JP2009024819A - Brake of hoist - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hoist brake of low manufacturing cost by realizing the shortening of the assembly time of the brake. <P>SOLUTION: In the brake of an internal expansion type hoist which is equipped with a fixed iron core 6 coaxial with the axis 5 of a rotor 4, a movable iron core 7 connected with the fixed iron core 6 through an elastic member so as to move radially to the rotor 4, a brake shoe 8 connected with the movable iron core 7 through a circumferential bolt 9, a torque receiver 11 having an end face to receive a circumferential end face of the rotor 4 in the brake shoe 8 and two guide members 12 connected with the torque receiver 11 circumferentially in parallel to the rotor 4 and guide the brake shoe 8, a projection 15 is provided with two guide members 12 and restrains the brake shoe 8 at two points of both sides of the guide member 12, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brake for a hoisting machine in which manufacturing cost is reduced by facilitating assembly and adjustment of a brake shoe.

  In the conventional hoisting machine, a pair of left and right electromagnetic brakes are arranged to face the inner peripheral surface of the rotor by 180 °. An electromagnetic brake is an internal expansion type brake device built in a rotor, and includes a stationary iron core and a movable iron core. A brake shoe is attached to the tip of the movable iron core. The brake shoe is attached to the tip of the movable iron core via a connecting member, and is disposed between the two torque receivers. In order to adjust the gap between the brake shoe and the rotor, spherical seats and spherical bolts are used as connecting members.

  In such a brake, the assembly accuracy of the brake shoe is improved by housing the spherical seat in a shallow recess provided in the brake shoe and restricting the position of the spherical seat (for example, see Patent Document 1).

  Also, by providing a protrusion at the center of the side surface in a direction parallel to the end surface perpendicular to the circumferential direction of the rotor of the brake shoe hoisting machine and supporting it with an elastic member from one side or both sides, the assembled brake shoe becomes horizontal. Thus, the inclination was adjusted (for example, refer patent document 2).

JP 2002-303341 A (page 3, FIG. 5) WO 2004/36080 (page 16, FIG. 6)

  In the hoisting machine brake as described in Patent Document 1, in order to improve the assembly accuracy of the brake shoe, a part with high dimensional accuracy is required, resulting in an increase in manufacturing cost. On the other hand, when the machining cost of the parts is reduced, the positioning accuracy of the spherical seat is lowered, so that time is required for adjustment when the brake is assembled, and there is a problem that the manufacturing cost of the brake increases.

  Further, the hoisting machine brake as in Patent Document 2 has a problem that the adjustment target dimension is very small, so that it is necessary to repeatedly adjust, the assembly takes time, and the manufacturing cost increases. It was.

  The present invention has been made to solve the above-described problems, and has as its object to provide a brake for a hoisting machine that can reduce the assembly time of the brake and has a low manufacturing cost.

A brake for a hoist according to the present invention includes a coil, a fixed iron core coaxial with a rotor shaft, a movable iron core connected to the fixed iron core via an elastic member movably in the radial direction of the rotor, and the movable A brake shoe connected to an iron core, a torque receiver having an end face facing each end face of the brake shoe in the circumferential direction of the rotor, and the brake shoe is connected to the torque receiver in such a manner that the brake shoe is sandwiched between the front and back substantially parallel to the circumferential direction. A pair of guide members for guiding the radial movement of the brake shoe as a set;
A protrusion is provided on one of the two guide members and the brake shoe on the surface where the two guide members and the brake shoe face each other, and the protrusion restricts the brake shoe on both sides of the guide member. It is what has been.

  According to the hoisting machine brake according to the present invention, the brake shoe can be easily adjusted in parallel with the torque receiver. As a result, the brake shoe can be easily assembled and adjusted, and the manufacturing cost of the brake can be reduced.

Embodiment 1 FIG.
1 is a front sectional view showing Embodiment 1 of a brake for a hoist according to the present invention.
The brake 2 of the hoisting machine 1 is substantially coaxial with the rotating shaft 5 of the hoisting machine 1 and is fixed to the inside of the rotor 4 of the hoisting machine 1, and the fixed iron core 6 and the fixed iron core provided with the coil 24. 6 and a movable iron core 7 connected through an elastic member such as a compression spring, a brake shoe 8 connected to the movable iron core 7, a spherical bolt 9 serving as a connecting means between the movable iron core 7 and the brake shoe 8, and a spherical bolt 9 A spherical seat 10 to be supported, a plate spring 13 that elastically supports the spherical bolt 9 and the brake shoe 8 via the spherical seat 10, and an end surface in the circumferential direction of the rotor 4, and the circumferential end surface of the brake shoe 8 is sandwiched and guided. The internal expansion brake 2 includes two guide members 12 that restrain the torque receiver 11 and the brake shoe 8 in a direction perpendicular to the circumferential direction of the rotor 4 of the hoist 1. The torque receiver 11 is formed integrally with the housing 3 or is fixed to the housing 3 with screws.

  In the case of the brake 2 of the hoisting machine 1, the operation and release are controlled by switching between interruption and energization of the current that excites the coil 24. When the brake 2 is operated, the brake shoe 8 connected to the movable iron core 7 is applied to the rotor 4 by the force of the compression spring 25 that pushes the movable iron core 7 radially outward of the rotor 4 by interrupting the current to the coil 24. Pressed. On the other hand, when the brake 2 is released, by supplying a current to the coil 24, the brake shoe 8 is attracted together with the movable iron core 7 by the magnetic attraction force generated in the fixed iron core 6 and is separated from the rotor 4.

2A and 2B are enlarged views around the brake shoe of the brake of the hoisting machine according to the first embodiment, where FIG. 2A is a front view and FIG. 2B is an AA arrow view in FIG.
The brake shoe 8 is restricted from moving in the circumferential direction by the two torque receivers 11 provided in the circumferential direction of the rotor 4 of the hoisting machine 1. Further, the brake shoe 8 is provided with an end face perpendicular to the circumferential direction of the rotor 4 of the hoisting machine 1 via two pairs of protrusions 15 provided on the surface of the guide member 12 in contact with the brake shoe 8. 8 is held substantially parallel to the torque receiver 11. In FIG. 2, the gap 22 between the brake shoe 8 and the protrusion 15 is drawn large in order to explain the configuration of the present invention, but the actual size of the gap 22 is several tens of μm or less.

  In this type of brake 2, the gap 26 between the brake shoe 8 and the rotor 4 is set to several tens by adjusting the length L 1 of the portion of the spherical bolt 9 protruding from the movable iron core 7 in order to keep the braking force constant. It is necessary to adjust the accuracy to μm. On the other hand, in this type of brake 2, the rotor 4 may rotate while the brake shoe 8 is pressed against the rotor 4, so that the torque receiver 11 prevents the brake shoe 8 from being displaced in the circumferential direction of the rotor 4. This suppresses the displacement of the brake shoe 8 and prevents an excessive force from acting on the spherical bolt 9. Therefore, it is necessary to adjust the brake shoe 8 at the time of assembly so as to be parallel to the torque receiver 11.

FIG. 3 is a front view showing the structure of a conventional brake (a) and a view taken along the line AA of (a).
In the conventional structure shown in FIGS. 3A and 3B, the spherical seat 10 that supports the spherical bolt 9 is housed in a shallow concave portion 14 provided in the brake shoe 8, and the concave portion 14 has two side portions with high dimensional accuracy. By restricting the position of the spherical seat 10 by 28, the brake shoe 8 is assembled to the torque receiver 11 with high accuracy. However, with this structure, there is a problem that the manufacturing cost increases because parts with higher dimensional accuracy are required when the assembly accuracy is further improved. Further, when using parts with low dimensional accuracy in order to reduce the processing cost of the parts, the gap 26 between the brake shoe 8 and the rotor 4 is accommodated with an accuracy of about several tens of μm, and the brake shoe 8 and the torque receiver 11 are parallel to each other. Therefore, there is a problem that the manufacturing cost is increased, for example, since it is necessary to repeatedly adjust the assembly so that assembly time is required.

  According to the configuration shown in FIG. 2, the end surface perpendicular to the circumferential direction of the rotor 4 in the brake shoe 8 can be constrained at two points, so that it can be easily adjusted in parallel with the torque receiver 11, and as a result, The assembling property of the brake shoe 8 can be improved, and the manufacturing cost of the brake 2 can be reduced.

FIG. 4 is a bottom view showing another example in the first embodiment.
In FIG. 2, the structure in which the protrusions 15 are provided on both sides of the guide member 12 is shown. However, as shown in FIG. 4, two pairs of protrusions 15 are provided on the brake shoe 8, and the guide member 12 facing the protrusions 15 is provided. May be a flat surface.

  According to the configuration as shown in FIG. 4, the projections 15 can be concentrated on the brake shoe 8, and the processing of the guide member 12 can be simplified.

FIG. 5 is a bottom view showing another example in the first embodiment.
In the configuration shown in FIG. 2, the surface of the guide member 12 that contacts the protrusion 15 provided on the brake shoe 8 needs to be processed flat, and it is necessary to reduce the surface roughness in order to improve sliding. There is. At this time, as shown in FIG. 5, a step 27 is provided on the surface of the brake shoe 8 that contacts the protrusion 15 provided on the guide member 12. As shown in FIG. 5, the manufacturing cost can be reduced by limiting the region to be processed by providing the brake shoe 8 with the step 27. In the case of FIG. 4, there is a method of obtaining a similar effect by providing a step 27 on the guide member 12.

FIG. 6 is a bottom view showing another example in the first embodiment.
You may combine the structure shown in FIG. 2 and FIG. As shown in FIG. 6, one of the two surfaces facing the guide member 12 of the brake shoe 8 is a flat surface, the other is a surface provided with two protrusions 15, and is opposed to the flat surface of the brake shoe 8. There is also a method in which two guides 15 are provided on the guide member 12 and the guide member 12 facing the surface on which two projections 15 of the brake shoe 8 are provided is flat.

  4, 5, and 6, as in FIG. 2, the gap 22 between the brake shoe 8 and the protrusion 15 is greatly illustrated in order to explain the configuration of the present invention.

FIG. 7 is a bottom view showing another example in the first embodiment.
When the protrusion 15 is a rigid body, there is a possibility that a shortage or excess of the force that restrains the brake shoe 8 substantially parallel to the torque receiver 11 may occur due to variations in the length L2. Therefore, as shown in FIG. 7, there is a method of using an elastic member as the guide member 12. By arbitrarily setting the rigidity of the guide member 12, the force for restraining the brake shoe 8 can be designed in advance, so that adjustment during assembly can be simplified and the assembly cost of the brake 2 can be reduced.

FIG. 8 is a bottom view showing another example in the first embodiment.
As a method of providing the protrusions 15, there are methods such as fixing the abutting plate 20 to the guide member 12 with screws 19 or attaching them as shown in FIG. 8. Although not shown, there is also a method of providing the projection 15 on the brake shoe 8 in the same manner.

9 and 10 are bottom views showing other examples in the first embodiment.
As shown in FIG. 9, in order to adjust the restraining force by the guide member 12, there is a method of pushing the contact plate 20 with a screw 19. In addition, as shown in FIG. 10, there is a method of adjusting the restraining force of the brake shoe 8 by utilizing the deflection of the elastic element 16 such as a spring disposed in the fixed portion of the guide member 12. By these methods, adjustment during assembly can be further simplified, and the manufacturing cost of the brake 2 can be reduced.

FIG. 11 is a bottom view showing another example in the first embodiment.
The brake shoe 8 is inserted into the torque receiver 11 from the axial direction of the rotor 4 shown in FIG. 1 at the time of assembly. However, since the gap between the brake shoe 8 and the torque receiver 11 is minute, it is difficult to assemble. Therefore, as shown in FIG. 11, by chamfering the chamfered portion 23 of the brake shoe 8, the brake shoe 8 can be easily inserted into the torque receiver 11. For chamfering, C chamfering as shown in FIG. 11 (a), R chamfering as shown in FIG. 11 (b), or a surface facing the torque receiver 11 as shown in FIG. There is chamfering.

  According to the configuration shown in the first embodiment, the brake shoe 8 can be restrained in a direction parallel to the end face of the rotor 4 of the hoisting machine 1, so that the side surface portion 28 shown in FIG. 3 does not require high dimensional accuracy. It becomes. As shown in FIG. 12A, when the concave portion 14 in which the spherical seat 10 is disposed does not have the side surface portion 28, the processing of the brake shoe 8 is simplified, so that the manufacturing cost of the brake 2 can be reduced.

Embodiment 2. FIG.
FIG.13 and FIG.14 is a bottom view which shows Embodiment 2 of the brake of the winding machine based on this invention, and has shown it with a partial cross section.
When the rigid projection 15 is provided on the brake shoe 8 or the guide member 12 and the brake shoe 8 is restrained substantially parallel to the torque receiver 11 as in the first embodiment, for example, the height of the projection 15 varies. Depending on these factors, the binding force may be insufficient or excessive.

  Therefore, as shown in FIG. 13, the elastic structure 21 using a spring or the like is built in the brake shoe 8 to provide a protrusion, or as shown in FIG. The force with which the guide member 12 restrains the brake shoe 8 is adjusted to a range designed in advance by a method of providing a protrusion in the housing.

  According to such a configuration, it is not necessary to adjust the restraining force of the brake shoe 8 according to the size of the protrusion 15, so that adjustment during assembly can be simplified and the manufacturing cost of the brake 2 can be reduced.

Embodiment 3 FIG.
15 and 16 are bottom views showing Embodiment 3 of the brake of the hoist according to the present invention.
As shown in FIG. 15, there is also a method of providing the protrusion 15 by attaching the sheet metal processing part 18.

  According to the configuration as shown in FIG. 15, the projection 15 can be configured by the sheet metal processed part 18 that is standardized even with different types of brakes, and thus the manufacturing cost of the component that configures the projection 15 can be reduced.

  Further, as shown in FIG. 16, there is a method in which a part of the guide member 12 is plastically deformed to provide the protrusion 15.

  According to the configuration shown in FIG. 16, the number of parts of the protrusion 15 can be reduced, so that the cost of the brake 2 can be reduced.

Embodiment 4 FIG.
FIG. 17 is a bottom view showing Embodiment 4 of the hoisting machine brake according to the present invention.
As shown in the first embodiment, when two spherical bolts 9 as connecting means between the movable iron core 7 and the brake shoe 8 are arranged symmetrically in the circumferential direction of the rotor 4 with respect to the center of the brake shoe 8 As shown in FIG. 17A, the distance L3 between the two points of the protrusion 15 where one guide member 12 restrains the brake shoe 8 is set to be equal to or larger than the distance L4 of the spherical bolt 9.

  According to the configuration shown in FIG. 17A, the distance L3 between the two points of the projection 15 where one guide member 12 restrains the brake shoe 8 is smaller than the distance L4 of the spherical bolt 9. FIG. Since the brake shoe 8 can be stably restrained substantially parallel to the torque receiver 11 as compared with the configuration as shown in FIG. 5, the brake shoe 8 can be easily adjusted and the manufacturing cost of the brake 2 can be expected to be reduced.

Embodiment 5 FIG.
FIG. 18 is a bottom view showing a fifth embodiment of the brake of the hoist according to the present invention.
In the brake of the present invention, the brake shoe 8 is restrained from both sides by the two protrusions 15 so as to be substantially parallel to the torque receiver 11. Therefore, when the friction coefficient between the brake shoe 8 and the guide member 12 is high, it is assumed that the sliding resistance when the brake shoe 8 and the movable iron core 7 are operated increases and the friction loss increases.

  For this reason, as indicated by hatching in FIG. 18, the friction coefficient of the contact portion 29 where the brake shoe 8 or the guide member 12 contacts each other is made lower than that of the non-contact portion. With such a configuration, even when the brake shoe 8 and the guide member 12 are in contact with each other, the sliding resistance between the brake shoe 8 and the guide member 12 can be reduced, so that a smooth operation of the brake 2 can be realized.

  As a method of reducing the friction coefficient, a method in which at least one of the protrusion 15 or the brake shoe 8 or the guide member 12 facing the protrusion 15 is made of a material having a low friction coefficient such as copper or bronze, or an arbitrary material is used. There is a method in which a material with a low coefficient of friction such as copper or bronze is bonded in the vicinity of the configured protrusion 15 or at least one of the contact portions 29 of the brake shoe 8 or the guide member 12 facing the protrusion 15. These methods increase the degree of freedom in selecting materials for the protrusions 15, the brake shoes 8, and the guide members 12, thereby reducing material costs.

As another method for reducing the coefficient of friction, the surface of the projection 15 made of an arbitrary material or the vicinity of at least one of the contact portion 29 of the brake shoe 8 or the guide member 12 facing the projection 15 is provided. There is a method of processing.
Surface treatments that reduce the friction coefficient include a method in which a fluorine compound is dispersed in a nickel and phosphorus compound, and a method in which a low friction material such as a fluorine compound is formed by sputtering or vapor deposition. By these methods, since the site | part which reduces a friction coefficient can be limited to the minimum necessary, processing cost can be reduced.

  According to the configuration shown in FIG. 18, the material cost and the processing cost can be reduced, so that the brake manufacturing cost can be reduced.

  The hoisting machine brake according to the present invention can be effectively used for an elevator or the like.

It is front sectional drawing which shows Embodiment 1 of the brake of the winding machine which concerns on this invention. It is an enlarged view around the brake shoe of the brake of the hoisting machine according to the first embodiment. It is a front view (a) which shows the structure of the conventional brake, and the AA arrow line view of (a). FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 10 is a bottom view showing another example in the first embodiment. FIG. 6 is a bottom view for explaining an effect in the first embodiment. It is a bottom view which shows Embodiment 2 of the brake of the winding machine which concerns on this invention. It is a bottom view which shows Embodiment 2 of the brake of the winding machine which concerns on this invention. It is a bottom view which shows Embodiment 3 of the brake of the winding machine which concerns on this invention. It is a bottom view which shows Embodiment 3 of the brake of the winding machine which concerns on this invention. It is a bottom view which shows Embodiment 4 of the brake of the winding machine which concerns on this invention. It is a bottom view which shows Embodiment 5 of the brake of the winding machine which concerns on this invention.

Explanation of symbols

1 hoisting machine, 2 brakes, 3 housing, 4 rotor, 5 rotating shaft,
6 Fixed iron core, 7 Movable iron core, 8 Brake shoe, 9 Spherical bolt, 10 Spherical seat,
11 Torque receiver, 12 Guide member, 13 Leaf spring, 14 Recess, 15 Protrusion,
16 elastic elements, 17 ball plungers, 18 sheet metal parts, 19 screws,
20 backing plate, 21 elastic structure, 22 gap, 23 chamfered portion,
24 coil, 25 compression spring, 26 gap, 27 step, 28 side surface,
29 Contact part.

Claims (12)

A fixed iron core comprising a coil and coaxial with the rotor axis; a movable iron core connected to the fixed iron core via an elastic member movably in the radial direction of the rotor; a brake shoe connected to the movable iron core; A torque receiver having an end surface facing each end surface of the brake shoe in a direction, and the brake shoe being connected to the torque receiver in a shape sandwiched between the front and back substantially parallel to the circumferential direction, and a set of the brake shoe Two guide members for guiding the radial movement;
A protrusion is provided on one of the two guide members and the brake shoe on the surface where the two guide members and the brake shoe face each other, and the protrusion restricts the brake shoe on both sides of the guide member. A hoisting machine brake. The brake for a hoisting machine according to claim 1, wherein a surface of the guide member or the brake shoe facing the protrusion is a flat surface. 3. The hoisting machine brake according to claim 1, wherein the guide member is an elastic member. 2. The hoisting machine brake according to claim 1, wherein an end face R of the brake shoe facing the torque receiver is chamfered. 2. The hoisting machine brake according to claim 1, wherein a corner portion of the brake shoe facing the torque receiver is chamfered. The hoisting machine brake according to claim 1 or 2, wherein the guide member is connected to the torque receiver via an elastic element. The brake for a hoisting machine according to claim 1 or 2, wherein the brake shoe includes an elastic structure, and the protrusion is provided on the brake shoe via the elastic structure. 3. The brake for a hoisting machine according to claim 1, wherein the protrusion is a sheet metal processed part obtained by bending a metal plate. The hoisting machine brake according to claim 1 or 2, wherein the protrusion is formed by plastic deformation of a part of the guide member. The position of the protrusion that restrains the brake shoe is outside the two connection points that are located on the outermost side in the circumferential direction among the plurality of connection points that connect the movable iron core and the brake shoe, and the brake 2. A brake for a hoist according to claim 1, wherein a plurality of brakes are arranged substantially symmetrically with respect to the center of the shoe. The brake for a hoisting machine according to claim 1, wherein the surface of the brake shoe or the guide member that contacts the projection is subjected to a process for reducing a coefficient of friction as compared to a non-contact surface. The brake for a hoisting machine according to claim 1, wherein a step is provided on a surface of the brake shoe or the guide member that contacts the protrusion.

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