Elevator hoisting machine

Abstract

The invention provides a hoisting machine of an elevator capable of reducing a work space required for replacing a sheave. The hoisting machine of the elevator is provided with a sheave support body (3) having a first rotation portion (802) having an outer peripheral surface (806) formed in a cylindrical surface shape and a second rotation portion (803) having an outer peripheral surface (807) formed in a cylindrical surface shape, the first rotation portion and the second rotation portion being arranged adjacent to each other, a diameter (D1) of the outer peripheral surface of the first rotation portion being larger than a diameter (D2) of the outer peripheral surface of the second rotation portion, and a sheave (4) having a first fitting portion (403) and a second fitting portion (404), the first fitting portion being formed with a first hole (406) into which the first rotation portion is fitted, the second fitting portion being formed with a second hole (407) into which the second rotation portion is fitted, the outer peripheral surface of the first rotation portion and an inner peripheral surface of the first hole being in surface contact with each other, and the outer peripheral surface of the second rotation portion and an inner peripheral surface of the second hole being in surface contact with each other.

Description

Technical Field

[0001] This invention relates to a traction machine for an elevator. Background Technology

[0002] Previously, there were elevator traction machines known to mount the sheave to the sheave support body by embedding the sheave support body into the hole of the sheave (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-011140

[0006] A rope is wound around a sheave. The sheave has grooves for the rope to insert. Due to prolonged use, the grooves on the sheave of an elevator's traction machine wear down. When the grooves on the sheave are worn, the sheave needs to be replaced.

[0007] When replacing the sheave, the push bolt is positioned along the axis of the sheave support. By rotating the push bolt around its axis, the sheave moves relative to the sheave support along its axis while the push bolt presses against it. This removes the sheave from the sheave support.

[0008] However, with the increasing size of elevator traction machines, both the sheave support and the sheave itself become larger along the axis of the sheave support. This results in longer push bolts. Consequently, there is a challenge of increasing the working space required around the elevator traction machine for sheave replacement. Summary of the Invention

[0009] The present invention was made to solve the aforementioned problems, and its object is to provide an elevator traction machine that can reduce the working space required for changing sheaves.

[0010] The traction machine of the elevator of the present invention comprises: a rope sheave support having a first rotating portion having an outer peripheral surface formed in the shape of a cylinder and a second rotating portion having an outer peripheral surface formed in the shape of a cylinder, the first rotating portion and the second rotating portion being arranged adjacent to each other, the diameter of the outer peripheral surface of the first rotating portion being larger than the diameter of the outer peripheral surface of the second rotating portion; and a rope sheave having a first fitting portion and a second fitting portion, the first fitting portion having a first hole for the first rotating portion to be fitted into, the second fitting portion having a second hole for the second rotating portion to be fitted into, the outer peripheral surface of the first rotating portion being in surface contact with the inner peripheral surface of the first hole, and the outer peripheral surface of the second rotating portion being in surface contact with the inner peripheral surface of the second hole.

[0011] Invention Effects

[0012] The traction machine of the elevator according to the present invention can reduce the working space required for changing the sheaves. Attached Figure Description

[0013] Figure 1 This is a side view showing the traction machine of the elevator according to Embodiment 1.

[0014] Figure 2 It is shown Figure 1 A partial sectional view of the elevator's traction machine.

[0015] Figure 3 It is shown Figure 2 A cross-sectional view of the main components of the elevator's traction machine.

[0016] Figure 4 It is shown Figure 2 A cross-sectional view of the rope pulley mounting component.

[0017] Figure 5 It is shown Figure 2 A cross-sectional view of the rope pulley and disc.

[0018] Figure 6 This is a cross-sectional view showing the main part of the traction machine of the elevator in Embodiment 2.

[0019] Label Explanation

[0020] 1: Support platform; 2: Motor; 3: Sheave support body; 4: Sheave; 5: Disc; 6: Support frame; 7: Rotating shaft; 8: Sheave mounting component; 9: Push bolt; 10: Rotating shaft; 101: Shaft; 102: Sheave mounting part; 103: First rotating part; 104: Second rotating part; 105: Third rotating part; 106: Positioning part; 107: Outer peripheral surface; 108: Outer peripheral surface; 109: Outer peripheral surface; 110: Bolt Hole; 401: Through hole; 402: Rope groove; 403: First fitting part; 404: Second fitting part; 405: Third fitting part; 406: First hole; 407: Second hole; 408: Third hole; 801: Through hole; 802: First rotating part; 803: Second rotating part; 804: Third rotating part; 805: Positioning part; 806: Outer peripheral surface; 807: Outer peripheral surface; 808: Outer peripheral surface; 809: Bolt hole. Detailed Implementation

[0021] Implementation Method 1

[0022] Figure 1 This is a side view showing the traction machine of the elevator according to Embodiment 1. Figure 2 It is shown Figure 1A partial sectional view of the traction machine of the elevator. The traction machine of the elevator in Embodiment 1 includes a support platform 1, a motor 2, a sheave support body 3, a sheave 4, a disc 5, and a support frame 6. The sheave support body 3 has a rotating shaft 7 and a sheave mounting component 8.

[0023] Motor 2 is mounted on support platform 1. Motor 2 has a motor stator (not shown) and a motor rotor (not shown). By supplying current to motor 2 from the outside, the motor rotor rotates relative to the motor stator.

[0024] One end of the rotating shaft 7 is connected to the motor rotor of the motor 2. Therefore, by supplying current to the motor 2 from the outside, the rotating shaft 7 is rotated. Let the axis of the rotating shaft 7 be Lc. The rotating shaft 7 rotates around the axis Lc. The direction along the axis Lc of the rotating shaft 7 is taken as the axial direction. The direction along the radius of the circle centered on the axis Lc of the rotating shaft 7 in a plane orthogonal to the axis Lc of the rotating shaft 7 is taken as the radial direction. The direction along the circumference of the circle centered on the axis Lc of the rotating shaft 7 in a plane orthogonal to the axis Lc of the rotating shaft 7 is taken as the circumferential direction.

[0025] A through hole 801 is formed in the sheave mounting component 8. The through hole 801 extends through the sheave mounting component 8 along the axis Lc of the rotating shaft 7. The rotating shaft 7 is inserted into the through hole 801. Thus, the sheave mounting component 8 is fixed to the rotating shaft 7. By rotating the rotating shaft 7, the sheave mounting component 8 rotates. The sheave mounting component 8 rotates about the axis Lc of the rotating shaft 7.

[0026] A through hole 401 is formed in the pulley 4. The through hole 401 extends through the pulley 4 along the axis Lc of the rotation shaft 7. A pulley mounting component 8 is inserted into the through hole 401. Thus, the pulley 4 is fixed to the pulley mounting component 8. The pulley 4 rotates by rotating the pulley mounting component 8. The pulley 4 rotates about the axis Lc of the rotation shaft 7.

[0027] Multiple rope grooves 402 are formed in the sheave 4. Multiple ropes (not shown) are wound around the sheave 4 along the rope grooves 402. The ropes are inserted into the rope grooves 402. The rotation of the sheave 4 causes the ropes wound around it to move. The car (not shown) is suspended in the hoistway by the ropes. Therefore, the movement of the ropes causes the car to rise and fall in the hoistway.

[0028] Disc 5 is fixed to pulley 4. Therefore, the rotation of pulley 4 causes disc 5 to rotate. A braking device (not shown) is provided around disc 5. The braking device brakes the rotation of disc 5. The rotation of pulley 4 is braked by braking the rotation of disc 5.

[0029] The support frame 6 is placed on the support platform 1. The support frame 6 supports the other end of the rotating shaft 7 so that it can rotate. By supporting the other end of the rotating shaft 7 with the support frame 6, the rotation of the rotating shaft 7 about the axis Lc is stabilized.

[0030] Figure 3 It is shown Figure 2 A cross-sectional view of the main components of the elevator's traction machine. Figure 4 It is shown Figure 2 A cross-sectional view of the rope pulley mounting component 8. Figure 5 It is shown Figure 2 A cross-sectional view of the pulley 4 and the disc 5. The pulley mounting component 8 has a first rotating part 802, a second rotating part 803, a third rotating part 804, and a positioning part 805.

[0031] The first rotating part 802 is formed in a cylindrical shape. The outer peripheral surface 806 of the first rotating part 802 is cylindrical in shape. Therefore, when viewed along the axis Lc of the rotation axis 7, the outer peripheral surface 806 of the first rotating part 802 is a circular shape centered on the axis Lc of the rotation axis 7.

[0032] The second rotating part 803 is formed in a cylindrical shape. The outer peripheral surface 807 of the second rotating part 803 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 7, the outer peripheral surface 807 of the second rotating part 803 is a circle centered on the axis Lc of the rotation axis 7.

[0033] The third rotating part 804 is formed in a cylindrical shape. The outer peripheral surface 808 of the third rotating part 804 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 7, the outer peripheral surface 808 of the third rotating part 804 is a circle centered on the axis Lc of the rotation axis 7.

[0034] The first rotating part 802, the second rotating part 803, and the third rotating part 804 are arranged along the axis Lc of the rotating shaft 7. Therefore, the first rotating part 802 and the second rotating part 803 are arranged adjacent to each other, and the second rotating part 803 and the third rotating part 804 are arranged adjacent to each other. In other words, the first rotating part 802, the second rotating part 803, and the third rotating part 804 are arranged continuously from the motor 2 side in the axial direction toward the support frame 6 side, in the order of the first rotating part 802, the second rotating part 803, and the third rotating part 804.

[0035] The direction in which the sheave 4 moves relative to the sheave mounting member 8 when it is removed from the sheave mounting member 8 is defined as the removal direction A of the sheave 4. The second rotating part 803 is arranged relative to the first rotating part 802 in the removal direction A of the sheave 4. The third rotating part 804 is arranged relative to the second rotating part 803 in the removal direction A of the sheave 4. In other words, the first rotating part 802, the second rotating part 803, and the third rotating part 804 are arranged consecutively in the removal direction A in the order of first rotating part 802, second rotating part 803, and third rotating part 804.

[0036] The first rotating part 802, the second rotating part 803 and the third rotating part 804 rotate about the axis Lc of the rotating shaft 7.

[0037] The first rotating part 802, the second rotating part 803, the third rotating part 804, and the positioning part 805 are integrally formed together. In other words, the rope pulley mounting component 8 is a single component made of the same material and integrally formed in a way that cannot be separated.

[0038] Through holes 801 are formed throughout the first rotating part 802, the second rotating part 803 and the third rotating part 804.

[0039] The diameter D1 of the outer peripheral surface 806 of the first rotating part 802 is larger than the diameter D2 of the outer peripheral surface 807 of the second rotating part 803. The diameter D2 of the outer peripheral surface 807 of the second rotating part 803 is larger than the diameter D3 of the outer peripheral surface 808 of the third rotating part 804. The first rotating part 802 is positioned closest to the motor 2 among the first, second, and third rotating parts 802 and 803. The third rotating part 804 is positioned closest to the support frame 6 among the first, second, and third rotating parts 804. Therefore, the outer diameter of the pulley mounting member 8 decreases sequentially from the motor 2 side towards the support frame 6 in the axial direction.

[0040] The diameter D1 of the outer peripheral surface 806 of the first rotating part 802 is larger than the diameter D2 of the outer peripheral surface 807 of the second rotating part 803, thereby forming a stepped part at the boundary between the first rotating part 802 and the second rotating part 803.

[0041] The diameter D2 of the outer peripheral surface 807 of the second rotating part 803 is larger than the diameter D3 of the outer peripheral surface 808 of the third rotating part 804, thereby forming a stepped part at the boundary between the second rotating part 803 and the third rotating part 804.

[0042] A positioning part 805 is provided on the first rotating part 802. The positioning part 805 is disposed on the portion of the first rotating part 802 opposite to the side of the second rotating part 803 in the axial direction. The positioning part 805 is configured to protrude radially outward from the first rotating part 802 toward the rotation axis 7.

[0043] The positioning part 805 restricts the movement of the rope pulley 4 relative to the first rotating part 802 in the direction along the axis of the rope pulley support 3, in other words, in the direction along the axis Lc of the rotation axis 7. By restricting the movement of the rope pulley 4 relative to the first rotating part 802, the movement of the rope pulley 4 relative to the rope pulley mounting part 8 is also restricted.

[0044] When the pulley 4 is in contact with the positioning part 805, the position of the pulley 4 relative to the pulley mounting part 8 is a preset position. Therefore, by bringing the pulley 4 into contact with the positioning part 805, the pulley 4 is positioned in the preset position.

[0045] A bolt hole 809 is formed in the positioning part 805, which extends through the positioning part 805 along the axis Lc of the rotating shaft 7. A push bolt 9 can be inserted into the bolt hole 809. The push bolt 9 is used when removing the sheave 4 from the sheave mounting part 8. Although in Figure 2 and Figure 3 One bolt hole 809 is shown, but in the positioning part 805, multiple bolt holes 809 are arranged in a circumferential direction on the rotating shaft 7.

[0046] The pulley 4 has a first engagement part 403, a second engagement part 404 and a third engagement part 405.

[0047] A first hole 406 is formed in the first fitting portion 403. The inner circumferential surface of the first hole 406 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 7, the inner circumferential surface of the first hole 406 is a circle centered on the axis Lc of the rotation axis 7.

[0048] A second hole 407 is formed in the second fitting portion 404. The inner circumferential surface of the second hole 407 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 7, the inner circumferential surface of the second hole 407 is a circle centered on the axis Lc of the rotation axis 7.

[0049] A third hole 408 is formed in the third fitting portion 405. The inner circumferential surface of the third hole 408 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 7, the inner circumferential surface of the third hole 408 is a circle centered on the axis Lc of the rotation axis 7.

[0050] The first fitting portion 403, the second fitting portion 404, and the third fitting portion 405 are arranged along the axis Lc of the rotation shaft 7. Therefore, the first fitting portion 403 and the second fitting portion 404 are arranged adjacent to each other, and the second fitting portion 404 and the third fitting portion 405 are arranged adjacent to each other. In other words, the first fitting portion 403, the second fitting portion 404, and the third fitting portion 405 are arranged continuously from the motor 2 side in the axial direction toward the support frame 6 side, in the order of the first fitting portion 403, the second fitting portion 404, and the third fitting portion 405.

[0051] The second fitting portion 404 is arranged relative to the first fitting portion 403 in the disassembly direction A of the pulley 4. The third fitting portion 405 is arranged relative to the second fitting portion 404 in the disassembly direction A of the pulley 4. In other words, the first fitting portion 403, the second fitting portion 404, and the third fitting portion 405 are arranged consecutively in the disassembly direction A in the order of the first fitting portion 403, the second fitting portion 404, and the third fitting portion 405.

[0052] The first fitting part 403, the second fitting part 404, and the third fitting part 405 are integrally formed together. In other words, the pulley 4 is a single component made of the same material and integrally formed in a way that cannot be separated.

[0053] Through hole 401 is formed throughout the first fitting portion 403, the second fitting portion 404, and the third fitting portion 405. Through hole 401 includes first hole 406, second hole 407, and third hole 408.

[0054] The diameter D4 of the first hole 406 in the first fitting part 403 is larger than the diameter D5 of the second hole 407 in the second fitting part 404. The diameter D5 of the second hole 407 in the second fitting part 404 is larger than the diameter D6 of the third hole 408 in the third fitting part 405. The first fitting part 403 is located closest to the motor 2 among the first fitting parts 403, second fitting parts 404, and third fitting parts 405. The third fitting part 405 is located closest to the support frame 6 among the first fitting parts 403, second fitting parts 404, and third fitting parts 405. Therefore, the inner diameter of the through hole 401 decreases sequentially from the motor 2 side in the axial direction toward the support frame 6 side.

[0055] The diameter D4 of the first hole 406 of the first fitting part 403 is larger than the diameter D5 of the second hole 407 of the second fitting part 404, thereby forming a stepped part at the boundary between the first fitting part 403 and the second fitting part 404.

[0056] The diameter D5 of the second hole 407 of the second fitting part 404 is larger than the diameter D6 of the third hole 408 of the third fitting part 405, thereby forming a stepped part at the boundary between the second fitting part 404 and the third fitting part 405.

[0057] A first rotating part 802 is inserted into the first hole 406 of the first fitting part 403. The outer peripheral surface 806 of the first rotating part 802 is in surface contact with the inner peripheral surface of the first hole 406 of the first fitting part 403.

[0058] A second rotating part 803 is inserted into the second hole 407 of the second fitting part 404. The outer peripheral surface 807 of the second rotating part 803 is in surface contact with the inner peripheral surface of the second hole 407 of the second fitting part 404.

[0059] A third rotating part 804 is inserted into the third hole 408 of the third fitting part 405. The outer peripheral surface 808 of the third rotating part 804 is in surface contact with the inner peripheral surface of the third hole 408 of the third fitting part 405.

[0060] The length of the area in which the outer peripheral surface 806 of the first rotating part 802 and the inner peripheral surface of the first hole 406 of the first fitting part 403 face each other, along the axis Lc of the rotation axis 7, is defined as L1. The length of the area in which the outer peripheral surface 807 of the second rotating part 803 and the inner peripheral surface of the second hole 407 of the second fitting part 404 face each other, along the axis Lc of the rotation axis 7, is defined as L2. The length of the area in which the outer peripheral surface 808 of the third rotating part 804 and the inner peripheral surface of the third hole 408 of the third fitting part 405 face each other, along the axis Lc of the rotation axis 7, is defined as L3.

[0061] Each of lengths L1, L2, and L3 can be freely set. In the traction machine of the elevator in Embodiment 1, each of lengths L1, L2, and L3 is the same as each other. Alternatively, any two of lengths L1, L2, and L3 can also be the same as each other. Furthermore, each of lengths L1, L2, and L3 can also be different from each other.

[0062] The pulley 4 is mounted to the pulley mounting member 8 by heat pressing or press-fitting. Therefore, friction is generated between the outer peripheral surface 806 of the first rotating part 802 and the inner peripheral surface of the first hole 406 of the first fitting part 403. Furthermore, friction is generated between the outer peripheral surface 807 of the second rotating part 803 and the inner peripheral surface of the second hole 407 of the second fitting part 404. Additionally, friction is generated between the outer peripheral surface 808 of the third rotating part 804 and the inner peripheral surface of the third hole 408 of the third fitting part 405. Thus, a force acts between the pulley 4 and the pulley mounting member 8, inhibiting the movement of the pulley 4 relative to the pulley mounting member 8 in the direction along the axis Lc of the rotation axis 7. This force acting between the pulley 4 and the pulley mounting member 8 is referred to as the fitting force.

[0063] The engaging force between the rope wheel mounting component 8 and the rope wheel 4 is the sum of the frictional force between the first rotating part 802 and the first engaging part 403, the frictional force between the second rotating part 803 and the second engaging part 404, and the frictional force between the third rotating part 804 and the third engaging part 405.

[0064] Next, the steps for removing the sheave 4 from the sheave mounting assembly 8 will be described. First, the end of the push bolt 9 is inserted into the bolt hole 809 of the positioning part 805. Then, the push bolt 9 is rotated about its axis. As a result, the push bolt 9 moves relative to the positioning part 805 in the direction along the axis Lc of the rotation axis 7. The direction of movement of the push bolt 9 is the disassembly direction A of the sheave 4 when removing it from the sheave mounting assembly 8.

[0065] By moving the push bolt 9 relative to the positioning part 805 in the direction along the axis Lc of the rotation shaft 7, the end of the push bolt 9 comes into contact with the rope wheel 4. With the end of the push bolt 9 in contact with the rope wheel 4, the push bolt 9 is further moved relative to the positioning part 805 in the direction along the axis Lc of the rotation shaft 7, thereby causing the push bolt 9 to push against the rope wheel 4.

[0066] The sheave 4 is pushed by the push bolt 9, thereby moving the sheave 4 relative to the sheave mounting part 8 in the disassembly direction A.

[0067] When the rope pulley 4 moves a distance L1 relative to the rope pulley mounting member 8, the engagement between the outer peripheral surface 806 of the first rotating part 802 and the inner peripheral surface of the first hole 406 of the first fitting part 403 is released. Furthermore, in this case, the rope pulley 4 moves a distance L2 relative to the rope pulley mounting member 8. Therefore, the engagement between the outer peripheral surface 807 of the second rotating part 803 and the inner peripheral surface of the second hole 407 of the second fitting part 404 is released. Furthermore, in this case, the rope pulley 4 moves a distance L3 relative to the rope pulley mounting member 8. Therefore, the engagement between the outer peripheral surface 808 of the third rotating part 804 and the inner peripheral surface of the third hole 408 of the third fitting part 405 is released.

[0068] Therefore, the engagement between the sheave mounting component 8 and the sheave 4 is released. Then, the sheave 4 is removed from the sheave mounting component 8. This completes the step of removing the sheave 4 from the sheave mounting component 8.

[0069] As explained above, in the traction machine of the elevator of Embodiment 1, the sheave mounting member 8 has a first rotating part 802, a second rotating part 803, and a third rotating part 804. The diameter D1 of the outer peripheral surface 806 of the first rotating part 802 is larger than the diameter D2 of the outer peripheral surface 807 of the second rotating part 803. The diameter D2 of the outer peripheral surface 807 of the second rotating part 803 is larger than the diameter D3 of the outer peripheral surface 808 of the third rotating part 804. Furthermore, in the traction machine of the elevator of Embodiment 1, the sheave 4 has a first fitting part 403, a second fitting part 404, and a third fitting part 405. The outer peripheral surface 806 of the first rotating part 802 is in surface contact with the inner peripheral surface of the first hole 406 of the first fitting part 403. The outer peripheral surface 807 of the second rotating part 803 is in surface contact with the inner peripheral surface of the second hole 407 of the second fitting part 404. The outer peripheral surface 808 of the third rotating part 804 and the inner peripheral surface of the third hole 408 of the third fitting part 405 are in surface contact with each other. According to this structure, the length of the push bolt 9 used when replacing the sheave 4 can be smaller than the length obtained by adding each of lengths L1, L2, and L3. Therefore, as... Figure 1 As shown, the working space S required to replace the pulley 4 can be reduced.

[0070] Furthermore, the sheave mounting member 8 has a positioning part 805. The positioning part 805 restricts the movement of the sheave 4 relative to the first rotating part 802 in the direction along the axis of the sheave mounting member 8. According to this structure, when the sheave 4 is mounted on the sheave mounting member 8, the position of the sheave 4 relative to the sheave mounting member 8 can be easily configured at a predetermined position.

[0071] Implementation Method 2

[0072] Figure 6 This is a cross-sectional view showing the main parts of the traction machine of the elevator according to Embodiment 2. In the traction machine of the elevator of Embodiment 2, the sheave support 3 has a rotating shaft 10.

[0073] The rotating shaft 10 has a shaft portion 101 and a sheave mounting portion 102 disposed at the axially oriented intermediate portion of the shaft portion 101. The shaft portion 101 and the sheave mounting portion 102 are integrally formed together. In other words, the rotating shaft 10 is a single component made of the same material and integrally formed in a manner that cannot be separated.

[0074] The sheave mounting part 102 has a first rotating part 103, a second rotating part 104, a third rotating part 105 and a positioning part 106.

[0075] The outer peripheral surface 107 of the first rotating part 103 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 10, the outer peripheral surface 107 of the first rotating part 103 is a circle centered on the axis Lc of the rotation axis 10.

[0076] The outer peripheral surface 108 of the second rotating part 104 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 10, the outer peripheral surface 108 of the second rotating part 104 is a circle centered on the axis Lc of the rotation axis 10.

[0077] The outer peripheral surface 109 of the third rotating part 105 is cylindrical. Therefore, when viewed along the axis Lc of the rotation axis 10, the outer peripheral surface 109 of the third rotating part 105 is a circle centered on the axis Lc of the rotation axis 10.

[0078] The first rotating part 103, the second rotating part 104, and the third rotating part 105 are arranged along the axis Lc of the rotation shaft 10. Therefore, the first rotating part 103 and the second rotating part 104 are arranged adjacent to each other, and the second rotating part 104 and the third rotating part 105 are arranged adjacent to each other. In other words, the first rotating part 103, the second rotating part 104, and the third rotating part 105 are arranged continuously from the motor 2 side in the axial direction toward the support frame 6 side, in the order of the first rotating part 103, the second rotating part 104, and the third rotating part 105.

[0079] The second rotating part 104 is arranged relative to the first rotating part 103 in the disassembly direction A of the pulley 4. The third rotating part 105 is arranged relative to the second rotating part 104 in the disassembly direction A of the pulley 4.

[0080] Each of the rotating parts in the first rotating part 103, the second rotating part 104, and the third rotating part 105 rotates around the axis Lc of the rotating shaft 10.

[0081] The diameter of the outer peripheral surface 107 of the first rotating part 103 is larger than the diameter of the outer peripheral surface 108 of the second rotating part 104. The diameter of the outer peripheral surface 108 of the second rotating part 104 is larger than the diameter of the outer peripheral surface 109 of the third rotating part 105. The first rotating part 103 is positioned closest to the motor 2 among the first, second, and third rotating parts 103. The third rotating part 105 is positioned closest to the support frame 6 among the first, second, and third rotating parts 103. Therefore, the outer diameter of the sheave mounting part 102 decreases sequentially from the motor 2 side towards the support frame 6 in the axial direction.

[0082] The diameter of the outer peripheral surface 107 of the first rotating part 103 is larger than the diameter of the outer peripheral surface 108 of the second rotating part 104, thereby forming a stepped portion at the boundary between the first rotating part 103 and the second rotating part 104.

[0083] The diameter of the outer peripheral surface 108 of the second rotating part 104 is larger than the diameter of the outer peripheral surface 109 of the third rotating part 105, thereby forming a stepped portion at the boundary between the second rotating part 104 and the third rotating part 105.

[0084] The other structures of the first rotating part 103 are the same as those of the first rotating part 802 of the traction machine of the elevator in Embodiment 1. The other structures of the second rotating part 104 are the same as those of the second rotating part 803 of the traction machine of the elevator in Embodiment 1. The other structures of the third rotating part 105 are the same as those of the third rotating part 804 of the traction machine of the elevator in Embodiment 1.

[0085] A positioning part 106 is provided on the first rotating part 103. The positioning part 106 is disposed on the portion of the first rotating part 103 opposite to the side of the second rotating part 104 in the axial direction. The positioning part 106 is configured to protrude radially outward from the first rotating part 103 toward the rotating shaft 10.

[0086] The positioning part 106 restricts the movement of the rope pulley 4 relative to the first rotating part 103 in the direction along the axis of the rope pulley support 3, in other words, in the direction along the axis Lc of the rotation axis 10. By restricting the movement of the rope pulley 4 relative to the first rotating part 103, the movement of the rope pulley 4 relative to the rope pulley mounting part 102 is also restricted.

[0087] When the pulley 4 is in contact with the positioning part 106, the position of the pulley 4 relative to the pulley mounting part 102 is a preset position. Therefore, by bringing the pulley 4 into contact with the positioning part 106, the pulley 4 is positioned in the preset position.

[0088] A bolt hole 110 is formed in the positioning part 106, which extends through the positioning part 106 along the axis Lc of the rotation shaft 10. A push bolt 9 can be inserted into the bolt hole 110. The push bolt 9 is used when removing the rope pulley 4 from the rope pulley mounting part 102.

[0089] The other structures of the positioning part 106 are the same as those of the positioning part 805 of the traction machine of the elevator in Embodiment 1.

[0090] A first rotating part 103 is inserted into the first hole 406 of the first fitting part 403. The outer peripheral surface 107 of the first rotating part 103 is in surface contact with the inner peripheral surface of the first hole 406 of the first fitting part 403.

[0091] A second rotating part 104 is inserted into the second hole 407 of the second fitting part 404. The outer peripheral surface 108 of the second rotating part 104 and the inner peripheral surface of the second hole 407 of the second fitting part 404 are in surface contact with each other.

[0092] A third rotating part 105 is inserted into the third hole 408 of the third fitting part 405. The outer peripheral surface 109 of the third rotating part 105 is in surface contact with the inner peripheral surface of the third hole 408 of the third fitting part 405.

[0093] The sheave 4 is installed in the sheave mounting part 102 by heat pressing. The other structures of the traction machine of the elevator in Embodiment 2 are the same as those of the traction machine of the elevator in Embodiment 1.

[0094] As explained above, in the traction machine of the elevator in Embodiment 2, the rotating shaft 10 has a shaft portion 101 and a sheave mounting portion 102. The sheave mounting portion 102 has a first rotating portion 103, a second rotating portion 104, and a third rotating portion 105. The diameter of the outer peripheral surface 107 of the first rotating portion 103 is larger than the diameter of the outer peripheral surface 108 of the second rotating portion 104. The diameter of the outer peripheral surface 108 of the second rotating portion 104 is larger than the diameter of the outer peripheral surface 109 of the third rotating portion 105. Furthermore, in the traction machine of the elevator in Embodiment 2, the sheave 4 has a first fitting portion 403, a second fitting portion 404, and a third fitting portion 405. The outer peripheral surface 107 of the first rotating portion 103 is in surface contact with the inner peripheral surface of the first hole 406 of the first fitting portion 403. The outer peripheral surface 108 of the second rotating part 104 is in surface contact with the inner peripheral surface of the second hole 407 of the second fitting part 404. The outer peripheral surface 109 of the third rotating part 105 is in surface contact with the inner peripheral surface of the third hole 408 of the third fitting part 405. According to this structure, similar to the traction machine of the elevator in Embodiment 1, the working space S required for changing the sheave 4 can be reduced.

[0095] Furthermore, in the traction machine of the elevator in each embodiment, the structure of the sheave support 3 having a first rotating part, a second rotating part, and a third rotating part has been described. However, any structure having multiple rotating parts is acceptable. In this case, the multiple rotating parts are arranged sequentially toward the disassembly direction A, and the outer diameter of the sheave support 3 decreases sequentially toward the disassembly direction A.

Claims

1. A traction machine for an elevator, comprising: A rope pulley support has a first rotating portion with an outer peripheral surface formed into a cylindrical shape and a second rotating portion with an outer peripheral surface formed into a cylindrical shape, the first rotating portion and the second rotating portion being arranged adjacent to each other, the diameter of the outer peripheral surface of the first rotating portion being larger than the diameter of the outer peripheral surface of the second rotating portion; and A rope pulley has a first fitting portion and a second fitting portion. The first fitting portion has a first hole for the first rotating portion to be inserted into, and the second fitting portion has a second hole for the second rotating portion to be inserted into. The outer peripheral surface of the first rotating portion is in surface contact with the inner peripheral surface of the first hole, and the outer peripheral surface of the second rotating portion is in surface contact with the inner peripheral surface of the second hole. The sheave support also has a positioning part, which is disposed on the first rotating part. The positioning part restricts the movement of the rope wheel relative to the first rotating part in the direction along the axis of the rope wheel support. The positioning part is formed with a bolt hole that extends through the positioning part in the direction along the axis of the rope wheel support. The bolt hole is used to insert a push bolt that pushes the rope wheel in the disassembly direction.

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