Hoisting machines and elevators

Abstract

To provide a hoisting machine and elevator that can increase braking force and be made smaller. [Solution] The hoisting machine is equipped with an electromagnetic brake device 15. The electromagnetic brake device 15 comprises a first brake disc 22, a second brake disc 23, a body 50, an intermediate plate 53, an electromagnetic core 30, an armature 32, an armature biasing member, a brake lining, and a guide pin 41. The body 50 has a first surface portion 51 and a second surface portion 52. The armature 32 has a pressing portion 33 that presses against the second brake disc 23. The brake lining clamps the first brake disc 22 and the second brake disc 23. At least one of the brake discs, the first brake disc 22 and the second brake disc 23, is supported so as to be movable along the axial direction of the drive shaft. The second surface portion 52 has a through hole 55 through which the pressing portion 33 is inserted.

Description

Technical Field

[0001] The present invention relates to a hoist and an elevator.

Background Art

[0002] Conventionally, an elevator includes a car, a counterweight, a rope connecting the car and the counterweight, and a hoist around which the rope is wound. The hoist has a drive unit, a rotating shaft connected to the drive unit, a sheave rotatably supported on the rotating shaft around which the rope is wound, and a brake disk connected to the sheave. Further, the hoist is provided with an electromagnetic brake device that brakes the sheave by braking the rotation of the brake disk.

[0003] Further, Patent Document 1 describes a technique including a brake disk spline-coupled to a rotating shaft, a fixed plate, a brake spring that presses an armature toward the fixed plate side, and an electromagnet that attracts the armature against the brake spring. In recent years, miniaturization of hoists has been demanded.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the technique described in Patent Document 1, when the hoist is miniaturized, it is necessary to reduce the diameter of the brake disk of the electromagnetic brake device. When the diameter of the brake disk is reduced, the braking torque generated in the brake disk when the brake disk is clamped also becomes small. As a result, in order to obtain a desired braking force, it is necessary to increase the magnetic adsorption force of the electromagnetic drive unit or the biasing force of the biasing member constituting the electromagnetic brake device, making it difficult to miniaturize the hoist.

[0006] The objective of this invention is to provide a hoisting machine and elevator that can increase braking force and be miniaturized, taking into consideration the above-mentioned problems. [Means for solving the problem]

[0007] To solve the above problems and achieve the objective, the hoisting machine comprises a sheave around which the elevator rope is wound, a motor having a drive shaft to which the sheave is attached, and an electromagnetic brake device that brakes the rotational movement of the drive shaft and the sheave. The electromagnetic brake device comprises a first brake disc, a second brake disc, a body, an intermediate plate, an electromagnetic core, an armature, an armature biasing member, a brake lining, and a guide pin. The first brake disc is mounted on the drive shaft and rotates with the drive shaft. The second brake disc is mounted on the drive shaft opposite the first brake disc and rotates with the drive shaft. The body covers a portion of the first and second brake discs and has a first surface portion facing the first brake disc and a second surface portion facing the second brake disc. An intermediate plate is positioned between the first and second surfaces and interposed between the first and second brake discs. The electromagnetic core is connected to the body via a connecting member. The armature is movably supported by the connecting member and has a pressing portion that presses against the second brake disc. An armature biasing member biases the armature away from the electromagnetic core. A brake lining is provided on the first surface portion, the intermediate plate and the pressing portion and clamps the first and second brake discs. Guide pins support the body and the intermediate plate so as to be movable along the axial direction of the drive shaft. At least one of the first and second brake discs is movably supported along the axial direction of the drive shaft. Furthermore, a through-hole is formed in the second surface through which the pressing part is inserted.

[0008] Furthermore, an elevator is equipped with a car that moves up and down within the hoistway, a rope connected to the car, and a sheave around which the rope is wound, and a hoisting machine that raises and lowers the car via the rope. The hoisting machine used is the one described above. [Effects of the Invention]

[0009] The hoisting machine and elevator with the above configuration can be made more compact while increasing braking force. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing an elevator according to an embodiment. [Figure 2] This is a side view showing a hoisting machine according to an embodiment. [Figure 3] This is a longitudinal cross-sectional view showing the brake of a hoisting machine according to an embodiment. [Figure 4] Figure 4A shows a cross-sectional view of the connection point of the electromagnetic drive unit in the brake of a hoisting machine according to an embodiment example, and Figure 4B shows a cross-sectional view of the electromagnetic drive unit. [Figure 5] This is a cross-sectional view showing the electromagnetic drive unit in the brake of a hoisting machine according to an embodiment. [Figure 6] This is a cross-sectional view showing the braking state of a hoisting machine, illustrating the operation of the brake according to an embodiment. [Figure 7] This is a cross-sectional view showing the operation of the brake of a hoisting machine according to an embodiment, specifically the release operation from the braking state. [Figure 8] This is a cross-sectional view showing the operation of the brake of a hoisting machine according to an embodiment, specifically the release operation from the braking state. [Figure 9] This is a cross-sectional view showing the operation of the brake of a hoisting machine according to an embodiment, specifically the release operation from the braking state. [Modes for carrying out the invention]

[0011] Hereinafter, the hoisting machine and elevator according to the embodiment example will be described with reference to FIGS. 1 to 9. In each figure, common members are denoted by the same reference numerals.

[0012] 1. Embodiment example 1-1. Configuration example of elevator First, the configuration of the elevator according to the embodiment example (hereinafter referred to as "this example") will be described with reference to FIG. 1. FIG. 1 is a schematic configuration diagram showing a configuration example of an elevator.

[0013] As shown in FIG. 1, the elevator 1 of this example is provided in a hoistway 110 formed in a building structure. The elevator 1 includes a car 120 that moves up and down in the hoistway 110 and carries people and luggage, a rope 130, a counterweight 140, and a hoisting machine 100. A machine room 160 is provided at the top of the hoistway 110.

[0014] The hoisting machine 100 is arranged in the machine room 160 and raises and lowers the car 120 by winding the rope 130. In the vicinity of the hoisting machine 100, a deflecting sheave 150 on which the rope 130 is mounted is provided.

[0015] A car 120 is attached to one axial end of the rope 130, and a counterweight 140 is attached to the other axial end of the rope 130. Therefore, the car 120 is connected to the counterweight 140 via the rope 130. Then, when the hoisting machine 10 operates, the car 120 moves up and down in the hoistway 110.

[0016] In this example, the configuration of the elevator 1 is not limited to the 1:1 roping elevator shown in FIG. 1, and various other elevators such as 2:1 roping elevators can be applied. Further, the hoisting machine 100 of this example described later can reduce the size of the entire device, and thus is suitable for an elevator in which the hoisting machine 100 is arranged in a pit at the lower part of the hoistway 110, such as a 2:1 roping elevator.

[0017] 1-2. Configuration Example of Hoisting Machine Next, the configuration of the hoisting machine will be described with reference to FIG. 2. FIG. 2 is a side view showing the hoisting machine 100.

[0018] As shown in FIG. 2, the hoisting machine 100 includes a sheave 10, a motor 11, a motor frame 14, and an electromagnetic brake device 15. The sheave 10 is attached to one end in the axial direction of the drive shaft 17 (see FIG. 3) of the motor 11. A rope 130 is wound around the sheave 10. When the motor 11 is driven, the sheave 10 is rotationally driven. The motor frame 14 covers the drive shaft 17. Further, an electromagnetic brake device 15 for braking the motor 11 is provided at the other end of the drive shaft 17 in the motor 11.

[0019] 1-3. Configuration Example of Electromagnetic Brake Device Next, the configuration of the electromagnetic brake device 15 will be described with reference to FIGS. 3 to 5B. FIG. 3 is a longitudinal sectional view showing the electromagnetic brake device 15. FIGS. 4A and 4B are views showing the electromagnetic drive unit 40 of the electromagnetic brake device 15 described later. FIG. 5 is a sectional view showing the electromagnetic drive unit 40 of the electromagnetic brake device 15. In FIG. 5, the first brake disk 22 and the second brake disk 23 are shown omitted.

[0020] As shown in FIGS. 3 to 5, the electromagnetic brake device 15 includes a disk cover 21, a first brake disk 22, a second brake disk 23, an electromagnetic drive unit 40, and a body 50. As shown in FIG. 3, the disk cover 21 is disposed at the other end 17a in the axial direction of the drive shaft 17. The disk cover 21 is formed in a hollow container shape. The first brake disk 22 and the second brake disk 23 are accommodated in the disk cover 21.

[0021] The first brake disc 22 and the second brake disc 23 are formed in a disc shape. A cylindrical portion 22a is formed in the radial center of the first brake disc 22. The other end 17a of the drive shaft 17 is press-fitted into the cylindrical hole of the cylindrical portion 22a. As a result, the first brake disc 22 rotates together with the drive shaft 17. Furthermore, the axial movement of the drive shaft 17 in the first brake disc 22 is restricted.

[0022] The second brake disc 23 is mounted on the drive shaft 17 together with the first brake disc 22. The second brake disc 23 is positioned at a distance from the first brake disc 22 and on the other end of the drive shaft 17 in the axial direction. Therefore, the braking surfaces of the first brake disc 22 and the second brake disc 23 face each other.

[0023] Furthermore, a cylindrical portion 23a is formed at the radial center of the second brake disc 23. In addition, a spline hub 26, which indicates a support portion, is provided at the location where the second brake disc 23 is attached to the other end 17a of the drive shaft 17. Engaging portions are formed on the inner wall of the cylindrical bore of the cylindrical portion 23a of the second brake disc 23, which engage with the spline hub 26. Therefore, the second brake disc 23 rotates together with the drive shaft 17. The second brake disc 23 is also supported by the spline hub 26 so as to be movable along the axial direction of the drive shaft 17.

[0024] Furthermore, a disc biasing spring 27, which represents a disc biasing member, is interposed between the cylindrical portion 22a of the first brake disc 22 and the cylindrical portion 23a of the second brake disc 23. The disc biasing spring 27 biases the second brake disc 23 in a direction away from the first brake disc 22. Although the example was explained using a disc biasing spring 27 as the disc biasing member, it is not limited to this, and various other elastic materials such as rubber can be used.

[0025] Furthermore, a disc retaining plate 24 is fixed to the end face of the other end 17a of the drive shaft 17. The disc retaining plate 24 is formed in a substantially circular disc shape. The radial outer edge of the disc retaining plate 24 faces the cylindrical portion 23a of the second brake disc 23. A disc retaining bolt 25 is provided on the outer edge of the disc retaining plate 24. The tip of the disc retaining bolt 25 abuts against the cylindrical portion 23a of the second brake disc 23. This prevents the second brake disc 23, which is biased by the disc biasing spring 27, from falling off the other end 17a of the drive shaft 17.

[0026] Then, when the electromagnetic drive unit 40, which will be described later, operates, the rotational movement of the first brake disc 22 and the second brake disc 23 is braked by the brake linings 54a, 54b, 54c, and 54d.

[0027] Next, the configuration of the electromagnetic drive unit 40 and the body 50 will be described with reference to Figures 4A to 5. As shown in Figure 4B, an opening 21a is formed in a portion of the radially outer peripheral edge of the first brake disc 22 and the second brake disc 23 in the disc cover 21. A portion of the peripheral edge of the first brake disc 22 and the second brake disc 23 is exposed through this opening 21a. The electromagnetic drive unit 40 and the body 50 are arranged in the opening 21a.

[0028] The body 50 is shaped to cover a portion of the peripheral edges of the first brake disc 22 and the second brake disc 23. The body 50 is movably supported by a guide pin 41 provided on the disc cover 21. One axial end of the guide pin 41 is fixed to a pin fixing portion 42 provided on the inner wall surface of the disc cover 21. The other axial end of the guide pin 41 is fixed to the edge of the opening 21a of the disc cover 21. The axial direction of the guide pin 41 is parallel to the axial direction of the drive shaft 17.

[0029] The body 50 has a first surface portion 51, a second surface portion 52 facing the first surface portion 51, and a connecting surface portion 59 connecting the first surface portion 51 and the second surface portion. An intermediate plate 53 is positioned between the first surface portion 51 and the second surface portion 52. The intermediate plate 53 is interposed between the first brake disc 22 and the second brake disc 23.

[0030] The first surface 51, the second surface 52, and the intermediate plate 53 each have through holes 51a, 52a, and 53a through which the guide pin 41 is inserted. The first surface 51 and the second surface 52 of the body 50 and the intermediate plate 53 are supported so as to be movable along the axial direction of the guide pin 41. Therefore, the first surface 51 and the second surface 52 of the body 50 and the intermediate plate 53 are supported so as to be movable along the axial direction of the drive shaft 17 by the guide pin 41.

[0031] Furthermore, the peripheral edge of the first brake disc 22 is interposed between the first surface portion 51 and the intermediate plate 53, and the peripheral edge of the second brake disc 23 is interposed between the intermediate plate 53 and the second surface portion 52 (see Figures 6 to 9). Therefore, the first surface portion 51 faces the first brake disc 22, and the second surface portion 52 faces the second brake disc 23.

[0032] Furthermore, a first body spring 56, which is a compression coil spring and is a first body biasing member, is interposed at the end of the first surface portion 51 and the end of the intermediate plate 53. A second body spring 57, which is a compression coil spring and is a second body biasing member, is interposed at the end of the second surface portion 52 and the end of the intermediate plate 53.

[0033] The first body spring 56 biases the intermediate plate 53 in a direction away from the first surface portion 51. The second body spring 57 biases the intermediate plate 53 in a direction away from the second surface portion 52. Therefore, in the normal state when the electromagnetic brake device 15 is not operating, the first surface portion 51 and the intermediate plate 53 face each other with a gap between them. Similarly, the second surface portion 52 and the intermediate plate 53 face each other with a gap between them.

[0034] Although the example described uses compression coil springs as the first and second body biasing members, the method is not limited to this. For example, rubber and various other elastic materials can be used.

[0035] A first brake lining 54a is fixed to one surface of the first surface portion 51 that faces the intermediate plate 53. A second brake lining 54b is fixed to one surface of the intermediate plate 53 that faces the first surface portion 51.

[0036] Furthermore, a through hole 55 is formed in the second surface portion 52. The pressing portion 33 of the electromagnetic drive unit 40, which will be described later, is inserted into the through hole 55. The pressing portion 33 faces the intermediate plate 53. In addition, a third brake lining 54c is fixed to the other surface of the intermediate plate 53 that faces the pressing portion 33. And a fourth brake lining 54d is fixed to one surface of the pressing portion 33 that faces the intermediate plate 53.

[0037] Furthermore, a mounting piece 58 is provided at the end of the second surface portion 52 opposite to the connecting surface portion 59. A floating bolt 61 is attached to the mounting piece 58. One end of the floating bolt 61 is fixed to the second surface portion 52, and the other end penetrates the disc cover 21. A floating spring 62 is interposed between the other end of the floating bolt 61 and the disc cover 21. The floating spring 62 biases the body 50 so that the inner wall surface of the first surface portion 51 approaches the first brake disc 22.

[0038] Next, the configuration of the electromagnetic drive unit 40 will be described. The electromagnetic drive unit 40 includes an electromagnetic core 31, an armature 32 facing the electromagnetic core 31, a pressing portion 33 provided on the armature 32, a connecting member 34 supporting the armature 32, and a biasing spring as shown in the attached figure.

[0039] The electromagnetic core 31 houses an electromagnetic coil (not shown). When a voltage is applied to the electromagnetic coil, the electromagnetic core 31 and the electromagnetic coil form an electromagnet. One side of the electromagnetic core 31 facing the body 50 becomes the magnetic attraction surface. The armature 32 is positioned opposite the magnetic attraction surface of the electromagnetic core 31. The armature 32 is positioned between the electromagnetic core 31 and the body 50.

[0040] Furthermore, a connecting member 34 is attached to the electromagnetic core 31. One end of the connecting member 34 is fixed to the electromagnetic core 31 via a mounting bolt. The other end of the connecting member 34 is fixed to the second surface 52 of the body 50 via a collar 35. The armature 32 is movably supported by the connecting member 34.

[0041] Furthermore, the connecting member 34 is provided with an armature biasing member that biases the armature 32 in a direction that moves it away from the electromagnetic core 31. The armature biasing member only needs to be located between the electromagnetic core 31 and the armature 32, and its location is not limited to the connecting member 34. In addition, various elastic materials such as compression coil springs and rubber can be used as the armature biasing member.

[0042] Furthermore, the biasing force of the armature biasing member is set to be greater than the combined biasing force of the disc biasing spring 27 and the first body spring 56.

[0043] The armature 32 is supported by a connecting member 34 so as to be able to move closer to and further away from the electromagnetic core 31. A pressing portion 33 is positioned on the other side of the armature 32 opposite to the side facing the electromagnetic core 31.

[0044] The pressing portion 33 protrudes from the other side of the armature 32 toward the body 50 and passes through the through hole 55 provided in the second surface portion 52. The tip of the pressing portion 33 opposite to the armature 32 faces the intermediate plate 53 of the body 50. The peripheral edge of the second brake disc 23 is interposed between the tip of the pressing portion 33 and the intermediate plate 53. The fourth brake lining 54d is fixed to the tip of the pressing portion 33.

[0045] Furthermore, a stopper plate 32a is provided on the outer edge of the armature 32. The stopper plate 32a faces the inner wall surface of the outer edge of the opening 21a of the disc cover 21. A stopper pin 37 is provided on the disc cover 21 at the location facing the stopper plate 32a. The tip of the stopper pin 37 faces the stopper plate 32a. Also, when the armature 32 moves in a direction approaching the electromagnetic core 31, the stopper plate 32a comes into contact with the stopper pin 37.

[0046] 2. Example of electromagnetic brake device operation Next, an example of the operation of the electromagnetic brake device 15 having the above-described configuration will be explained with reference to Figures 6 to 9. Figure 6 shows the operation of the electromagnetic brake device 15 and is a cross-sectional view showing the braking state.

[0047] First, when the hoisting machine 100 (see Figures 1 and 2) is stopped, no voltage is applied to the electromagnetic coil of the electromagnetic core 31, and the magnetism of the electromagnetic coil and the electromagnetic core 31 is erased. Also, the armature 32 is biased in a direction away from the electromagnetic core 31 by the armature biasing member.

[0048] Therefore, as shown in Figure 6, the pressing portion 33 is pressed against the second brake disc 23. The second brake disc 23 is pressed against the intermediate plate 53 of the body 50 by the pressing portion 33. Furthermore, the intermediate plate 53 moves together with the second brake disc 23 in a direction approaching the first surface portion 51, against the biasing force of the first body spring 56. Also, the second brake disc 23 moves in a direction approaching the first brake disc 22, against the biasing force of the disc biasing spring 27.

[0049] Furthermore, as the second brake disc 23 approaches the first brake disc 22, the movement of the pressing portion 33 and the armature 32 away from the electromagnetic core 31, that is, to one side in the axial direction of the drive shaft 17 (see Figure 3), is stopped. Note that the armature biasing member retains a biasing force in the direction that separates the electromagnetic core 31 and the armature 32.

[0050] Therefore, the electromagnetic core 31 is biased by the armature biasing member to move away from the armature 32, and moves away from the first brake disc 22 and the second brake disc 23. Then, together with the electromagnetic core 31 of the body 50 which is connected to the electromagnetic core 31 via the connecting member 34, it moves to the other side in the axial direction of the drive shaft 17 (see Figure 3). As a result, the first surface portion 51 of the body 50 is pressed against the first brake disc 22.

[0051] As a result, the first brake disc 22 is held between the first brake lining 54a provided on the first surface portion 51 and the second brake lining 54b provided on the intermediate plate 53. Similarly, the second brake disc 23 is held between the third brake lining 54c provided on the intermediate plate 53 and the fourth brake lining 54d provided on the pressing portion 33. Therefore, the rotational movement of the first brake disc 22 and the second brake disc 23 is braked by the electromagnetic brake device 15. Consequently, the rotational movement of the drive shaft 17 and the sheave 10 to which the first brake disc 22 and the second brake disc 23 are connected is braked by the electromagnetic brake device 15.

[0052] In the hoisting machine 100 of this example, the electromagnetic brake device 15 has multiple brake discs, a first brake disc 22 and a second brake disc 23. Therefore, when the first brake disc 22 and the second brake disc 23 are clamped together, the braking torque generated on the first brake disc 22 and the second brake disc 23 is equal to the size of two brake discs combined. This makes it possible to increase the braking force when the electromagnetic brake device 15 is operated without increasing the diameter of the first brake disc 22 and the second brake disc 23.

[0053] Furthermore, by increasing the braking force of the electromagnetic brake device 15, the clamping force between the first brake disc 22 and the second brake disc 23 can also be reduced. This makes it possible to reduce the biasing force of the armature biasing member constituting the electromagnetic drive unit 40, thereby enabling miniaturization of the electromagnetic drive unit 40. As a result, it becomes possible to miniaturize the entire hoisting machine 100.

[0054] Next, referring to Figures 6 to 9, the operation from the braking state to the brake release state will be explained. Figures 7 to 9 show the operation of the electromagnetic brake device 15 of the hoisting machine 100, and are cross-sectional views showing the release operation from the braking state.

[0055] When the hoisting machine 100 is in operation, a predetermined voltage is applied to the electromagnetic coil of the electromagnetic drive unit 40, and the electromagnetic core 31 is energized. As a result, an electromagnetic attractive force exceeding the biasing force of the armature biasing member is applied to the electromagnetic core 31. Therefore, as shown in Figure 7, the armature 32 is attracted to the magnetic attraction surface of the electromagnetic core 31 against the biasing force of the armature biasing spring. Then, as the armature 32 moves in the direction approaching the electromagnetic core 31, that is, to the other side in the axial direction of the drive shaft 17 (see Figure 3), the fourth brake lining 54d provided on the pressing part 33 moves away from the second brake disc 23.

[0056] Furthermore, when the armature 32 moves a predetermined distance in the direction approaching the electromagnetic core 31, the stopper plate 32a of the armature 32 comes into contact with the stopper pin 37. This stops the armature 32 from moving in the direction approaching the electromagnetic core 31.

[0057] A gap still exists between the armature 32 and the magnetic attraction surface of the electromagnetic core 31. The electromagnetic attraction force of the electromagnetic core 31 and electromagnetic coil continues to act on the armature 32. However, the movement of the armature 32 is restricted by the stopper pin 37. Therefore, the electromagnetic attraction force generated in the electromagnetic core 31 and electromagnetic coil acts on the electromagnetic core 31, causing the electromagnetic core 31 to move toward the armature 32, that is, toward one side in the axial direction of the drive shaft 17 (see Figure 3). Also, as shown in Figure 8, the body 50, which is connected to the electromagnetic core 31 via the connecting member 34, also moves toward one side in the axial direction of the drive shaft 17 (see Figure 3) together with the electromagnetic core 31. As a result, the first surface portion 51 of the body 50 moves away from the first brake disc 22.

[0058] Furthermore, as the pressing portion 33 moves away from the second brake disc 23, the force acting on the intermediate plate 53 of the body 50 via the second brake disc 23 also decreases. As a result, as shown in Figure 9, the intermediate plate 53 is biased by the first body spring 56 and moves in a direction away from the first brake disc 22. A second body spring 57 is positioned between the intermediate plate 53 and the second surface portion 52. Therefore, contact between the intermediate plate 53 and the second brake disc 23 can be suppressed.

[0059] Furthermore, as the electromagnetic core 31 moves, the second brake disc 23 also moves away from the first brake disc 22 by the disc biasing spring 27, returning to the initial position shown in Figure 3.

[0060] As a result, as shown in Figure 9, the magnetic attraction surface of the electromagnetic core 31 and the armature 32 come into contact. Consequently, the first brake lining 54a and the second brake lining 54b move away from the first brake disc 22, and the third brake lining 54c and the fourth brake lining 54d move away from the second brake disc 23. Then, the braking of the first brake disc 22, the second brake disc 23, the drive shaft 17, and the sheave 10 by the electromagnetic brake device 15 is released. This completes the operation of the electromagnetic brake device 15.

[0061] As described above, by providing two brake discs 22 and 23, the braking force when the electromagnetic brake device 15 is activated is increased, and the biasing force of the armature biasing member constituting the electromagnetic drive unit 40 is reduced. Therefore, the magnetic attraction force of the electromagnetic core 31 that resists the biasing force of the armature biasing member when the brake is released can also be reduced. As a result, it becomes possible to miniaturize the electromagnetic drive unit 40 and the hoisting machine 100 as a whole.

[0062] It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the spirit of the invention as described in the claims.

[0063] In the above-described embodiment, an example was given in which the second brake disc 23 of the first brake disc 22 is supported so as to be axially movable with respect to the drive shaft 17, but the invention is not limited to this. For example, the axial movement of the second brake disc 23 may be restricted, and the first brake disc 22 may be supported so as to be movable along the axial direction. In other words, it is sufficient that at least one of the brake discs, the first brake disc 22 and the second brake disc 23, is supported so as to be movable along the axial direction of the drive shaft 17. In addition, both the first brake disc 22 and the second brake disc 23 may be supported so as to be movable along the axial direction of the drive shaft 17.

[0064] Furthermore, in the above-described embodiment, the number of brake discs provided in the electromagnetic brake device 15 was set to two, but the number of brake discs is not limited to two. In other words, the number of brake discs constituting the electromagnetic brake device may be three or more.

[0065] In this specification, although terms such as "parallel" and "orthogonal" are used, these do not mean only strictly "parallel" and "orthogonal," but may also refer to states that are "approximately parallel" or "approximately orthogonal," which include "parallel" and "orthogonal" and are within a range in which they can perform their functions. [Explanation of Symbols]

[0066] 1...Elevator, 10...Sheave, 11...Motor, 14...Motor frame, 15...Electromagnetic brake device, 17...Drive shaft, 17a...Other end, 21...Disc cover, 21a...Opening, 22...First brake disc, 22a...Cylinder section, 23...Second brake disc, 23a...Cylinder section, 24...Disc retaining plate, 25...Disc retaining bolt, 26...Spline hub (support section), 27...Disc biasing spring (disc biasing member), 31...Electromagnetic core, 32...Armature, 32a...Stopper plate, 33...Pressing section, 34...Connecting member, 35...Collar, 37...Stopper pin, 40...Electromagnetic drive section, 41...Guide pin, 42...Pin fixing section, 50...Body, 51...First surface section, 51a...Through hole, 52...Second surface section, 53...Intermediate plate, 54a...First brake lining, 54b...Second brake lining, 54c...Third brake lining, 54d...Fourth brake lining, 55...Through hole, 56...First body spring (first body biasing member), 57...Second body spring (second body biasing member), 58...Mounting piece, 59...Connecting surface section, 61...Floating bolt, 62...Floating spring, 100...Hoisting machine, 110...Elevator shaft, 120...Elevator car, 130...Rope, 160...Machine room

Claims

1. The ropes of the elevator are wrapped around a shear, A motor having a drive shaft to which the aforementioned sheave is attached, It comprises an electromagnetic brake device for braking the rotational movement of the drive shaft and the sheave, The aforementioned electromagnetic brake device, A first brake disc is attached to the drive shaft and rotates together with the drive shaft, A second brake disc is mounted on the drive shaft opposite to the first brake disc and rotates together with the drive shaft, A body that covers a portion of the first brake disc and the second brake disc, and has a first surface portion facing the first brake disc and a second surface portion facing the second brake disc, An intermediate plate is positioned between the first surface portion and the second surface portion and interposed between the first brake disc and the second brake disc, An electromagnetic core connected to the body via a connecting member, An armature is movably supported by the connecting member and has a pressing portion that presses against the second brake disc, An armature biasing member that biases the armature in a direction that moves it away from the electromagnetic core, A brake lining provided on the first surface, the intermediate plate, and the pressing portion, which sandwiches the first brake disc and the second brake disc, A guide pin supports the body and the intermediate plate so that they can move along the axial direction of the drive shaft, Equipped with, At least one of the first brake disc and the second brake disc is supported so as to be movable along the axial direction of the drive shaft. The second surface portion has a through hole through which the pressing portion is inserted. Hoisting machine.

2. The system includes a disc biasing member provided between the first brake disc and the second brake disc, which biases the first brake disc and the second brake disc in a direction that moves them apart from each other. The hoisting machine according to claim 1.

3. A first body biasing member is provided between the first surface and the intermediate plate, and biases the intermediate plate in a direction that moves it away from the first surface. The device comprises a second body biasing member provided between the second surface and the intermediate plate, which biases the intermediate plate in a direction that moves it away from the second surface. The hoisting machine according to claim 1.

4. A car that moves up and down within the elevator shaft, The rope connected to the aforementioned elevator car, The vehicle comprises a hoisting machine having a sheave around which the rope is wound, and which raises and lowers the elevator car via the rope, The aforementioned hoisting machine is, A rope wheel around which the aforementioned rope is wound, A motor having a drive shaft to which the aforementioned sheave is attached, It comprises an electromagnetic brake device for braking the rotational movement of the drive shaft and the sheave, The aforementioned electromagnetic brake device, A first brake disc is attached to the drive shaft and rotates together with the drive shaft, A second brake disc is mounted on the drive shaft opposite to the first brake disc and rotates together with the drive shaft, A body that covers a portion of the first brake disc and the second brake disc, and has a first surface portion facing the first brake disc and a second surface portion facing the second brake disc, An intermediate plate is positioned between the first surface portion and the second surface portion and interposed between the first brake disc and the second brake disc, An electromagnetic core connected to the body via a connecting member, An armature is movably supported by the connecting member and has a pressing portion that presses against the second brake disc, An armature biasing member that biases the armature in a direction that moves it away from the electromagnetic core, A brake lining provided on the first surface, the intermediate plate, and the pressing portion, which sandwiches the first brake disc and the second brake disc, A guide pin supports the body and the intermediate plate so that they can move along the axial direction of the drive shaft, Equipped with, At least one of the first brake disc and the second brake disc is supported so as to be movable along the axial direction of the drive shaft. The second surface portion has a through hole through which the pressing portion is inserted. Elevator.

Images