JP6505886B1 - Electromagnetic disc brake device for hoisting machine - Google Patents

Abstract

An electromagnetic disc brake device of a hoisting machine capable of easily moving a brake disc to a neutral position.
A hub 29 having a spline 30 on its outer peripheral surface and a spline 30 of the hub 29 mesh with a hub 30 having a spline 30 on its outer peripheral surface and rotates integrally with the hub 29 so that it can move in the axial direction of the rotary shaft 18 Brake disk 22, a friction plate 23 disposed in the moving direction of the brake disk 22, an armature 21 for pressing the brake disk 22 against the friction plate 23, and an electromagnet 20 for attracting the armature 21 away from the brake disk 22 . An elastic body is provided on the outer peripheral portion of the hub 29 between the brake disc 22 and the friction plate 23. The elastic body is compressed when the brake disc 22 is pressed, and elastically biases the brake disc 22 away from the friction plate 23 when the armature 21 is sucked.
[Selected figure] Figure 3

Description

  Embodiments of the present invention relate to an electromagnetic disc brake device used in a hoist for an elevator.

  A geared hoist for elevators comprises a brake disc interposed between an armature and a friction plate. The brake disc is axially movably mounted on a rotary shaft driven by the motor.

  Specifically, a cylindrical hub is coaxially fixed to the outer periphery of the rotation shaft. On the outer peripheral surface of the hub, splines are formed along the axial direction of the rotation shaft. The brake disc has a boss through which the rotation shaft passes, and the boss engages with the spline. By this meshing, the brake disc rotates following the rotation axis, and the brake disc can move in the axial direction of the rotation axis so as to approach or move away from the friction plate.

  According to the conventional electromagnetic disc brake device, the brake disc is pressed against the friction plate via the armature, and the brake disc is sandwiched between the armature and the friction plate. Thus, the braking force acts on the rotating shaft via the brake disc.

  On the other hand, when the armature is attracted by the electromagnet, the armature moves away from the brake disc, and the pressing of the brake disc against the friction plate is released. As a result, the braking force is eliminated, and the rotating shaft shifts to a rotatable state.

  In such an electromagnetic disc brake device, it is required that the brake disc smoothly moves in the axial direction of the rotation shaft with the spline as a guide. If the smooth movement of the brake disc is impaired, it may be possible for the brake disc to co-rotate with the rotating shaft while in contact with the friction plate, even when the armature is separated from the brake disc.

  As a countermeasure against this, conventionally, there is known an electromagnetic disc brake device in which the outer peripheral surface of the hub on which the spline is formed is formed in a tapered shape which becomes thinner as it proceeds from the friction plate in the direction of the armature.

  By adopting this configuration, when the armature moves away from the brake disk, the brake disk moves along the taper of the outer peripheral surface of the hub in a direction away from the friction plate, and a clearance is secured between the brake disk and the friction plate. it can.

JP, 2011-202705, A

  However, if the hub is tapered, it may move along the taper of the hub until the brake disc abuts the armature. If the brake disc is brought into contact with the rotating shaft while abutting against the armature, the contact between the brake disc and the armature will be worn out or heated, which adversely affects the performance of the electromagnetic disc brake system. Exert.

  Furthermore, as the rotating brake disc contacts the armature, a metallic noise can be generated.

  It is an object of the invention to provide a winding in which the brake disc can be easily moved to a neutral position away from both the friction plate and the armature, and the brake disc can be prevented from rotating while remaining in contact with the friction plate and the armature. An object of the present invention is to obtain an electromagnetic disc brake device of the upper machine.

  According to the embodiment, the electromagnetic disc brake device of the winding machine is coaxially provided on the rotary shaft driven by the electric motor and the outer periphery of the rotary shaft, and rotates following the rotary shaft, and the outer peripheral surface A hub having splines extending in the axial direction of the rotating shaft, and a brake rotatably supported integrally with the hub by meshing with the splines of the hub and supported by the hub so as to be movable in the axial direction of the rotating shaft. A disc, a friction plate disposed on one side along the moving direction of the brake disc, and a friction plate for receiving the brake disc, and a second side disposed on the other side along the moving direction of the brake disc; An armature elastically urged in a pressing direction, and a direction for moving the armature away from the brake disc It comprises an electromagnet for sucking, a.

An elastic body interposed between the brake disc and the friction plate, and another elastic body interposed between the armature and the brake disc are provided on an outer peripheral portion of the hub. The elastic body is compressed when the brake disc is pressed against the friction plate, and elastically biases the brake disc away from the friction plate when the armature is attracted to the electromagnet. The brake disc is held in a neutral position away from the armature and the friction plate. The other elastic body restricts the movement of the brake disc towards the armature when the brake disc reaches the neutral position.

It is a side view showing roughly the composition of the elevator which has a geared type hoist. It is a perspective view of a geared type hoist used in a 1st embodiment. In 1st Embodiment, it is sectional drawing of an electromagnetic disc brake apparatus which shows the state which the brake disc moved to the neutral position. In 1st Embodiment, it is sectional drawing of an electromagnetic disc brake apparatus which shows the state which the brake disc moved to the damping | braking position. In 2nd Embodiment, it is sectional drawing of the electromagnetic disc brake apparatus which shows the state which the brake disc moved to the neutral position. In 3rd Embodiment, it is sectional drawing of the electromagnetic disc brake apparatus which shows the state which the brake disc moved to the neutral position.

First Embodiment
Hereinafter, the first embodiment will be described with reference to FIGS. 1 to 4.

  FIG. 1 schematically shows a traction type elevator 1. As shown in FIG. 1, the elevator 1 includes a hoistway 2, a first guide rail 3, a second guide rail 4, a car 5, a counterweight 6, and a geared hoist 7 as main elements. ing.

  The hoistway 2 is provided in a building such as a high-rise building, for example, and extends in a straight line so as to stand up in the vertical direction. The first guide rail 3 and the second guide rail 4 are fixed to the wall of the hoistway 2 respectively.

  The car 5 is movably supported by the hoistway 2 via the first guide rail 3. The counterweight 6 is movably supported by the hoistway 2 via the second guide rail 4.

  The geared hoist 7 is installed in a machine room 8 at the upper end of the hoistway 2. A main rope 9 is wound around a traction sheave 10 of the geared hoist 7. The main rope 9 suspends the car 5 and the counterweight 6 to the hoistway 2 by 1: 1 roping.

  Therefore, by controlling the operation of the geared hoist 7 in the direction of winding up or unwinding the main rope 9, the car 5 and the counterweight 6 are driven along the hoistway 2 in a sliding manner.

  Furthermore, a compensating rope 11 is bridged between the bottom of the car 5 and the lower end of the counterweight 6. The compensating rope 11 hangs down from the car 5 and the counterweight 6 toward the bottom of the hoistway 2 and is wound around the compensating sheave 12 disposed at the bottom of the hoistway 2.

  On the other hand, FIG. 2 discloses the appearance of the geared hoist 7 installed in the machine room 8. As shown in FIG. 2, the geared hoist 7 includes a reduction gear case 15 on which a traction sheave 10 is supported, an electric motor 16 serving as a drive source of the traction sheave 10, and an electromagnetic disk for applying a braking force to the electric motor 16. The brake device 17 is provided as a main element.

  The reduction gear case 15 incorporates a gear type reduction mechanism (not shown) for reducing the rotation of the motor 16 and transmitting it to the traction sheave 10. The motor 16 is supported by the reduction gear case 15 at a position adjacent to the traction sheave 10. The rotor shaft of the motor 16 is coaxially connected to the rotating shaft 18. The rotation shaft 18 meshes with the reduction gear mechanism in the reduction gear case 15, and protrudes outside the reduction gear case 15 on the opposite side of the motor 16.

  The electromagnetic disc brake device 17 is supported by the reducer case 15 on the opposite side of the motor 16. FIG. 3 is a cross-sectional view of the electromagnetic disc brake device 17. As shown in FIGS. 2 and 3, the electromagnetic disc brake device 17 includes an electromagnet 20, an armature 21, a brake disc 22 and a friction plate 23 as main elements.

  The electromagnet 20 is configured of an annular yoke 24 and an electromagnetic coil 25 wound around the yoke 24. The yoke 24 is fixed to the outer surface of the reduction gear case 15, and the rotation shaft 18 passes through the center of the yoke 24. Furthermore, the yoke 24 has a flat attraction surface 24 a located on the opposite side of the reduction gear case 15 and an annular recess 24 b opened to the attraction surface 24 a, and the electromagnetic coil 25 is disposed in the recess 24 b. It is housed.

  The armature 21 is an annular element having an outer diameter equal to that of the yoke 24, and the rotation shaft 18 passes through the center of the armature 21. The armature 21 has a flat pressing surface 21 a on the opposite side of the yoke 24 and is supported by the yoke 24 via a plurality of bolts 26. The bolts 26 project from the suction surface 24 a of the yoke 24 in parallel to the rotation shaft 18 and are arranged at intervals in the circumferential direction of the yoke 24. The bolt 26 slidably penetrates the outer peripheral portion of the armature 21.

  Therefore, the armature 21 is held in a posture parallel to the suction surface 24 a of the yoke 24 and can be moved in the axial direction of the rotary shaft 18 so as to approach or move away from the suction surface 24 a using the bolt 26 as a guide. ing.

  Further, a plurality of compression coil springs 28 are interposed between the yoke 24 and the armature 21 in a compressed state. The compression coil springs 28 are spaced apart from each other in the circumferential direction of the armature 21, and elastically bias the armature 21 in a direction away from the suction surface 24a.

  As shown in FIG. 3, the brake disc 22 is supported at the tip of the rotary shaft 18 via a cylindrical hub 29. The hub 29 is an element that rotates integrally with the rotating shaft 18 and is coaxially fixed to the outer peripheral surface of the tip of the rotating shaft 18 via a key (not shown).

  The hub 29 has a small diameter portion 29a that fits inside the yoke 24 and the armature 21, and a large diameter portion 29b coaxially continuous with the small diameter portion 29a. The large diameter portion 29 b is smaller in diameter than the inner diameter of the armature 21 and protrudes from the small diameter portion 29 a to the opposite side of the yoke 24.

  The outer peripheral surface of the large diameter portion 29b of the hub 29 is formed in a cylindrical surface parallel to the central axis O1 of the rotating shaft 18, and the spline 30 is formed on the outer peripheral surface of the large diameter portion 29b. The splines 30 have spline grooves and spline teeth extending in the axial direction of the rotation shaft 18.

  The brake disc 22 has a boss portion 31 through which the large diameter portion 29 b of the hub 29 coaxially penetrates, and the boss portion 31 meshes with the spline 30. By this meshing, the brake disc 22 is supported on the hub 29 so as to be movable in the axial direction of the rotary shaft 18 while rotating following the rotary shaft 18.

  The outer peripheral portion of the brake disc 22 has a first side 22a facing the pressing surface 21a of the armature 21 and a second side 22b opposite to the first side 22a. An annular lining material 32 is attached to the first side 22 a and the second side 22 b of the brake disc 22.

  As shown in FIG. 3, the friction plate 23 is an annular element for receiving the brake disc 22 and has a flat friction surface 23 a facing the pressing surface 21 a of the armature 21. The friction plate 23 is immovably fixed to projecting ends of the plurality of bolts 26 via a plurality of nuts 33. By this fixing, the distance L between the friction surface 23a of the friction plate 23 and the suction surface 24a of the yoke 24 is kept constant, and between the friction surface 23a of the friction plate 23 and the pressing surface 21a of the armature 21. The brake disc 22 is intervened.

  In other words, the friction plate 23 is disposed on one side along the moving direction of the brake disc 22, and the armature 21 is disposed on the other side along the moving direction of the brake disc 22.

  FIG. 4 discloses a state in which the energization of the electromagnetic coil 25 of the electromagnet 20 is cut off. When energization to the electromagnetic coil 25 is cut off, the excitation of the electromagnet 20 is released, and the armature 21 receives the biasing force of the compression coil spring 28 as shown by the arrow in FIG. Advance toward the friction surface 23 a of the friction plate 23.

As a result, the pressing surface 21 a of the armature 21 abuts against the lining material 32 on the outer peripheral portion of the brake disc 22, and presses the brake disc 22 toward the friction plate 23. As a result, the brake disc 22 moves toward the friction plate 23 with the spline 30 as a guide, and the lining material 32 on the outer peripheral portion of the brake disc 22 is between the pressing surface 21a of the armature 21 and the friction surface 23a of the friction plate 23 Sandwiched between.
Therefore, a braking force is generated at the contact portion between the lining material 32 of the brake disc 22 and the pressing surface 21a of the armature 21 and at the contacting portion between the lining material 32 of the brake disc 22 and the friction surface 23a of the friction plate 23. Thus, the free rotation of the rotary shaft 18 is forcibly stopped via the brake disc 22.

  On the other hand, FIG. 3 discloses a state where energization of the electromagnetic coil 25 is started and the electromagnet 20 is excited. When the electromagnet 20 is excited, the armature 21 is attracted to the attraction surface 24 a of the yoke 24 against the biasing force of the compression coil spring 28.

  Thereby, as shown by the arrow in FIG. 3, the armature 21 moves in a direction away from the friction plate 23, and the pinching of the brake disc 22 between the armature 21 and the friction plate 23 is released. Therefore, the lining material 32 of the brake disc 22 separates from the pressing surface 21a of the armature 21 and the friction surface 23a of the friction plate 23, and the rotating shaft 18 shifts to a rotatable state.

  From this, the brake disc 22 is between the braking position P1 (FIG. 4) inserted between the friction plate 23 and the armature 21 and the neutral position P2 (FIG. 3) separated from the friction plate 23 and the armature 21. It is movable in the axial direction of the rotating shaft 18.

  According to the electromagnetic disk brake device 17 of the present embodiment, the O-ring 35 is attached to the outer peripheral surface of the large diameter portion 29 b of the hub 29. The O-ring 35 is an example of an elastic body, and is interposed between the hub 29 of the brake disc 22 and the friction plate 23.

  Furthermore, according to the present embodiment, the O-ring 35 is fitted in the fitting groove 36 formed on the outer peripheral surface of the large diameter portion 29 b of the hub 29. The fitting groove 36 is continuously formed in the circumferential direction of the large diameter portion 29 b so as to cross the spline 30. In a state where the O-ring 35 is fitted in the fitting groove 36, the outer peripheral portion which is a part of the O-ring 35 protrudes from the outer peripheral surface of the large diameter portion 29b, and It is in contact with the side surface of the boss 31.

  In the first embodiment, when the energization of the electromagnetic coil 25 of the electromagnet 20 is cut off, the brake disc 22 is pushed by the armature 21 in the direction approaching the friction plate 23, and the brake disc 22 moves to the braking position P1.

  At the braking position P1 shown in FIG. 4, the side surface of the boss portion 31 approaches the O-ring 35 fitted in the fitting groove 36 as the brake disc 22 moves. Therefore, when the electromagnetic disk brake device 17 is operated, the O-ring 35 is forcibly compressed by the side surface of the boss portion 31.

  When energization of the electromagnetic coil 25 of the electromagnet 20 is started, the armature 21 is attracted toward the suction surface 24 a of the yoke 24 and is separated from the brake disc 22. Therefore, the pinching of the brake disc 22 between the armature 21 and the friction plate 23 is released, and the electromagnetic disc brake device 17 is released.

  When the armature 21 separates from the brake disc 22, the force pressing the brake disc 22 against the friction plate 23 disappears, so the O-ring 35 compressed by the boss portion 31 of the brake disc 22 returns to its original shape. Therefore, a restoring force is applied to the boss 31 when the O-ring 35 elastically returns to the original shape, and as shown in FIG. 3, the brake disc 22 is forced from the braking position P1 to the neutral position P2. Pushed out.

  In the state where the brake disc 22 is moved to the neutral position P2, a gap G1 is secured between the lining material 32 of the brake disc 22 and the friction surface 23a of the friction plate 23.

  Furthermore, when the O-ring 35 returns to its original shape, the pushing out of the brake disc 22 by the O-ring 35 is canceled. Therefore, the brake disc 22 is not pushed toward the armature 21 endlessly, and when the brake disc 22 reaches the neutral position P2, the space between the lining material 32 of the brake disc 22 and the pressing surface 21a of the armature 21 The gap G2 is secured.

  According to the first embodiment, when the electromagnetic disc brake device 17 is released, the braking disc 22 is braked using the restoring force when the compressed O-ring 35 elastically returns to the original shape. It can be forcibly moved from P1 toward the neutral position P2. For this reason, it is possible to prevent the lining material 32 of the brake disc 22 from rotating with the rotary shaft 18 while in contact with the friction surface 23 a of the friction plate 23.

  Furthermore, since the lining material 32 of the brake disc 22 is separated from the pressing surface 21 a of the armature 21 when the O-ring 35 returns to the original shape, the lining material 32 of the brake disc 22 is on the pressing surface 21 a of the armature 21. It is possible to prevent the rotation along with the rotary shaft 18 while in contact.

  Therefore, the contact portion between the brake disc 22 and the friction plate 23 and the contact portion between the brake disc 22 and the armature 21 can be prevented from being worn out or generating heat, and the performance of the electromagnetic disc brake device 17 is excellent over a long period of time Can be maintained.

In addition, since the lining material 32 of the brake disc 22 is separated from both the friction plate 23 and the armature 21 when the electromagnetic disc brake device 17 is open, no metallic noise is generated.
Second Embodiment
FIG. 5 discloses a second embodiment. The second embodiment differs from the first embodiment in the configuration for holding the brake disc 22 in the neutral position P2. The other configuration of the electromagnetic disc brake device 17 is the same as that of the first embodiment. Therefore, in the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

  As shown in FIG. 5, another O-ring 41 is attached to the outer peripheral surface of the large diameter portion 29 b of the hub 29. Another O-ring 41 is an example of another elastic body, and is interposed between the hub 29 of the brake disc 22 and the armature 21.

  The other O-ring 41 is fitted in a fitting groove 42 formed on the outer peripheral surface of the large diameter portion 29 b of the hub 29. The fitting groove 42 is located on the opposite side of the fitting groove 36 into which the O-ring 35 is fitted with the boss 31 interposed therebetween, and is continuous in the circumferential direction of the large diameter portion 29 b so as to cross the spline 30. It is formed.

  In a state where another O-ring 41 is fitted into the fitting groove 42, the outer peripheral portion which is a part of the O-ring 41 is protruded from the outer peripheral surface of the large diameter portion 29b and the brake disc from the armature 21 side. It is in contact with the side surface of the boss portion 31 of 22.

  Accordingly, the boss portion 31 of the brake disc 22 is interposed between the two O-rings 35 and 41.

  In the second embodiment, when the energization of the electromagnetic coil 25 of the electromagnet 20 is cut off, the brake disc 22 is pushed by the armature 21 in a direction approaching the friction plate 23. Thereby, the brake disc 22 moves to the braking position P1.

  In the braking position P1, as with the first embodiment, the O-ring 35 fitted in the fitting groove 36 is forcibly compressed by the side surface of the boss portion 31 as the brake disc 22 moves. On the other hand, since the boss portion 31 moves away from the other O-ring 41, the other O-ring 41 maintains its original shape without being compressed.

  When energization of the electromagnetic coil 25 of the electromagnet 20 is started, the armature 21 is attracted to the attraction surface 24 a of the yoke 24 and is separated from the brake disc 22. As a result, the force pressing the brake disc 22 against the friction plate 23 disappears, so the O-ring 35 compressed by the boss 31 of the brake disc 22 returns to its original shape.

  As a result, the brake disc 22 is forcibly pushed out from the braking position P1 toward the neutral position P2 shown in FIG. 5 by the restoring force that the O-ring 35 tends to elastically return to the original shape.

  When the brake disc 22 reaches the neutral position P2, the side surface of the boss 31 of the brake disc 22 abuts on the other O-ring 41, and the movement of the brake disc 22 is restricted. In other words, the boss portion 31 shifts to a state in which it is sandwiched between the two O-rings 35 and 41.

  Therefore, the brake disc 22 is held at the neutral position P2 and a gap G1 is secured between the lining member 32 of the brake disc 22 and the friction surface 23a of the friction plate 23. The lining member 32 of the brake disc 22 and the armature 21 A gap G2 is secured between the pressing surface 21a and the pressing surface 21a.

  According to the second embodiment, in the state where the brake disc 22 is pushed out from the braking position P1 to the neutral position P2, another O-ring 41 abuts on the boss portion 31 of the brake disc 22 from the armature 21 side.

Therefore, when the electromagnetic disk brake device 17 is opened, the brake disk 22 can be prevented from being excessively pushed to the side of the armature 21, and the brake disk 22 can be accurately held at the neutral position P2. Therefore, the gap G2 can be reliably ensured between the lining material 32 of the brake disc 22 and the pressing surface 21a of the armature 21.
Third Embodiment
FIG. 6 discloses a third embodiment. The third embodiment differs from the second embodiment in the configuration for holding the brake disc 22 in the neutral position P2. The other configuration of the electromagnetic disc brake device 17 is the same as that of the second embodiment. Therefore, in the third embodiment, the same components as those of the second embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

  As shown in FIG. 6, the first holder 50 and the second holder 51 are attached to the hub 29. The first holder 50 is an annular element along the circumferential direction of the hub 29. The first holder 50 has a fixing portion 50a which covers the end face 29c of the large diameter portion 29b of the hub 29 and an upper portion of the spline 30 continuously to the fixing portion 50a. And the guide part 50b which overhangs.

  The fixing portion 50a is fixed to the end face 29c of the large diameter portion 29b by a plurality of screws (not shown). The guide portion 50 b faces the side surface of the boss portion 31 of the brake disc 22 from the side of the friction plate 23. Further, the guide portion 50 b has a fitting groove 50 c cut out so as to be continuously opened toward the side surface of the spline 30 and the boss portion 31.

  The first O-ring 52 is accommodated in the fitting groove 50c. The first O-ring 52 is an example of a first elastic body, and is in contact with the outer peripheral surface of the large diameter portion 29 b and the side surface of the boss portion 31 of the brake disc 22 from the friction plate 23 side.

  In the present embodiment, an annular first shim plate 53 is removably interposed between the fixing portion 50a of the first holder 50 and the end face 29c of the large diameter portion 29b. By changing the thickness of the first shim plate 53, the position of the first holder 50 along the axial direction of the rotating shaft 18 can be adjusted. Thereby, the degree of compression of the first O-ring 52 changes.

  The second holder 51 is a cylindrical element surrounding the hub 29 coaxially, and the fixing portion 51 a fitted to the outer peripheral surface of the small diameter portion 29 a of the hub 29 and the spline 30 continuously to the fixing portion 51 a. And a guide portion 51b protruding above.

  The fixing portion 51a is fixed to the outer peripheral surface of the small diameter portion 29a by a plurality of screws (not shown). The end face of the fixing portion 51a faces the step surface 29d located at the boundary between the small diameter portion 29a and the large diameter portion 29b. The guide portion 51 b faces the side surface of the boss portion 31 of the brake disc 22 from the side of the armature 21. Furthermore, the guide portion 51 b has a fitting groove 51 c cut out so as to be continuously opened toward the side surface of the spline 30 and the boss portion 31.

  The second O-ring 54 is accommodated in the fitting groove 51c. The second O-ring 54 is an example of a second elastic body, and is in contact with the outer peripheral surface of the large diameter portion 29 b and the side surface of the boss portion 31 of the brake disc 22 from the armature 21 side. For this reason, the boss portion 31 of the brake disc 22 is interposed between the first O-ring 52 and the second O-ring 54.

  In the present embodiment, an annular second shim plate 55 is removably interposed between the end face of the fixing portion 51 a of the second holder 51 and the step surface 29 d of the hub 29. By changing the thickness of the second shim plate 55, the position of the second holder 51 along the axial direction of the rotating shaft 18 can be adjusted. As a result, the degree of compression of the second O-ring 54 changes.

  In the third embodiment, when the energization of the electromagnetic coil 25 of the electromagnet 20 is cut off, the brake disc 22 is pushed by the armature 21 in the direction approaching the friction plate 23. Thereby, the brake disc 22 moves to the braking position P1.

  At the braking position P 1, the first O-ring 52 held in the first fitting groove 50 c of the first holder 50 is forcibly compressed by the side surface of the boss portion 31 in accordance with the movement of the brake disc 22. On the other hand, since the boss portion 31 moves away from the second O-ring 54 held in the second fitting groove 51c of the second holder 51, the second O-ring 54 has its original shape without being compressed. I keep it.

  When energization of the electromagnetic coil 25 of the electromagnet 20 is started, the armature 21 is attracted to the attraction surface 24 a of the yoke 24 and is separated from the brake disc 22. As a result, the force pressing the brake disc 22 against the friction plate 23 disappears, so the first O-ring 52 compressed by the boss 31 of the brake disc 22 returns to its original shape.

  As a result, the brake disc 22 is forcibly pushed from the braking position P1 toward the neutral position P2 shown in FIG. 6 by the restoring force by which the first O-ring 52 tends to elastically return to the original shape.

  When the brake disc 22 reaches the neutral position P2, the side surface of the boss portion 31 of the brake disc 22 abuts on the second O-ring 54, and the movement of the brake disc 22 is restricted. In other words, the boss portion 31 shifts to a state in which it is sandwiched between the first O-ring 52 and the second O-ring 54.

  Therefore, the brake disc 22 is held at the neutral position P2 and a gap G1 is secured between the lining member 32 of the brake disc 22 and the friction surface 23a of the friction plate 23. The lining member 32 of the brake disc 22 and the armature 21 A gap G2 is secured between the pressing surface 21a and the pressing surface 21a.

  According to the third embodiment, in a state where the brake disc 22 is pushed out from the braking position P1 to the neutral position P2, the second O-ring 54 abuts on the boss portion 31 of the brake disc 22 from the armature 21 side.

  Therefore, when the electromagnetic disk brake device 17 is opened, the brake disk 22 can be prevented from being excessively pushed to the side of the armature 21, and the brake disk 22 can be accurately held at the neutral position P2. Therefore, the gap G2 can be reliably formed between the lining material 32 of the brake disc 22 and the pressing surface 21a of the armature 21.

  Further, several kinds of first shim plates 53 and second shim plates 55 having different thicknesses are prepared in advance, and the first shim plates 53 and the second shim plates 55 of desired thickness are selected. The degree of compression of the first O-ring 52 and the second O-ring 54 can be freely adjusted.

  Therefore, the elastic force of the first O-ring 52 and the second O-ring 54 applied to the boss portion 31 of the brake disc 22 can be properly maintained, and the brake disc 22 is at the neutral position P2 or neutral position from the braking position P1. The movement of the brake disc 22 when moving from P2 to the braking position P1 is smooth.

  In addition, when the brake disc 22 reaches the neutral position P2, the boss portion 31 of the brake disc 22 can be firmly sandwiched between the first O-ring 52 and the second O-ring 54. Therefore, the brake disc 22 can be accurately held at the neutral position P2, and the gap G2 can be reliably secured between the lining material 32 of the brake disc 22 and the pressing surface 21a of the armature 21.

  In the third embodiment, the second holder 51, the second O-ring 54 and the second shim plate 55 are omitted, and the brake disc 22 is held at the neutral position P2 only by the first O-ring 52. You may do so.

  In the present embodiment, the elastic body is not specified to the O-ring. For example, a plurality of blocks made of a rubber-like elastic material may be arranged at intervals in the circumferential direction on the outer peripheral surface of the hub.

  Furthermore, a spring material such as a disc spring, a plate spring or a coil spring may be used as an elastic body, and the spring material may press the brake disc in a direction away from the friction plate or hold the brake disc in the neutral position. Good.

  In addition, the electromagnetic disk brake device is applicable not only to the geared hoist but also to, for example, a gearless hoist used in a machine roomless elevator.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  DESCRIPTION OF SYMBOLS 16 ... Electric motor, 17 ... Electromagnetic disc brake apparatus, 18 ... Rotation axis, 20 ... Electromagnet, 21 ... Armature, 22 ... Brake disc, 23 ... Friction plate, 29 ... Hub, 30 ... Spline, 31 ... Boss part, 35, 41 ... elastic body (O ring), 50 ... first holder, 51 ... second holder, 52 ... first elastic body (first O ring), 54 ... second elastic body (second O ring) ).

Claims (5)

A rotating shaft driven by a motor;
A hub coaxially provided on the outer periphery of the rotating shaft, and rotating following the rotating shaft and having a spline along the axial direction of the rotating shaft on the outer peripheral surface;
A brake disc integrally rotated with the hub by meshing with the spline of the hub and supported by the hub so as to be movable in the axial direction of the rotation shaft;
A friction plate disposed on one side along the moving direction of the brake disc for receiving the brake disc;
An armature, disposed on the other side along the moving direction of the brake disc, and elastically biased in a direction for pressing the brake disc against the friction plate;
And an electromagnet for attracting the armature away from the brake disc.
The electromagnetic disc brake device of a hoist wherein the brake disc is movable in the axial direction of the rotation shaft between the friction plate and the armature,
An elastic body interposed between the brake disc and the friction plate, and another elastic body interposed between the armature and the brake disc are provided on an outer peripheral portion of the hub.
The elastic body is compressed when the brake disc is pressed against the friction plate, and elastically biases the brake disc away from the friction plate when the armature is attracted to the electromagnet. Holding the brake disc in a neutral position away from the armature and the friction plate;
The electromagnetic disc brake system of a hoist that restricts the movement of the brake disc toward the armature when the brake disc reaches the neutral position . The elastic body and the other elastic body are O-rings continuous in the circumferential direction of the hub, and a fitting groove in which the O-ring is fitted is formed on an outer peripheral surface of the hub, and The electromagnetic disk brake device of the hoist according to claim 1, wherein a part of an O-ring is projected from the fitting groove onto the outer peripheral surface of the hub . The brake disc has a boss portion engaged with the spline of the hub, and a part of the O-ring projected from the fitting groove between the brake disc and the friction plate is from the friction plate side The winding according to claim 2, wherein a part of the O-ring projected from the fitting groove between the armature and the brake disc contacts the boss from the side of the armature while being in contact with the boss . Disk brake device for aircraft. A rotating shaft driven by a motor;
A hub coaxially provided on the outer periphery of the rotating shaft, and rotating following the rotating shaft and having a spline along the axial direction of the rotating shaft on the outer peripheral surface;
A brake disk that has a boss that engages with the spline of the hub and that rotates integrally with the hub and is supported by the hub so as to be movable in the axial direction of the rotation shaft;
A friction plate disposed on one side along the moving direction of the brake disc for receiving the brake disc;
An armature, disposed on the other side along the moving direction of the brake disc, and elastically biased in a direction for pressing the brake disc against the friction plate;
An electromagnet for attracting the armature away from the brake disc;
The electromagnetic disc brake device of a hoist wherein the brake disc is movable in the axial direction of the rotation shaft between the friction plate and the armature,
A first holder attached to the hub and facing the boss of the brake disc from the side of the friction plate;
A second holder attached to the hub and facing the boss of the brake disc from the side of the armature;
Supported by the first holder, the brake disc is compressed when it is pressed against the friction plate, and when the armature is attracted by the electromagnet, the brake disc is elastically moved away from the friction plate A first elastic body biased to
A second elastic body supported by the second holder to restrict movement of the brake disc in a direction away from the friction plate when the armature is attracted by the electromagnet;
Disk brake device of the hoist equipped with 5. The shim plate according to claim 4, wherein a shim plate is interposed between the hub and the first holder and between the hub and the second holder in a removable manner in the axial direction of the rotation shaft . Electromagnetic disc brake device for hoisting machines.

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