, 29 that matches the dimensions of the screw hole 3h of the frame 3. This further improves the efficiency of the removal work.

[0044] In the modified example described above, the flange portion 20 is formed separately from the main body portion 11. The flange portion 20 is connected to the main body portion 11 so as to be unable to rotate in the circumferential direction of the main body portion 11. In this case, too, by fixing the flange portion 20 to the frame 3 of the reducer 1, it is possible to prevent the rotating shaft 2 from rotating relative to the frame 3. Furthermore, in this case, it is easy to design the main body portion 11 to match the dimensions of the rotating shaft 2.

[0045] Furthermore, in this modified example, the flange portion 20 is detachably connected to the main body portion 11. In this case, the main body portion 11 can be replaced to match the dimensions of the rotating shaft 2. Also, the flange portion 20 can be detached from the main body portion 11 to make the jig 10 more compact.

[0046] In the modified example described above, the flange portion 20 is connected to a cylindrical portion 25 into which the main body portion 11 is inserted. The cylindrical portion 25 is connected to the main body portion 11 so as to be unable to rotate in the circumferential direction of the main body portion 11. In this case, too, by fixing the flange portion 20 to the frame 3 of the reducer 1, it is possible to prevent rotation of the rotating shaft 2 relative to the frame 3. Furthermore, in this case, it is easy to design the main body portion 11 to match the dimensions of the rotating shaft 2. Furthermore, in this case, the jig 10 can be produced by connecting the flange portion 20 to a conventional hand-winding handle via the cylindrical portion 25.

[0047] In the embodiment and its modified example described above, the handles 30; 301, 302 are detachably connected to the outer circumferential surface of the main body 11 or the flange portion 20. In this case, the handles 30; 301, 302 can be removed to make the jig 10 more compact.

[0048] In the modified examples described above, the handle 30; 301, 302 includes a handle base 31 that extends from the outer peripheral surface of the main body 11 or the flange 20 radially outward of the main body 11, and a grip 33 that extends from the handle base 31 in a direction intersecting the radial direction. The grip 33 is detachably connected to the handle base 31. The inclusion of the grip 33 in the handle 30; 301, 302 makes it easier to operate the handle 30; 301, 302. Furthermore, by detaching the grip 33 from the handle base 31, the jig 10 can be made more compact.

[0049] In the modified example described above, the jig 10 includes a first handle 301 and a second handle 302 that extend radially outward from the outer peripheral surface of the main body 11 or the flange 20 of the main body 11. When viewed in a direction along the axis 11X of the main body 11, the first handle 301 and the second handle 302 are connected to the main body 11 or the flange 20 at positions that are point-symmetric with respect to the axis 11X. In this case, the handles 301, 302 can be easily operated.

[0050] The above-described embodiment and its modified example of a method for fixing a rotating shaft for a reducer are methods for fixing a rotating shaft of a reducer assembled in an elevator hoist to a frame of the reducer. The method includes a step of preparing a jig 10. The jig 10 includes a cylindrical main body 11 into which a rotating shaft 2 is inserted, a key 11k that protrudes from the inner peripheral surface of the main body 11 and engages with a key groove 2k formed in the rotating shaft 2, and handles 30; 301, 302. The handles 30; 301, 302 each include a handle base 31 that extends radially outward from the outer peripheral surface of the main body 11, and a grip 33 that extends from the handle base 31 along the axis 11X of the main body 11. The above method also includes the steps of inserting the rotating shaft 2 into the main body 11 so that the handle 33 faces the frame 3 and the key 11k engages with the key groove 2k, and rotating the handles 30; 301, 302 together with the rotating shaft 2 while the rotating shaft 2 is inserted into the main body 11, so that the handle 33 abuts against the frame 3 in the circumferential direction of the rotating shaft 2. According to this method, the removal work of the bearings, couplings 5, etc. attached to the rotating shaft 2 of the reducer 1 can be performed by one person, and the removal work can be made more efficient.

[0051] Although the present invention has been described with reference to an embodiment and several modifications thereof, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These novel embodiments and modifications may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims. Furthermore, it is of course possible to combine these embodiments and modifications in part as appropriate within the spirit of the invention. [Explanation of symbols]

[0052] 1: Reducer, 2: Rotating shaft, 2a: First end, 2b: Second end, 2k: Keyway, 2X: Center axis, 3: Frame, 3a: First surface, 3b: Second surface, 3h: Screw hole, 3s: Surface, 5 : Coupling, 6: Gear puller, 7: Push screw, 7x: Center axis, 8: Holding part, 10: Jig, 11: Main body, 11a: First end, 11b: Second end, 11X: Axis, 11 k: key, 12: convex portion, 20: flange portion, 20a: first surface, 20b: second surface, 20X: axis, 21: first through-hole, 22: recess, 25: cylindrical portion, 25h: screw hole, 25k: key groove, 26, 28, 29: screw, 30, 301, 302: handle, 31: handle base, 32: second through-hole, 33: grip, 35: fixture, 40: cap, 41: screw

Claims

1. A reducer rotating shaft fixing jig that is detachably attached to a rotating shaft of a reducer assembled in an elevator hoist and fixes the rotating shaft to a frame of the reducer, a cylindrical main body into which the rotating shaft is inserted; a key that protrudes from an inner peripheral surface of the main body and engages with a key groove formed in the rotary shaft; a flange portion at one end of the main body portion, extending radially outward from an end face or an outer peripheral surface of the main body portion, the flange portion having a first through hole formed therein and penetrating in a thickness direction of the flange portion; a screw inserted into the first through hole; a handle extending radially outward from an outer circumferential surface of the main body or the flange; A jig equipped with:

2. The jig according to claim 1 , wherein the handle is formed with a second through-hole for inserting and holding the screw.

3. The flange portion is formed separately from the main body portion, The jig according to claim 1 , wherein the flange portion is connected to the main body portion so as to be unable to rotate in a circumferential direction of the main body portion relative to the main body portion.

4. The jig according to claim 3 , wherein the flange portion is detachably connected to the main body portion.

5. a cylindrical portion into which the main body portion is inserted is connected to the flange portion, The jig according to claim 1 , wherein the cylindrical portion is connected to the main body portion so as to be unable to rotate in a circumferential direction of the main body portion relative to the main body portion.

6. The jig according to claim 1 , wherein the handle is detachably connected to the outer circumferential surface of the main body or the flange.

7. The handle includes a handle base portion extending radially outward from an outer circumferential surface of the main body portion or the flange portion, and a grip portion extending from the handle base portion in a direction intersecting the radial direction, The jig of claim 1 , wherein the handle is removably connected to the handle base.

8. a first handle and a second handle extending radially outward from an outer circumferential surface of the main body or the flange portion, 2. The jig according to claim 1, wherein, when viewed in a direction along the axis of the main body, the first handle and the second handle are connected to the main body or the flange at positions that are point-symmetric with respect to the axis.

9. A method for fixing a rotating shaft of a reducer assembled in an elevator hoist to a frame of the reducer, comprising: a step of preparing a jig including a cylindrical main body into which the rotary shaft is inserted, a key protruding from an inner peripheral surface of the main body and engaging with a key groove formed in the rotary shaft, and a handle having a handle base extending radially outward from the outer peripheral surface of the main body and a grip extending from the handle base in a direction along the axis of the main body; inserting the rotating shaft into the body portion so that the handle faces the frame and the key engages with the key groove; a step of rotating the handle together with the rotation shaft while the rotation shaft is inserted into the main body portion, and bringing the grip into contact with the frame in a circumferential direction of the rotation shaft; A method for providing the above.

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