KR20130043641A - Brake release mechanism - Google Patents

Abstract

Provided is a brake release mechanism that can reduce the effort of brake release. The brake release mechanism includes a movable lever 13 and a fixed lever 15 provided so as to be relatively rotatable, and a plurality of rolling elements 17 provided therebetween. A plurality of support holes 19 are formed in one surface 13a of the pair of surfaces facing each other in the lever, and a plurality of long holes 21 extending in an arc shape so that the rolling elements can move while rolling on the other surface 15a. ) Is formed. The long hole is formed so that the receiving depth of the rolling element changes when the rolling element moves along the long hole, respectively. The distance in the direction of the relative rotation axis of both levers is changed by the relative rotation of those levers. The brake release mechanism further includes a release bolt 43 for restraining the position in the direction of the relative rotation axis of the fixed lever, without restraining the position in the direction of the relative rotation axis of the movable lever. By rotating the movable lever, the fixed lever gives the movable body a moving force in the relative rotation axis direction, and the brake is released.

Description

Brake Release Mechanism {BRAKE RELEASE MECHANISM}

The present invention relates to a brake release mechanism for a hoist brake of an elevator.

The hoist of the elevator is provided with a brake for stopping the elevator car. The brake is provided with an electromagnetic coil. During normal operation in which the elevator car is lifted and lowered, the brake is energized by the electromagnetic coil, and the brake for the hoist is released by the electronic action. On the other hand, the power was cut off during an emergency such as a power failure or an earthquake, and the brake was automatically configured to be in a braking state. Therefore, as an operation after the elevator car emergencyly stopped, the brake for the hoisting machine was manually released, and the elevator car was moved to the nearest floor after the elevator car was able to be lifted.

There is a structure disclosed in Patent Document 1 as manually releasing the brake for a hoist in the above scene. In such a structure, a pin penetrates through a movable iron core constituting a brake, and the tip of the pin is screwed into a fixed iron core having an electromagnetic magnet, and the head of the pin has a fixed iron core in the movable iron core. Protrudes to the other side. When releasing the brake, the wedge-shaped portion of the brake release tool is inserted between the head of the pin and the movable iron core, and the movable shoe core is moved to the fixed iron side so that the brake shoe supported by the movable iron core is separated from the brake surface of the rotor. It was to be (離 隔).

However, in the brake release mode using the wedge effect as described above, when the wedge-shaped portion is inserted between the head of the pin and the movable core, the brake release tool is large due to extensive surface contact in the wedge-shaped portion. Because of the frictional force, a great deal of effort was required to release the brakes.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2006-341942

This invention is made | formed in view of the above, and an object of this invention is to provide the brake release mechanism which can reduce effort in manual brake release operation.

In order to achieve the above object, the present invention is a brake release mechanism for a hoist brake of an elevator comprising a movable base for supporting a brake shoe and a fixed base having an electromagnetic coil for driving the movable body. A pair of faces provided with the 1st member and the 2nd member which were possibly provided, and the some rolling element provided between the said 1st member and the 2nd member, and faced each other in the said 1st member and the 2nd member. One side is formed with a plurality of support holes for partially accommodating the rolling element, and the other side is formed with a plurality of long holes extending in an arc shape so that the rolling element can move while rolling, and each of the supporting holes is the rolling element. Is supported so as to be rotatable and movable in synchronism with the support hole, wherein the long hole is provided by the rolling element, respectively. Therefore, when it moves, it is formed so that the receiving depth of this rolling element may change, and the said rolling element is accommodated in both the said support hole and the said long hole respectively between the said 1st member and the 2nd member, and thereby The distance between the first and second members in the relative rotation axis direction is changed by the relative rotation of the first and second members, and the position in the relative rotation axis direction of one of the first and second members is changed. And a restraining portion for restraining a position in the direction of the other relative rotation axis without restraining, wherein the restraining portion is fixed to the fixed base, and one of the first member and the second member has a relative rotation shaft to the movable body. It is provided so that the movement force of a direction may be provided.

According to the brake release mechanism of the present invention, the effort can be reduced in the manual brake release operation.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the expansion drum brake for elevator hoisters to which the brake release mechanism which concerns on embodiment of this invention is applied.
2 is a view showing a state in which a movable lever and a fixed lever constituting the brake release mechanism are combined.
3 is a view showing a state seen from arrow III of FIG. 2.
4 is a cross-sectional view taken along line IV-IV of FIG. 3.
5 is a plan view of the movable lever.
6 is a cross-sectional view taken along the line VI-VI of FIG. 5.
7 is a plan view of the fixing lever.
FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7, showing an arc-shaped area taken along the line VIII-VIII in a planar shape. FIG.
FIG. 9 is an enlarged view of a vicinity of one collar with respect to FIG. 2.
Fig. 10 is a view of the same type as in Fig. 1 with the brake release mechanism assembled to the hoisting brake.
FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10.
FIG. 12 is a diagram illustrating a plane taken along a line XII-XII of FIG. 10.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the brake release mechanism which concerns on this invention is described based on an accompanying drawing. In addition, in the figure, the same code | symbol shall represent the same or corresponding part.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram of the expansion drum brake for elevator hoisters to which the brake release mechanism which concerns on this embodiment is applied. The hoist brake 1 includes a pair of movable bodies 3 and a fixed base 5.

The pair of movable bodies 3 are provided on both sides of the fixed base 5 so as to sandwich the fixed base 5. Each movable body 3 is provided with the projection 3a which the fixed lever mentioned later engages and stops. The brake shoe 9 is provided on the opposite side to the fixed base 5 in each movable body 3 so as to oppose the inner peripheral surface of the rotor 7. Each brake shoe 9 is supported by the corresponding movable body 3. An elastic body 11 is disposed between each movable body 3 and the fixed base 5. Thereby, the pair of movable bodies 3 and the pair of brake shoes 9 are always pressed toward the rotor 7 by the elastic force of the corresponding elastic body 11.

The fixed base 5 has an electromagnetic coil not shown in the vicinity of the pair of movable bodies 3. The pair of movable bodies 3 are driven by these electromagnetic coils. Specifically, when the pair of movable bodies 3 are energized by these electromagnetic coils, the pair of movable bodies 3 receive a driving force drawn to the fixed base 5 side by the electromagnetic force.

Next, the brake release mechanism according to the present embodiment will be described. 2 is a view showing a state in which a movable lever and a fixed lever constituting the brake release mechanism are combined. FIG. 3 is a view showing a state seen from arrow III of FIG. 2, and FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3. First, the brake release mechanism includes a movable lever (first member) 13, a fixed lever (second member) 15, and a plurality of rolling elements 17.

The movable lever 13 and the fixed lever 15 are provided so as to be relatively rotatable with each other. In addition, a plurality of rolling elements 17 (three in the present embodiment) are provided between the movable lever 13 and the fixed lever 15. In the present embodiment, for example, a sphere of a bearing steel material ( It is comprised as a ball. On one surface 13a of the pair of surfaces 13a and 15a facing each other on the movable lever 13 and the fixed lever 15, the same number (three in this embodiment) of the support holes 19 as the rolling elements The other surface 15a is provided with the same length (21 in this embodiment) of the long holes 21 in the other surface 15a. These will be described with reference to still another drawing.

5 is a plan view of the movable lever, and FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 5. 7 is a plan view of the fixing lever. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 7, but an arc-shaped area along the line VIII-VIII is developed in a planar shape.

First, as shown in FIG. 5, the movable lever 13 has a body portion 23 and a lever piece portion 25. The body part 23 is a circular disk-shaped part centered on the rotating shaft CL regarding the above-mentioned relative rotation. The through hole 27 is formed in the center of the body part 23. The lever piece portion 25 is a portion extending in the radial direction with respect to the relative rotation, and specifically in this embodiment, the portion extending from the body portion 23 to the radially outer side of the body portion 23.

Each of the support holes 19 is a pool opening in the above-mentioned one surface 13a of the body portion 23. Each of the supporting holes 19 has a form in which the rolling elements 17 are partially accommodated. As an example, the shape mimics the outer shape of the rolling elements 17 (inner surface shape similar to that of the rolling elements). Have Specifically, in this embodiment, since each rolling element 17 is a sphere, the inner surface shape of the support hole 19 is formed in spherical shape. Moreover, as shown in FIG. 6, the depth of each support hole 19 is set to half (d / 2) of the diameter d of the sphere which comprises the rolling element 17. As shown in FIG. As mentioned above, in this embodiment, each support hole 19 is a hemispherical pool. Moreover, from such a form of the support hole 19, each support hole 19 is a form which can not move the corresponding rolling element 17 in a hole, but can rotate in a hole, In other words, a support hole Support in a form that can move and rotate synchronously.

The three support holes 19 are arranged on the circumference of a single radius with respect to the center (relative rotation axis CL) of the body portion 23 in plan view. In addition, each of the support holes 19 is spaced apart from each other adjacent support holes 19 at an equiangular interval (120 degrees in the present embodiment).

On the other hand, as shown in FIG. 7, the fixed lever 15 has a body portion 29 and a fixing arm portion 31. The body portion 29 is a circular disk-shaped portion centered on the relative rotation shaft CL. The through hole 33 is formed in the center of the body portion 29.

The fixing arm 31 is a portion extending in the radial direction with respect to the relative rotation, and in this embodiment, specifically, the portion extending from the body portion 29 to the radially outer side of the body portion 29. A pair of hooks 35 are provided in the vicinity of the distal end of the fixing arm 31. As long as the pair of hooks 35 stand up from the surface on the side opposite to the other surface 15a described above in which the long hole 21 is formed, that is, the surface facing the movable body 3 when assembled. It is a pair of protrusions. And when performing brake release by manual, the above-mentioned protrusion 3a in the movable body 3 is inserted between the pair of hooks 35. As shown in FIG.

Each of the long holes 21 is a pool opening on the other surface 15a described above in the body portion 29. Each of the long holes 21 has a shape in which the rolling element 17 is partially accommodated, and each of the long holes 21 extends in an arc shape with respect to the relative rotation shaft CL. Moreover, as shown in FIG. 7, each elongate hole 21 is provided with the shape which forms the trajectory at the time of moving a circle in circular arc shape by planar view. In addition, the inner surface shape of each elongate hole 21 has the shape corresponding to the external shape of the rolling element 17. Specifically, in this embodiment, as shown in FIG. 8, the spherical surface was moved to circular arc shape. It has a shape that forms the trajectory of time. Moreover, as shown in FIG. 8, the depth of each elongate hole 21 changes with the position of the arc-shaped extension direction, In other words, the elongate hole 21 is a hole whose rolling element 17 has an elongate ( It is formed so that the receiving depth of the rolling element 17 may change when it moves along 21). In this embodiment, the relationship between the maximum depth Xmax of each long hole 21, and the minimum depth Xmin which changes substantially linearly from the depth is with respect to the diameter d of the rolling element 17,

0 <Xmin <Xmax <d / 2

It is. From this form of the long hole 21, each rolling element 17 can move along the extension direction of the long hole 21, rolling the corresponding long hole 21, and the rolling element 17 The receiving depth (in other words, the exposure height from the long hole 21 of the rolling element 17) changes with the movement of the rolling element 17.

The three long holes 21 are arranged on the circumference of a single radius with respect to the center (relative rotation axis CL) of the body portion 29 in plan view. Further, each of the long holes 21 is spaced apart from each other by the adjacent long holes 21 at an equiangular interval (almost 120 degrees in the present embodiment in the circumferential center of the long holes).

Each rolling element 17 is partially accommodated in the support hole 19 of the structure mentioned above from one side, and is partially accommodated in the elongate hole 21 of the structure mentioned above from the other side. That is, the rolling element 17 is accommodated in both the corresponding support hole 19 and the long hole 21 between the movable body 3 and the fixed base 5, respectively. Accordingly, the distance between the movable body 3 and the fixed base 5 in the direction of the relative rotation shaft CL depends on the relative rotational operation between the movable body 3 and the fixed base 5, that is, the rolling element 17 is moved. It changes according to which position in the long hole 21 it is.

The brake release mechanism according to the present embodiment further includes a cover member and a plurality of collars. These are demonstrated based on FIG. 2 and FIG. 9 is an enlarged view of the vicinity of one collar with respect to FIG. 2. As shown in FIG.2 and FIG.9, the cover member 37 is arrange | positioned so that the movable lever 13 may be clamped between the fixed lever 15. As shown in FIG. Moreover, the collar 39 is a cylindrical member, respectively, and is disposed between the cover member 37 and the fixed lever 15 to maintain a gap between the cover member 37 and the fixed lever 15. The collar screw 41 is inserted through the hollow part of each collar 39, and the cover member 37 and the fixing lever 15 are connected by these collar screws 41.

The brake release mechanism further includes a restraining portion. The restraining part restrains the position in the direction of the other relative rotation shaft CL without restraining the position in the direction of the relative rotation shaft CL relative to one of the movable lever 13 and the fixed lever 15, for example. . In this embodiment, the restraint part is comprised with the release bolt fixed to the fixed base 5. This will be described based on FIGS. 10 and 11.

Fig. 10 is a view of the same type as in Fig. 1 with the brake release mechanism assembled to the hoisting brake. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 10. As best shown in Fig. 11, the release bolt 43, which is the restraining portion, penetrates the movable lever 13 and the fixed lever 15 so as to extend on the relative rotation shaft CL, i.e., the above-mentioned through hole ( 27) and through-hole 33 are passed. The tip of the release bolt 43 is screwed to the fixed base 5. The head of the release bolt 43 has a larger outer diameter than the through hole 27 and is exposed to the opposite surface 13b to the one surface 13a on which the support hole 19 in the movable lever 13 is formed. It hangs on the surface 13b. Further, in the vicinity of the relative rotation shaft CL in the cover member 37, a hole for releasing the head is provided so that the head of the release bolt 43 is not prevented from being caught by the opposite surface 13b. .

Next, the action of the brake release mechanism according to the present embodiment will be mainly described based on FIGS. 10 to 12. FIG. 12 is a diagram illustrating a plane taken along a line XII-XII of FIG. 10. In the brake release mechanism, as shown in FIGS. 10 and 11, the movable lever 13 and the fixed lever 15 are arranged on the side opposite to the fixed base 5 in the movable body 3. Moreover, the movable lever 13 and the fixed lever 15 are arrange | positioned in the relationship which the fixed lever 15 is located in the movable body 3 side. 10 to 12, the projection 3a of the movable body 3 is inserted between the pair of hooks 35 of the fixed lever 15. The rolling elements 17 are each located at a part of the maximum depth Xmax in the corresponding long hole 21. As an example of the mounting procedure, first, the pair of hooks 35 of the fixed lever 15 are engaged with the projection 3a of the movable body 3, and then the release bolt 43 is passed through the through hole 27. And the through-hole 33 are inserted into the fixing base 5 so that the head of the releasing bolt 43 abuts against the opposite surface 13b of the movable lever 13.

From the above state, when the movable lever 13 is rotated as indicated by the arrow R in FIG. 12, the fixed lever 15 is moved by the movable body 3 due to the engagement between the hook 35 and the protrusion 3a. Rotation in the relative rotational direction is constrained, and eventually, the fixed lever 15 does not rotate but only the movable lever 13 rotates. Therefore, relative rotation occurs between the movable lever 13 and the fixed lever 15.

When relative rotation occurs between the movable lever 13 and the fixed lever 15, each of the rolling elements 17 is due to the arc-shaped movement of the support hole 19 in the rotating lever 13, The position is changed synchronously (together) with the support hole 19, and it moves to the part of minimum depth Xmin, rolling the long hole 21 inside. In this way, the rolling element 17 moves from the portion of the maximum depth Xmax in the long hole 21 to the portion of the minimum depth Xmin, thereby exposing the rolling element exposed from the other surface 15a of the fixed lever 15. The height of 17 increases and the distance between the other surface 15a of the fixed lever 15 and one surface 13a of the movable lever 13, and eventually, the distance between the fixed lever 15 and the movable lever 13 This increases. Here, the movable lever 13 is allowed relative rotation, but the movement in the direction of the relative rotation axis CL (particularly in the direction away from the fixed base 5) is limited by the release bolt 43. have. For this reason, the increase in the space | interval of the movable lever 13 and the fixed lever 15 is shown as a movement in the direction of the relative rotation axis CL of the direction from which the fixed lever 15 moves away from the movable lever 13. Therefore, the movable body 3 receives the pressing force in the direction of the relative rotation shaft CL from the fixed lever 15, resists the elastic force of the elastic body 11, and moves to approach the fixed base 5. Thereby, the brake shoe 9 integrally provided with the movable body 3 is spaced apart from the inner peripheral surface of the rotor 7, and release of a brake by manual is achieved.

In addition, relative operation between the movable lever 13 and the fixed lever 15 is appropriately secured by making the collar 39 have the following form. As shown in FIG. 9, the height X of the collar 39 sets the depth of the support hole 19 of the movable lever 13 to a, and the thickness of the movable lever 13 to b, When the moving distance of the required movable body 3 is g,

g + d-Xmin-a <X <(d-Xmax) + b-(d / 2)

It is appropriate to set to satisfy. By setting the height of the collar 39 to X that satisfies the above conditions, the interval can be changed so that the movable lever 13 and the fixed lever 15 do not interfere during the brake release operation, and the movable lever 13 And the rolling element 17 sandwiched between them can be prevented from falling even in a state where the distance between the fixing lever 15 and the fixing lever 15 is maximized.

As explained above, according to the brake release mechanism which concerns on this embodiment, when giving a brake release force to a movable body, it finishes without generating large frictional force by extensive surface contact. More specifically, the friction by the rotation of the movable lever can be absorbed by the rotation of the rolling element itself. As a result, the effort of the manual brake release operation can be greatly reduced. In addition, since the brake can be forcibly released by applying only the rotational force in the longitudinal direction with respect to the hoisting machine, it is not necessary to provide a large space for the release operation on the side of the hoisting machine and can be connected to the space saving of the hoistway or machine room.

As mentioned above, although the content of this invention was concretely demonstrated with reference to preferable embodiment, it is clear for those skilled in the art to acquire various modified forms based on the basic technical idea and teaching of this invention.

As an example, the restraining portion does not restrain the position in the relative rotation shaft CL direction with respect to one of the movable lever (first member) and the fixed lever (second member), and the position in the other relative rotation shaft CL direction. It is sufficient to provide a restraining action. Therefore, the restraining portion is not limited to being an independent single member as in the above embodiment as long as it can provide such an action, and is part of the first member or the second member, part of the fixed base, or part of the other elements. May or may be.

3 movable body, 5 fixed base,
9 brake shoes,
13 movable lever (the other of the first member, the first member and the second member),
One side 13a, the other side 13b,
15 fixed lever (one of the second member, the first member and the second member),
15a other side, 17 rolling elements,
19 support holes, 21 long holes,
37 cover member, 39 collars,
43 Release bolt (restraint part), CL relative rotation shaft.

Claims (8)

A brake release mechanism for a hoist brake of an elevator comprising a movable base for supporting a brake shoe and a fixed base having an electromagnetic coil for driving the movable body,
A first member and a second member provided to be relatively rotatable,
A plurality of rolling elements provided between the first member and the second member,
One surface of the pair of surfaces facing each other in the first member and the second member is formed with a plurality of support holes for partially accommodating the rolling elements, and in the other surface in a circular arc shape so that the rolling elements can move while rolling. A plurality of elongated holes are formed,
The support holes respectively support the rolling element so as to be rotatable and move in synchronization with the support holes.
The long holes are formed such that the receiving depth of the rolling elements changes when the rolling elements move along the long holes, respectively.
The rolling elements are respectively accommodated in both the corresponding supporting holes and the elongated holes between the first member and the second member, whereby the distance in the relative rotation axis direction of the first member and the second member is By changing by the relative rotation of this 1st member and a 2nd member,
Further comprising a restraining portion for restraining the position in the other relative rotation axis direction of the first member and the second member, without restraining the position in the relative rotation axis direction,
The restraint portion is fixed to the fixed base,
The brake release mechanism of the said 1st member and the 2nd member provided so that the said moving body may provide the movement force of a relative rotation axis direction to the said movable body. The method according to claim 1,
Rotation of the said one of the said 1st member and the 2nd member in the relative rotation direction is restrained by the said movable body,
The said long hole is a brake release mechanism provided in the said one of the said 1st member and the 2nd member. The method according to claim 1 or 2,
The other one of the said 1st member and the 2nd member has the lever piece part extended radially about relative rotation,
The support hole is a brake release mechanism formed in the other of the first member and the second member. 4. The method according to any one of claims 1 to 3,
And said rolling elements are spheres, respectively. The method of claim 4,
At least three spheres are provided,
And each of the support holes is spaced apart at equal angles from the support holes adjacent to each other. 6. The method according to any one of claims 1 to 5,
The said 1st member and the 2nd member are such that the said one is located in the said movable body side, and is a brake release mechanism arrange | positioned on the opposite side to the said fixed base in this movable body. 7. The method according to any one of claims 1 to 6,
And a cover member and a collar,
The cover member is arranged to sandwich the other between the first member and the one side in the second member,
And said collar is disposed between said cover member and said one of said first and second members, and maintains a gap between said cover member and said one. The method according to any one of claims 1 to 7,
The restraining portion penetrates through the first member and the second member so as to extend on the relative rotation axis;
The tip of the restraint portion is screwed to the fixed base,
The head of the restraint portion is exposed to an opposite surface to one surface of the first member and the second member on which the support hole or the elongated hole is formed, and is hung on the opposite surface.

Images