JP2008120524A - Electromagnetic brake device of hoisting machine for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic brake device of a hoisting machine for an elevator provided with a rubber, which does not disturb productivity and converts the sum of reaction of a coil spring and reaction of the rubber into nonlinear characteristic. <P>SOLUTION: This device is provided with: an electromagnetic coil 2 wound around a fixed iron core 1 arranged in a drum 9 of the hoisting machine for the elevator; an armature 4 opposingly arranged to the fixed iron core; a compression coil spring 3 arranged between the fixed iron core and the armature; the rubber 5 which is inserted into a circular rubber insertion hole formed in the opposite surface of the fixed iron core or armature and serves as a cushioning when attracting the armature by an electromagnet; and a brake shoe 7 which is mounted on the anti-fixed iron core side of the armature and press-contacts with the inner surface of a drum by the compression coil spring when the electromagnet is immobilized. The rubber insertion hole is formed into a circular hole having a uniform diameter from the opposite surface to a bottom surface, and the rubber is formed into a circular truncated cone shape the bottom surface of which has the same dimension as the diameter of the rubber insertion hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic brake device for an elevator hoisting machine, and more particularly to an electromagnetic brake device for an elevator hoisting machine in which a buffer member is provided between an electromagnetic magnet and a movable iron core.

  An electromagnetic brake device is used as a brake for an elevator hoist. In this electromagnetic brake device, during braking, a coil spring reaction force generated from a coil spring is applied to the armature as a braking force, and a brake shoe connected to the armature is pressed against the drum to suppress the operation of the drum. Further, when opened, the electromagnetic coil is energized to attract the armature to the fixed iron core by the electromagnetic force generated from the electromagnetic coil, and the brake shoe is pulled away from the drum.

  However, in such an electromagnetic brake device, when the armature is attracted to the fixed iron core by electromagnetic force, an impact sound may be generated due to contact between the armature and the fixed iron core, and the electromagnetic force is further reduced. During braking in which the armature is pressed against the drum by the reaction force of the coil spring, an impact sound is generated due to contact between the brake shoe and the drum.

  As means for alleviating the impact, there has been proposed a structure in which a rubber elastic body is inserted between the armature and the fixed iron core. In addition to rubber, there is a metal spring as an elastic body, but rubber can be easily manufactured by injection molding, and in addition to having a large degree of freedom in shape compared to metal, internal friction inside the material is large. In general, rubber parts are used because an impact absorbing effect on impact can be expected.

  Furthermore, in order to suppress the impact sound generated when braking and releasing the brake, it is important to obtain an optimal rubber reaction force and rubber reaction force curve that absorbs the armature speed, that is, the kinetic energy of the armature. In order to obtain the above optimal rubber reaction force and rubber reaction force curve, in addition to the elastic modulus of rubber and the shape of the rubber, the shape of the rubber insertion hole for inserting and restraining the rubber is an important factor. As the prior art, what is described below has been proposed.

(1) The electromagnetic brake of an elevator hoisting machine is composed of an electromagnetic magnet, a fixed iron core, an armature that is a movable iron core, and rubber that is a shock absorber, and an electromagnetic magnet in which the rubber is integrated with the fixed iron core and an armature that is a movable iron core. In addition, a rubber heating control device is built in and the rubber is overheated, so that the elastic modulus of the rubber is always kept in a constant region even at low temperatures to keep the reaction force of the rubber constant. (For example, refer to Patent Document 1).

(2) A rubber serving as a cushioning material is provided between the armature and the fixed iron core, and this rubber is mounted in a rubber insertion hole provided in the armature. The rubber had a cylindrical shape or a convex cross section, and the rubber insertion hole had a counterbore shape or a tapered shape. (For example, refer to Patent Document 2).

(3) Rubber was provided between the fixed iron core and the armature, the rubber had a semicircular cross section, and the rubber insertion hole was a simple counterbore hole having a concave shape. (For example, refer to Patent Document 3).
(4) A rubber insertion hole having a concave section was formed, and an O-ring type rubber was inserted into the rubber insertion hole. (For example, refer to Patent Document 4).

(5) Two types of rubber are provided between the fixed iron core and the movable iron core so as to obtain an optimum rubber reaction force, and the rubber is disposed around the small face area portion protruding in the axial direction. It consisted of a large area part. (For example, refer to Patent Document 5).
(6) Although not used for an electromagnetic brake, there is a configuration in which an impact is buffered by rubber inserted into a concave counterbore hole. (See, for example, Patent Documents 6, 7, and 8).

(7) A metallic coil spring is used instead of rubber so as to obtain a non-linear reaction force curve, thereby obtaining an optimum rubber reaction force. (For example, refer to Patent Document 9).

  Examples of using rubber as in the prior arts (1) to (6) described above make use of the advantage of shock absorption characteristics due to the large internal friction inside the rubber material. However, the above-described conventional techniques (1) to (7) including the metal coil spring have the following problems and problems. That is, although the electromagnetic brake of (1) is provided with a heating device in order to keep the elastic modulus of rubber constant, there is a problem that the cost increases and the configuration of the hoisting machine becomes complicated.

The electromagnetic brake (2) inserts a cylindrical rubber into a rubber insertion hole having a taper on the side surface, but it is difficult to manage the processing dimensions such as the taper angle and depth. In addition, when a convex rubber is inserted into a concave, simple counterbore-shaped rubber insertion hole, only the protruding small face area portion of the convex portion undergoes local elastic deformation, resulting in a large lower portion. Since stress concentrates on the boundary with the surface area, there remains a problem in durability.

The electromagnetic brake of (3) is made by inserting rubber with a semicircular cross section into a rubber insertion hole of a simple counterbore hole, but since the diameter of the bottom surface of the rubber is smaller than the diameter of the rubber insertion hole, There is a problem that the position of the rubber is not stable with respect to the rubber insertion hole. In addition, there is a problem that the accuracy and management of the radius of curvature of the semicircular portion becomes difficult.

The electromagnetic brake (4) uses an O-ring as a cushioning material, but the amount of elastic deformation varies depending on the variation in the diameter of the cross-sectional circle of the O-ring. In addition, although the cross-sectional shape of the rubber insertion hole to be inserted is concave, since the concave cross-section is formed in an annular shape, it is necessary to manage the dimensions on the machining side, such as the diameter or roundness of the annular shape. However, there is a problem that the processing time for processing is increased.

The electromagnetic brake (5) uses two types of rubbers having different elastic coefficients to obtain an optimal rubber reaction force and rubber reaction force curve, and obtains a non-linear rubber reaction force curve. Use has the problem that quality control items increase as costs increase. Further, the rubber used in the electromagnetic brake of (5) is composed of a combination of a large surface area portion and a small surface area portion protruding on the upper surface, but the small surface area portion causes local elastic deformation. There is a problem that stress concentration occurs at the boundary between the large area and the small area.

The silencer mechanism of (6) is used for sprockets and is provided with a space to escape because the cushioning material deforms without difficulty, but there is no place to restrain elastic deformation, so it is difficult to obtain a reaction force Or it has the problem that it is difficult to obtain a nonlinear reaction force curve.
The electromagnetic brake of (7) obtains a non-linear reaction force curve by a metal coil spring, but metal has a problem in terms of shock absorption because metal has less internal friction than rubber. That is, there is a problem that the coil spring pushes back the armature after absorbing the kinetic energy of the armature.

JP 2006-89162 A (FIGS. 1 and 8) Japanese Utility Model Publication No. 62-015630 (FIGS. 1, 2, and 5) Japanese Unexamined Patent Publication No. 2000-220666 (FIGS. 5 and 7) Japanese Patent No. 2669944 (FIG. 1) Japanese translation of PCT publication No. 2005-502838 (FIG. 4)

Japanese Utility Model Publication No. 56-162276 (FIGS. 2 to 7) JP-A-7-18059 (FIGS. 1 to 3) Japanese Patent Laid-Open No. 61-166491 (FIGS. 4 to 7) JP-A-9-100082 (FIGS. 3, 6, 8-10, and 16)

  Next, the operation of a general electromagnetic brake device for an elevator hoisting machine will be described. 8 and 9 are schematic views showing the configuration of the electromagnetic brake of the elevator hoisting machine, in which FIG. 8 shows an open state of the electromagnetic brake, and FIG. 9 shows an operating state of the electromagnetic brake.

  As shown in these figures, the electromagnetic brake of the elevator hoisting machine is coupled to the armature 4 via a fixed iron core 1, an armature 4 that is disposed opposite to the fixed iron core 1 and serves as a movable iron core, and a connecting member 6. The brake shoe 7 is adapted to be slidably contacted or pressed against the inner surface of the drum 9. An electromagnetic coil 2 is wound around the fixed iron core 1, and a compressed coil spring 3 and a rubber 5 as a buffer material are provided between the armature 4 and the fixed iron core 1.

  The rubber 5 is inserted into a rubber insertion hole (not shown) formed in the armature 4, and a recess 8 </ b> A into which the rubber 5 enters is also provided at a portion facing the rubber 5 of the fixed iron core 1. A rubber insertion hole may be formed in the fixed iron core 1 and the recess 8 </ b> A may be formed in the armature 4. In the operation state of the electromagnetic brake shown in FIG. 9, an electromagnetic force is generated when the electromagnetic coil 2 is energized, and a force attracted to the armature 4 acts on the armature 4 side. When the current gradually increases and the electromagnetic force becomes larger than the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5, the brake shoe 7 starts to move away from the inner surface of the drum 9, and the brake shoe 7 and the inner surface of the drum 9 There is a gap between them. When the armature 4 is further attracted to the fixed iron core 1 side, the brake shoe 7 is separated from the drum 9 as shown in FIG. 8, and the armature 4 is brought into close contact with the fixed iron core 1 so that the electromagnetic brake is released. At this time, the coil spring 3 and the rubber 5 are compressed to the maximum.

  Conversely, when the current flowing through the electromagnetic coil 2 is gradually reduced from the electromagnetic brake opened state shown in FIG. 8, the electromagnetic force becomes smaller than the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5. Thus, the armature 4 begins to move away from the fixed iron core 1. When the current is further reduced, a gap begins to be generated between the fixed iron core 1 and the armature 4, and then the brake shoe 7 comes into contact with the inner surface of the drum 9 as shown in FIG. When the current flowing through the electromagnetic coil 2 becomes zero, the brake shoe 7 is pressed against the inner surface of the drum 9 by the total force of the reaction force of the coil spring 3 and the reaction force of the rubber 5, and the electromagnetic brake is applied. Become.

  The pressing force with which the brake shoe 7 presses the inner surface of the drum 9 is mainly borne by the reaction force of the coil spring 3, and the coil spring 3 is maintained at a set compression amount in order to obtain a predetermined pressing force. Further, the rubber 5 maintains a compressed state, that is, a state in which internal friction is high in order to relieve an impact between the brake shoe 7 and the inner surface of the drum 9, and plays a role of absorbing the impact.

  In the above-described release and braking operation of the electromagnetic brake, an impact sound is generated due to the collision between the fixed iron core 1 and the armature 4 when released, and an impact sound is generated due to the collision between the brake shoe 7 and the inner surface of the drum 9 during the braking operation. There is a problem. In order to mitigate this impact sound, rubber 5 is provided between the fixed iron core 1 and the armature 4 as a buffer material. The rubber 5 is inserted and held in a rubber insertion hole (not shown) provided in the armature 4, and the rubber 5 is expanded and contracted in the same manner as the coil spring 3 in the process of releasing the electromagnetic brake and braking operation. .

  In the opening operation shown in FIG. 8, in order to reduce the impact sound between the fixed iron core 1 and the armature 4, the speeds of the armature 4, the connecting member 6 and the brake shoe 7 immediately before the fixed iron core 1 and the armature 4 come into contact with each other. It is necessary to reduce the kinetic energy of the armature 4, the connecting member 6, and the brake shoe 7. Similarly, in the braking operation shown in FIG. 9, in order to reduce the impact sound of the inner surface of the drum 9 and the brake shoe 7, the speeds of the armature 4, the connecting member 6, and the brake shoe 7 immediately before the contact between them are suppressed. is required.

  FIG. 10 shows the relationship between the electromagnetic force, the reaction force of the coil spring, and the reaction force of the rubber in the process of releasing the electromagnetic brake and braking operation. In this figure, the vertical axis indicates the force due to electromagnetic force or the reaction force of the coil spring and rubber, and the horizontal axis indicates the size of the gap between the armature and the fixed iron core.

  In FIG. 10, arrows AB and BC indicate the electromagnetic force in the process from the braking state to the release state of the electromagnetic brake, and the line FG indicates the sum of the reaction force of the coil spring and the reaction force of the rubber. That is, in the process from the braking state to the release state, in FIG. 9, the current gradually increases from the state where the current flowing through the electromagnetic coil 2 is zero, and the electromagnetic attractive force increases as indicated by an arrow AB.

  Since the armature 4, the connecting member 6, and the brake shoe 7 are attracted to the fixed iron core 1 by this electromagnetic force, the electromagnetic force is larger than the line FG that is the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5. Maintain state. At that time, the area surrounded by FGCB is the kinetic energy of the armature 4, the connecting member 6, and the brake shoe 7.

  In FIG. 10, arrows CD, DE, and EA indicate electromagnetic forces in the process from the open state to the braking state. In this process, the current flowing through the electromagnetic coil 2 in FIG. 8 gradually decreases as shown by the arrow CD, and the armature 4, the connecting member 6, and the brake shoe 7 are brought into contact with the inner surface of the drum 9 by the reaction force of the coil spring 3 and the reaction force of the rubber 5. The electromagnetic force is kept smaller than the line FG which is the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5, and the gap between the fixed iron core and the armature is indicated by an arrow DE. As it increases, the electromagnetic force reaches zero as indicated by arrow EA. At this time, the area surrounded by F-G-D-E becomes the kinetic energy of the armature 4, the connecting member 6, and the brake shoe 7.

  As can be seen from FIG. 10, the kinetic energy can be reduced by reducing the difference between the electromagnetic force and the sum of the reaction force of the coil spring and the reaction force of the rubber. However, the electromagnetic force is reduced in all regions of the gap in which the armature 4 is movable. If the difference between the force and the sum of the reaction force of the coil spring and the reaction force of the rubber is made small, there arises an adverse effect that the time until the electromagnetic brake is released and the braking is increased. Therefore, in order to reduce the influence on the opening and braking time and reduce the impact sound, the kinetic energy is rapidly reduced immediately before the armature 4 and the fixed iron core 1 come into contact with each other. It is necessary to rapidly reduce the kinetic energy immediately before the inner surface comes into contact.

  FIG. 11 shows the above-described state. That is, it is necessary to increase the speed at the start of movement of the armature 4, the connecting member 6, and the brake shoe 7, and to decelerate immediately before contacting the inner surface of the fixed iron core 1 or the drum 9. Note that the kinetic energy can be suppressed by reducing the difference between the electromagnetic force and the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5 immediately before the contact between the brake shoe 7 and the inner surface of the drum 9 during braking. I can do it.

  However, since the reaction force of the coil spring 3 is set to a predetermined value to press the inner surface of the drum 9 and cannot be made smaller than necessary, the reaction force of the rubber 5 is minimized, that is, the reaction force of the rubber 5 is made zero. However, the state in which the reaction force of the rubber 5 is zero means that the rubber 5 is not compressed, and means that the armature 4 and the rubber 5 are separated from or in contact with each other.

  Therefore, in this state, the internal friction of the rubber 5 is poor, and the rubber 5 cannot absorb the impact between the brake shoe 7 and the inner surface of the drum 9. That is, it is necessary that the rubber 5 is always compressed even during braking. The coil spring 3 or the rubber 5 has a specific spring constant or elastic coefficient due to the material and shape, and the coil spring 3 draws a reaction force line according to expansion and contraction, but the reaction force line may draw a linear shape instead of a curve. Since it is general, when trying to obtain a non-linear characteristic of the sum of the reaction force of the coil spring 3 and the reaction force of the rubber 5 as shown by the line FG shown in FIG. It is difficult to make the shape complicated.

Further, the coil spring 3 alone has a problem that the internal friction is poor and the shock absorption is poor.
In addition, when trying to obtain a non-linear characteristic such as the line FG shown in FIG. 11 by expansion / contraction of the rubber 5, when the rubber 5 alone is expanded / contracted, a reaction line close to linear as in the coil spring 3 is generated. In order to draw, it is difficult to obtain a non-linear characteristic like the line FG shown in FIG.

  However, when the cylindrical rubber 5 as shown in FIG. 12 is inserted into the rubber insertion hole 8 having a cross-sectional shape as shown in FIG. 13, the rubber 5 expands and contracts as shown in FIGS. In the process, the rubber 5 comes into contact with the rubber insertion hole 8 to cause a phenomenon that deformation of the rubber 5 is restricted. Therefore, when the rubber 5 is deformed to a certain strain, a force greater than that of deforming the rubber 5 alone is required, and a phenomenon in which the apparent elastic coefficient changes occurs.

  Depending on the combination of the rubber 5 and the rubber insertion hole 8, the rubber reaction force line can be made non-linear as shown by a curve, and non-linear characteristics as shown by the line FG in FIG. 11 can be obtained. As a result, the sum of the reaction force of the coil spring and the reaction force of the rubber also has a non-linear characteristic. For example, in the process in which the cylindrical rubber 5 shown in FIG. 12 is inserted into the rubber insertion hole 8 having the cross-sectional shape shown in FIG. 13 and the rubber 5 is compressed, the rubber insertion hole tapered portion 8B provided on the side wall of the rubber insertion hole 8 is formed. When the rubber 5 comes into contact, the rubber 5 is restrained by the rubber insertion hole tapered portion 8B, and a large force is required to deform the rubber 5. As a result, it is possible to obtain a nonlinear reaction force curve like the line FG shown in FIG.

  Although it is possible to obtain a desired reaction force curve by combining the rubber shape and the shape of the rubber insertion hole as described above, the shape of the rubber insertion hole in which a taper is provided on a part of the side surface of the rubber insertion hole is It is difficult to measure, inspect and manage the dimensions of the tapered portion. On the other hand, it is possible to obtain a desired non-linear reaction force curve by using a plurality of rubbers having different elastic coefficients and shapes, but in any case, the shape of the rubber insertion hole is complicated as described above or a plurality of rubbers are used. In other words, dimensional management becomes complicated or the number of management items increases, which is a factor that hinders productivity. Further, depending on the shape of the rubber, local elastic deformation occurs and stress concentration is caused, so that durability becomes a problem.

  The present invention has been made in order to cope with the above-described problems. To obtain a desired reaction force curve, the shape of the rubber insertion hole is complicated, or the dimensional management is complicated by a combination of a plurality of rubbers. There are no factors that impede productivity, and the sum of the predetermined coil spring reaction force and rubber reaction force can be obtained as a non-linear characteristic by using a simple shape rubber insertion hole and a simple shape rubber. The present invention provides an electromagnetic brake device for an elevator hoisting machine that can suppress the elastic deformation and prevent stress concentration, and can reduce the impact sound during opening and braking operation without impairing durability. Objective.

  An electromagnetic brake device for an elevator hoist according to the present invention is wound around a fixed iron core disposed in a drum of an elevator hoist, and forms an electromagnet together with the fixed iron core. Armatures arranged opposite to each other, compression coil springs disposed between the fixed iron core and the armature, and applying a pressing force to the inner surface side of the drum on the armature, circular rubber formed on the opposed surface of the fixed iron core or the armature Inserted in the insertion hole, mounted on the back side of the armature with the fixed iron core and the armature when the armature is attracted by the electromagnet and the armature, and mounted on the back side of the armature with the electromagnet inoperative A brake shoe that is sometimes pressed against the inner surface of the drum by the compression coil spring; Is formed in a circular hole having a uniform diameter from the opposite surface to the bottom surface of the fixed iron core or armature, and the rubber is formed in a truncated cone shape with the bottom surface being the same size as the diameter of the rubber insertion hole. is there.

  Since the electromagnetic brake device for an elevator hoist according to the present invention is configured as described above, a linear reaction force line is drawn when the rubber is compressed alone, but it is inserted into the rubber insertion hole. When compressed, the inclined portion of the rubber side surface comes into contact with the side surface of the rubber insertion hole, and the rubber is restrained. Accordingly, since the force required to deform the rubber increases, the apparent elastic modulus increases, and as a result, the rubber reaction force line becomes non-linear, and the sum of the reaction force of the coil spring and the reaction force of the rubber is also non-linear. It is possible to draw a strong reaction force line.

  The shape of the rubber is a truncated cone shape having a bottom surface and a top surface that are flat, and is formed of a simple shape and one kind of rubber. Further, since the rubber insertion hole has a simple cylindrical counterbore shape having a uniform diameter in the depth direction, the size can be easily maintained and managed, and productivity is not hindered. In the process where the electromagnetic brake moves from the braking state to the released state, when the armature, the connecting member, and the brake shoe are separated from the inner surface of the drum, the sum of the reaction force of the coil spring and the reaction force of the rubber is sufficiently small with respect to the electromagnetic force. The armature, the connecting member, and the brake shoe are in a high speed, but immediately before the armature contacts the fixed iron core, the reaction force of the rubber increases rapidly, so that the speed is rapidly reduced.

  On the other hand, in the process where the electromagnetic brake moves from the open state to the braking state, the reaction force of the coil spring and the reaction force of the rubber are sufficiently large with respect to the electromagnetic force. Immediately before the shoe comes into contact with the inner surface of the drum, the difference between the sum of the electromagnetic force, the reaction force of the coil spring, and the reaction force of the rubber is reduced, so that the speed is rapidly reduced. As a result, it is possible to reduce the impact sound when the electromagnetic brake is released and braked.

  In addition, when a cylindrical rubber with the same top and bottom area is installed in a simple counterbore-shaped rubber insertion hole, the rubber diameter is the same as the rubber insertion hole. Since the rubber side surface and the side surface of the rubber insertion hole are already in contact with each other, it is difficult to draw a non-linear rubber reaction force line simply by increasing the force to deform the rubber. .

  Further, when the upper end portion of the rubber protrudes from the rubber insertion hole, only the protruding portion is deformed, and therefore there is a problem that the degree of stress concentration is increased by local elastic deformation. Furthermore, when the diameter of the conventional rubber is made smaller than the diameter of the rubber insertion hole, the rubber reaction force line can be drawn in a non-linear manner, but it is difficult to suppress the displacement during insertion, and the rubber reaction As a result, the variation of the line of force increases and the productivity is impaired.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of rubber used as a cushioning material in the electromagnetic brake device of the elevator hoist according to Embodiment 1, FIG. 2 is a side view showing the cross-sectional structure of the rubber shown in FIG. 1, and FIG. 4 is a cross-sectional side view showing a structure of a rubber insertion hole formed in the armature 4. FIG.

  As shown in FIGS. 1 and 2, the rubber 5 according to the first embodiment has a truncated cone shape in which the areas of the top surface and the bottom surface are different and the area of the bottom surface 5b is larger than the area of the top surface 5a. Further, a through-hole 5d is formed in the center in the vertical direction, and the center of the upper surface 5a and the center of the bottom surface 5b are concentric. Therefore, the side surface 5c of the rubber 5 is an axis extending from the upper surface 5a to the bottom surface 5b along the circumferential direction. It has a symmetrical, uniformly inclined cone shape.

  Further, as shown in FIG. 3, the rubber insertion hole 8 formed in the armature 4 has a simple counterbore shape with a uniform diameter from the end surface of the armature 4 toward the bottom surface of the hole. The diameter of the rubber insertion hole 8 is the same as the diameter of the bottom surface 5 b of the rubber 5. The rubber insertion hole 8 may be formed on the fixed iron core 1 side.

  FIG. 4 shows a state where the rubber 5 shown in FIGS. 1 and 2 is inserted into the rubber insertion hole 8 shown in FIG. Since the diameter of the bottom surface 5b of the rubber 5 and the diameter of the rubber insertion hole 8 are the same, it is possible to reduce the positional deviation during insertion. FIG. 5 shows a deformation in the process in which the upper surface of the rubber 5 is brought into contact with the fixed iron core 1 and the rubber 5 is compressed. The rubber 5 is deformed so that the side surface 5 c swells in the radial direction of the rubber 5 in the process of being compressed. As the deformation progresses, the side surface 5c of the rubber 5 comes into contact with the side surface 8C of the rubber insertion hole 8 and is restrained by the side surface 8C, so that the force required for the deformation of the rubber 5 increases rapidly thereafter. As a result, it was confirmed that the reaction force of the rubber was not linear but nonlinear, and a line FG as shown in FIG. 11 was obtained.

  In the first embodiment, a material is selected in which the elastic coefficient of the truncated cone-shaped rubber 5 is about 8% higher than that of the conventional rubber, and the area of the upper surface 5a is 90 to 95% of the area of the bottom surface 5b. It was confirmed that the non-linear FG shape as shown in FIG.

  As with the conventional shape shown in FIG. 12, the rubber 5 can be manufactured by the conventional manufacturing method because the shape of the first embodiment shown in FIGS. 1 and 2 can be handled by injection molding using a mold. I can do it. Further, since the rubber insertion hole 8 of the first embodiment is a simple counterbore hole as compared with the conventional rubber insertion hole shown in FIG. 13, in addition to easy dimensional control, the processing time can be shortened. confirmed.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to the drawings. 6 is a side sectional view showing a state in which the rubber in the second embodiment is inserted into the rubber insertion hole of the armature, and FIG. 7 is a side sectional view showing a state in which the upper surface of the rubber is pressed against the fixed iron core 1. . The difference from the first embodiment is that the volume of the rubber 5 is set to be larger than the volume of the rubber insertion hole 8 by utilizing the property that the volume of the rubber is kept constant against deformation. .

  As a result, when the upper surface of the rubber 5 is pressed against the fixed iron core 1, as shown in FIG. 7, the rubber 5 necessarily protrudes from the rubber insertion hole 8, and the armature 4 and the fixed iron core 1 are separated by the protruding portion 5e. The impact sound at the time of direct contact can be further reduced.

  In the second embodiment, as in the first embodiment, a material whose elastic coefficient of the rubber 5 is about 8% higher than that of the conventional rubber is selected, and the area of the upper surface 5a is made larger than the area of the bottom surface 5b. While setting to 90 to 95%, the height of the rubber 5 is increased by about 5% with respect to the first embodiment, and the volume of the rubber 5 is increased. As a result, it has been confirmed that the non-linear FG shape as shown in FIG. 11 exhibits an accurate characteristic, and the armature 4 and the fixed iron core 1 are not in direct contact by the protruding portion 5e. The impact sound is further reduced.

It is a perspective view which shows the structure in Embodiment 1 of the rubber | gum for buffer used for the electromagnetic brake device of the elevator hoist of this invention. It is a side view which shows the cross-section of the rubber | gum for buffer shown in FIG. FIG. 3 is a side view showing a cross-sectional structure of a rubber insertion hole of a buffer rubber formed in the armature in the first embodiment. FIG. 4 is a cross-sectional view showing a state where the cushioning rubber in the first embodiment is inserted into the rubber insertion hole shown in FIG. 3. It is sectional drawing which shows the state by which the rubber | gum for buffer shown in FIG. 4 was compressed. It is sectional drawing which shows the structure in Embodiment 2 of the buffer rubber used for the electromagnetic brake device of the elevator hoist of this invention, and the state inserted in the rubber insertion hole. It is sectional drawing which shows the state by which the rubber | gum for buffer shown in FIG. 6 was compressed. It is sectional drawing which shows the structure of the electromagnetic brake device of the elevator hoist, and its open state. It is sectional drawing which shows the structure of the electromagnetic brake device of the elevator hoist, and its braking operation state. It is explanatory drawing which shows the relationship between the force which acts on the gap between an armature and a fixed iron core, and an electromagnetic brake. It is explanatory drawing which shows the relationship between the force which acts on the electromagnetic brake required in order to reduce the impact noise and the gap between an armature and a fixed iron core. It is a perspective view which shows the structure of the rubber | gum for buffer used for the electromagnetic brake device of the conventional elevator hoist. It is a side view which shows the cross-sectional structure of the rubber insertion hole of the rubber | gum for buffering formed in an armature in the electromagnetic brake device of the conventional elevator hoist. It is sectional drawing which shows the state by which the rubber | gum for buffer used for the electromagnetic brake device of the conventional elevator hoist was inserted in the rubber insertion hole. It is sectional drawing which shows the state by which the rubber | gum for buffer shown in FIG. 14 was compressed.

Explanation of symbols

1 fixed iron core, 2 electromagnetic coil, 3 coil spring, 4 armature,
5 rubber, 5a rubber top surface, 5b rubber bottom surface, 5c rubber side surface,
5d rubber through-hole, 5e protruding part, 6 connecting member, 7 brake shoe, 8 rubber insertion hole, 8B taper part of rubber insertion hole, 8C side surface of rubber insertion hole,
9 Inner surface of the drum.

Claims (2)

  An electromagnetic coil wound around a fixed iron core arranged in a drum of an elevator hoist and forms an electromagnet together with the fixed iron core, an armature arranged opposite to the fixed iron core, and arranged between the fixed iron core and the armature Is inserted into a circular rubber insertion hole formed on the opposing surface of the compression coil spring, the fixed iron core or the armature that applies a pressing force to the inner surface side of the drum on the armature, and when the armature is attracted by the electromagnet A brake shoe that is mounted on the back side of the armature against the stationary iron core and is pressed against the inner surface of the drum by the compression coil spring when the electromagnet is not in operation. The rubber insertion hole extends from the opposite surface to the bottom surface of the fixed iron core or armature. It is formed in a circular hole having such diameter, the rubber bottom electromagnetic brake device for an elevator hoisting machine which is characterized in that it is formed in the shape of a truncated cone which is the same size and diameter of the rubber insertion hole.   2. The electromagnetic brake device for an elevator hoist according to claim 1, wherein the volume of the rubber is larger than the volume of the rubber insertion hole.

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