JP6461399B1 - Brake device - Google Patents

Abstract

A brake device capable of ensuring the length of a sliding bearing is provided.
A braking device includes a braking member that presses and brakes a rotating body, and an electromagnetic drive that drives the braking member. The electromagnetic drive includes a coil, an iron core that moves by excitation of the coil, and an iron core. A guide shaft fixed to the guide shaft, a base in which the guide shaft is inserted to guide movement of the guide shaft in the axial direction, and a slide in which the guide shaft is inserted and inserted in the inner periphery of the guide hole. A bearing and a return spring that urges the guide shaft toward the initial position in the axial direction, and the guide hole of the base is formed with a stepped portion having a narrowed hole diameter with which the insertion side end of the slide bearing contacts. Yes, the end opposite to the insertion side end of the slide bearing is pressed by the biasing force of the return spring.
[Selection] Figure 1

Description

  Embodiments described herein relate generally to a brake device that brakes a rotating body attached to an output shaft.

  For example, a brake device that brakes a rotating body of an elevator hoist includes a braking member that presses and brakes the rotating body, and an electromagnetic drive that drives the braking member to a position away from the pressure contact position with the rotating body. ing. In this electromagnetic driving machine, the guide shaft fixed to the iron core is moved in the axial direction by moving the iron core by exciting the coil.

  The guide shaft is inserted into a guide hole formed in the base, and a slide bearing on which the guide shaft slides is provided between the guide shaft and the inner peripheral surface of the guide hole. Conventional sliding bearings are attached in the guide holes using retaining rings such as C-rings at both ends as a retaining against the base.

JP 2012-52606 A

  However, when mounting a slide bearing with a retaining ring, it is necessary to make a groove in which the retaining ring engages at both ends of the guide hole, ensuring the length of the sliding bearing, that is, the length of the sliding portion of the guide shaft. It was difficult to do.

  If the length of the sliding portion is shortened, there is a disadvantage that the surface pressure against the guide shaft is increased and the sliding bearing is easily worn.

  The objective of this embodiment is to provide the brake device which can ensure the length of a slide bearing.

  The brake device according to the present embodiment includes a braking member that presses against the rotating body and brakes the rotating body, and an electromagnetic drive that drives the braking member to a pressure contact position with the rotating body and a position away from the pressure contact position. The electromagnetic driving machine includes a coil, an iron core that is moved by excitation of the coil, a guide shaft that is fixed to the iron core, and the guide shaft is inserted to guide the movement of the guide shaft in the axial direction. A base in which a guide hole is formed; a slide bearing portion that is inserted into an inner periphery of the guide hole and on which the guide shaft slides; and a return spring that biases the guide shaft toward an initial position in the axial direction; The guide hole of the base is formed with a stepped portion with a narrowed hole diameter with which the insertion side end of the slide bearing portion abuts, and the end opposite to the insertion side end of the slide bearing portion is The bush pressed by the urging force of the return spring It is over key device.

It is a horizontal sectional view of the electromagnetic drive machine of the brake device concerning an embodiment. It is a schematic block diagram of the brake device which concerns on embodiment, (a) is a front view, (b) is a top view. It is a modification of an electromagnetic drive machine, Comprising: It is a horizontal sectional view which shows the other arrangement | positioning state of a slide bearing.

Hereinafter, a brake device 1 according to an embodiment will be described with reference to FIGS. 1 and 2.
As shown in FIG. 2, the brake device 1 is a brake device for an elevator hoisting machine, and includes a braking member 5 that presses against the rotating body 3 assembled to the output shaft of the hoisting machine and brakes the rotating body 3. The electromagnetic drive 7 and the interlocking mechanism 9 that moves the braking member 5 between the pressure contact position and the non-pressure contact position (position away from the pressure contact position) of the rotating body 3 in conjunction with the drive of the electromagnetic drive machine 7. I have.

  The rotating body 3 is a cylindrical drum, and includes a cylindrical surface 3a against which the braking member 5 is pressed as a braked surface. The braking member 5 is a brake shoe, and is provided on the left and right so as to sandwich the rotating body 3.

  As shown in FIG. 1, the electromagnetic driving machine 7 includes a coil 11, an iron core (plunger) 13, a guide shaft 15, a sliding bearing 17, a base 19, and a case 21.

  The coil 11 is provided on the outer peripheral side of the iron core 13 and moves the iron core 13 in the direction of arrow A by applying an electromagnetic force when energized. An insertion hole 13a through which the guide shaft 15 is inserted is formed in the iron core 13, and a step portion 13b with which a piece 15c (described later) of the guide shaft 15 abuts is formed in the insertion hole 13a.

  The guide shaft 15 has a large diameter portion 15a and a small diameter portion 15b, and a boundary portion between the large diameter portion 15a and the small diameter portion 15b is a piece 15c. The guide shaft 15 has the tip 15d of the small diameter portion 15b inserted into the insertion hole 13a of the iron core 13, the piece 15c is brought into contact with the stepped portion 13b of the insertion hole 13a, and the tip 15d is attached to the iron core 13 with the nut 23. It is fixed.

  Further, in the guide shaft 15, a rear end portion 15e located on the opposite side of the iron core 13 is provided so as to protrude from the rear end 19a of the base 19, and a flange portion 15f is formed. The flange portion 15f functions as an actuator for the interlocking mechanism 9 described later.

  The base 19 is formed with a guide hole 25 through which the large-diameter portion 15a of the guide shaft 15 is inserted to guide the movement of the guide shaft 15 in the axial direction. A slide bearing 17 is inserted into the guide hole 25 from the rear end 19 a of the base 19, and a stepped portion 25 a having a narrowed diameter is formed on the insertion side end (tip) 17 a side of the slide bearing 17. . The step portion 25 a is a step portion corresponding to the thickness dimension of the slide bearing 17. Further, the rear end 17 b of the slide bearing 17 is arranged to be aligned with the rear end 19 a of the base 19.

  The sliding bearing 17 is a cylindrical member, made of a fluororesin material impregnated with a lubricant, for example, made of polytetrafluoroethylene material impregnated with a lubricant. In the present embodiment, two identical bearings 17 are arranged in series.

  A return spring 24 is disposed between the rear end 17 b of the slide bearing 17 and the flange portion 15 f of the guide shaft 15. The return spring 24 is a compression coil spring, one end 24a is in contact with the rear end 17b of the sliding bearing 17, and the other end 24b is in contact with the flange portion 15f.

  Next, the interlocking mechanism 9 will be described with reference to FIG. As shown in FIG. 2A, the interlocking mechanism 9 includes a pair of arms 27 a and 27 b to which the braking member 5 is attached, an arm sliding shaft 29, a braking spring 31, and a pair of levers 33. .

  The pair of arms 27 a and 27 b are provided opposite to the left and right positions sandwiching the rotating body 3, and each arm 27 a and 27 b is pivotally supported so that the base end portion 35 can be rotated toward the rotating body 3. . An arm sliding shaft 29 is inserted through the rotation end 37 of each arm 27a, 27b.

  One end portion 29a of the arm sliding shaft 29 is inserted into one arm 27a and fixed with a nut 39, and the other end portion 29b is inserted into the other arm 27b and a braking spring between the other arm 27b. It is fixed with a nut 41 through 31. With this configuration, the one and the other arms 27 a and 27 b are constantly urged toward the rotating body 3 by the braking spring 31.

  Each of the pair of arms 27a and 27b is provided with a lever 33 further on the rotation end side (upper side in FIG. 2A) than the arm sliding shaft 29.

  As shown in FIG. 2B, each lever 33 has a long side portion 33a and a short side portion 33b, and the long side portion 33a and the short side portion 33b form an L shape in plan view. The end portions of the opposed long side portions 33a are pivotally supported around the axis 45 so as to be rotatable about the vertical axis. Each short side portion 33b is in contact with a projecting portion 43 that projects from the opposing arm 27a toward the rotating side. Further, the L-shaped corner portion of each lever 33 is rotatably supported by a shaft 45. A flange portion 15 f formed on the guide shaft 15 of the electromagnetic drive machine 7 is engaged with an end portion of the long side portion 33 a of each lever 33.

  Next, the assembly of the electromagnetic drive machine 7 will be described. In FIG. 1, a guide hole 25 is formed in the base 19, and a step portion 25 a having a narrow hole diameter is formed in the guide hole 25. Then, the slide bearing 17 is inserted into the guide hole 25 formed in the base 19 from the insertion side end 17a side, and the insertion side end 17a of the slide bearing 17 is brought into contact with the step portion 25a. In the present embodiment, two sliding bearings 17 are inserted so as to be arranged in series.

  Next, the return spring 24 is engaged with the flange portion 15f and attached to the rear end portion 15e of the guide shaft 15, and the guide shaft 15 is inserted into the inner peripheral side of the slide bearing 17 of the base 19 from the front end portion 15d. At the same time, the tip 15 d is passed through the insertion hole 13 a of the iron core 13 and fixed to the iron core 13 with the nut 23. On the other hand, the coil 11 and the case 21 are attached to the base 19.

  Next, the operation of the brake device 1 will be described.

  As shown in FIG. 1, when the electromagnetic driver 7 is in a non-operating state, that is, when no current is applied to the coil 11, the guide shaft 15 is in the initial position, and in FIG. The braking member 5 fixed to the arms 27 a and 27 b is pressed against the cylindrical surface 3 a of the rotating body 3 by the urging force of the braking spring 31 to brake the rotating body 3. Thus, when the elevator hoisting machine is stopped, the output shaft of the hoisting machine is fixed so that the rider does not move.

  On the other hand, when the hoisting machine starts to move, the electromagnetic drive machine 7 applies an electric current to the coil 11 in FIG. Thereby, the iron core 13 moves together with the guide shaft 15 in the direction indicated by the arrow A by electromagnetic action. The flange portion 15 f of the guide shaft 15 moves from the initial position in a direction to contract the return spring 24 against the urging force of the return spring 24. In FIG. 2, in the interlocking mechanism 9, each lever 33 engaged with the flange portion 15 f rotates to pull the braking member 5 attached to the arms 27 a and 27 b away from the cylindrical surface 3 a of the rotating body 3. Rotate. Thereby, braking (brake) is released.

  As described above, in the brake device 1, the output shaft of the hoisting machine is fixed or released while the elevator is operated and the rider repeatedly moves and stops. Each time, in the electromagnetic drive machine 7, the guide shaft 15 slides on the slide bearing 17.

  Next, effects of the brake device 1 according to the present embodiment will be described. As shown in FIG. 1, in the electromagnetic drive machine 7, the large-diameter portion 15 a of the guide shaft 15 slides on the slide bearing 17 and repeats driving, but the slide bearing 17 has a guide hole 25 in the base 19. Since the sliding portion of the slide bearing 17 is longer than that of the prior art and can take a large area, the surface pressure and moment applied to the slide bearing 17 are reduced, and the sliding bearing 17 Bearing life can be extended by suppressing wear.

  Since the sliding bearing 17 does not need to be processed to be attached to the guide hole 25, it can be manufactured easily.

  The sliding bearing 17 can be fixed by inserting the insertion side end 17 a into a position where it abuts on the step portion 25 a of the guide hole 25 and pressing the rear end (end opposite to the insertion side end) 17 b with the return spring 24. Therefore, the sliding bearing 17 can be easily fixed and the assemblability is good.

  Since the slide bearing 17 presses the rear end 17b with the return spring 24 of the guide shaft 15 and uses the return spring 24 of the guide shaft 15, the number of parts can be reduced.

  The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  For example, in the above-described embodiment, the two sliding bearings 17 are inserted and arranged in series in the guide hole 25. However, as shown in FIG. 3, a spacer 47 may be arranged between the two sliding bearings 17 and 17. good. In this way, by using the spacer 47, it is possible to use a type in which the length of the slide bearing 17 disposed in the guide hole 25 is short, and the degree of freedom of the size of the slide bearing 17 to be used can be increased.

  Further, the two sliding bearings 17 are not limited to being arranged in series, but three sliding bearings 17 may be arranged in series, or one sliding bearing 17 having a long length may be used. The number of sliding bearings 17 to be used is as follows. Not limited.

  In the sliding bearing 17, when one long sliding bearing 17 is used, when two or more sliding bearings are arranged in series, when the spacer 47 is arranged between the sliding bearings 17, 17, the sliding bearing portion includes: Called.

  The brake device 1 uses a drum as the rotating body 3, but may be a disc-type brake device including a disk as the rotating body 3.

  DESCRIPTION OF SYMBOLS 1 ... Brake device, 3 ... Rotating body, 5 ... Braking member, 7 ... Electromagnetic drive machine, 11 ... Coil, 13 ... Iron core, 15 ... Guide shaft, 19 ... Base, 17 ... Slide bearing, 17a ... Insertion side end, 17b ... rear end (end opposite to the insertion side end), 24 ... return spring, 25 ... guide hole, 25a ... step.

Claims (2)

A braking member that presses against the rotating body and brakes the rotating body;
An electromagnetic drive that drives the braking member to a pressure contact position with the rotating body and a position away from the pressure contact position;
The electromagnetic driving machine includes a coil, an iron core that is moved by excitation of the coil, a guide shaft that is fixed to the iron core, and a guide hole that guides movement of the guide shaft in the axial direction by inserting the guide shaft. A formed base; a slide bearing portion that is inserted into an inner periphery of the guide hole and on which the guide shaft slides; and a return spring that biases the guide shaft toward an initial position in the axial direction.
The guide hole of the base is formed with a stepped portion having a narrowed hole diameter with which the insertion side end of the slide bearing portion abuts, and the end opposite to the insertion side end of the slide bearing portion is the return spring. A brake device that is pressed by an urging force.   The guide shaft has a flange portion at a position protruding from the guide hole, the return spring is a compression coil spring, the end of the slide bearing portion opposite to the insertion side end, the flange portion, The brake device according to claim 1, which is disposed between the two.

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